Source: https://guthlabs.ai/docs/instruments/ instrument-catalog / verified-ledger # Verified instrument catalog This September 2026 snapshot records 929 subject-area slots. The accompanying ledger export contains 928 rows and 926 unique names. The source reviewed here does not establish why the slot and row totals differ, so 926 unique names is the stable public browse count for this snapshot. Status: **observed**Lifecycle: **verified-ledger** **Educational catalog.** Instrument pages, including health and pharmacology topics, are informational and nonclinical. They do not provide diagnosis, treatment, or professional advice. ## Snapshot scope The 929-slot and 928-row figures describe different source measures in this frozen snapshot; they should not be treated as the same count. The browsable catalog resolves to 926 unique names. ## Unique-name state At the unique-name level, 826 are verified clean, 98 are verified with binding errata, and 2 live-data instruments are held as unverifiable offline. The held instruments require visible feed provenance before shipping. ## Hardening evidence Three independent stress angles produced 2,787 requests. Five genuine computational defects were found, independently checked, and corrected. A separate boundary catalog retains 845 slot-level input and convention hazards for implementation hardening. ## Browse The generated catalog below is grouped by subject area. Every instrument has four distinct records for overview, mechanism, implementation, and qualification. They preserve lifecycle state, review findings, assumptions, hazards, errata, workflow memberships, and evidence pointers without pretending that documentation is a deployed calculator. ## Search the catalog INSTRUMENT SEARCH 926 instruments ## Audio, Music, Photography & Color 64 [Absorption/Reflection Coefficient Lookup (Acoustic Materials)VERIFIED CLEAN]()[Aspect Ratio / Crop CalculatorVERIFIED CLEAN]()[Audio File Size EstimatorVERIFIED CLEAN]()[Beat/Measure Duration & Song Length EstimatorVERIFIED CLEAN]()[Bit Depth Dynamic Range CalculatorVERIFIED CLEAN]()[Bit Rate ↔ File Size for Audio Codecs (MP3/AAC/FLAC estimate)VERIFIED CLEAN]()[Blackbody Color Temperature → RGB ApproximationVERIFIED CLEAN]()[BPM Tap TempoVERIFIED CLEAN]()[Cents / Pitch Deviation CalculatorVERIFIED CLEAN]()[Chord Progression / Roman Numeral AnalyzerVERIFIED CLEAN]()[Color Temperature Mired Shift CalculatorVERIFIED CLEAN]()[Comb Filtering / Phase Cancellation PredictorVERIFIED CLEAN]()[Complementary / Analogous / Triadic Color Scheme GeneratorVERIFIED CLEAN]()[Data Rate / Storage Planner (Camera Codecs)VERIFIED CLEAN]()[dB SPL / dBu / dBV ConverterVERIFIED CLEAN]()[Delay Time from BPM (Musical Note Divisions)VERIFIED CLEAN]()[Depth of Field / Hyperfocal Distance CalculatorVERIFIED CLEAN]()[Diffraction Limit / Optimal Aperture CalculatorVERIFIED CLEAN]()[Exposure Bracketing / HDR Stops PlannerVERIFIED CLEAN]()[Exposure Triangle / EV CalculatorVERIFIED CLEAN]()[Exposure Value (EV) to Lux/Foot-candle ConverterVERIFIED CLEAN]()[Field of View Calculator (Sensor + Focal Length)VERIFIED CLEAN]()[Flash Guide Number CalculatorVERIFIED CLEAN]()[Focal Length Equivalent / Crop Factor ConverterVERIFIED CLEAN]()[Frame Rate Conversion / Pulldown CalculatorVERIFIED CLEAN]()[Gain Staging / dB Sum CalculatorVERIFIED CLEAN]()[Gamut Coverage / Color Space Notes PanelVERIFIED CLEAN]()[Golden Hour / Sun Position CalculatorVERIFIED WITH ERRATA]()[Guitar Capo ChartVERIFIED CLEAN]()[Harmonic Series ExplorerVERIFIED CLEAN]()[Hex ↔ RGB ↔ HSL ↔ LAB Color ConverterVERIFIED CLEAN]()[Interval / Chord / Scale Reference BuilderVERIFIED CLEAN]()[Latency / Buffer Size CalculatorVERIFIED CLEAN]()[Loudness Unit (LUFS) Reference / Target CheckerVERIFIED CLEAN]()[Metronome Click Track Export (Tempo Map)VERIFIED CLEAN]()[Metronome PanelVERIFIED CLEAN]()[Microphone Polar Pattern / Proximity Effect ReferenceVERIFIED CLEAN]()[MIDI Note Number ↔ Note Name ConverterVERIFIED CLEAN]()[Motion Blur / Panning Shutter Speed EstimatorVERIFIED WITH ERRATA]()[ND Filter Stop / Exposure Time CalculatorVERIFIED CLEAN]()[Note Frequency Reference (A4 Tuning Offset)VERIFIED CLEAN]()[Pan Law / Stereo Balance Level CalculatorVERIFIED CLEAN]()[Panorama Stitching Field-of-View PlannerVERIFIED CLEAN]()[Passive Crossover Frequency CalculatorVERIFIED CLEAN]()[Print DPI / Size CalculatorVERIFIED CLEAN]()[Print vs Screen Color Gamut Warning (Simplified)VERIFIED CLEAN]()[Reciprocity Failure Calculator (Film)VERIFIED CLEAN]()[Reverb Time RT60 (Sabine Formula)VERIFIED CLEAN]()[Room Modes Calculator (Axial)VERIFIED CLEAN]()[Safe Area / Title-Safe Overlay CalculatorVERIFIED CLEAN]()[Sample Rate / Nyquist Frequency CheckerVERIFIED CLEAN]()[Semitone/Cents Ratio ↔ Playback Speed (Pitch/Time) CalculatorVERIFIED CLEAN]()[Sound Level Distance Attenuation (Inverse Square Law)VERIFIED CLEAN]()[Speaker Impedance Load Calculator (Series/Parallel)VERIFIED CLEAN]()[Star Trail / Astro Exposure (500 Rule / NPF Rule)VERIFIED CLEAN]()[String/Wind Instrument Fundamental Frequency (String Length)VERIFIED CLEAN]()[Sunny 16 / Exposure Rule-of-Thumb PanelVERIFIED CLEAN]()[Tempo ↔ Milliseconds ConverterVERIFIED CLEAN]()[Time-Lapse Interval CalculatorVERIFIED CLEAN]()[Timecode Math CalculatorVERIFIED CLEAN]()[Transposition CalculatorVERIFIED CLEAN]()[Video Bitrate / File Size CalculatorVERIFIED CLEAN]()[Wavelength ↔ Frequency (Sound) ConverterVERIFIED CLEAN]()[WCAG Contrast Ratio CheckerVERIFIED CLEAN]() ## Biology, Medicine & Health 1 [BMI CalculatorVERIFIED CLEAN]() ## Biology, Medicine & Pharmacology 5 [BMR/TDEE (Mifflin-St Jeor)VERIFIED CLEAN]()[Body Fat % (BMI-based, Deurenberg)VERIFIED CLEAN]()[Body Fat % Estimator (US Navy method)VERIFIED CLEAN]()[Body Surface Area (Du Bois)VERIFIED WITH ERRATA]()[Harris-Benedict BMR (legacy)VERIFIED CLEAN]() ## Biology, Medicine & Pharmacology (educational estimates only — every panel labeled not-medical-advice) 82 [A1C to Estimated Average Glucose ConverterVERIFIED CLEAN]()[Absorbance-to-Concentration (Beer-Lambert)VERIFIED CLEAN]()[Adult Growth Chart / Height PercentileVERIFIED CLEAN]()[Alcohol Unit / Standard Drink CounterVERIFIED CLEAN]()[Allele/Genotype Frequency from Pedigree CountsVERIFIED CLEAN]()[Anion Gap CalculatorVERIFIED CLEAN]()[Antibiotic Dilution / MIC Reference Calculator (education)VERIFIED CLEAN]()[Apgar Score Reference SheetVERIFIED CLEAN]()[Basal Insulin / Carb Ratio Reference (education)VERIFIED CLEAN]()[Basal Metabolic Rate → Weight Change ProjectorVERIFIED CLEAN]()[Bilirubin/Jaundice Risk Reference (education)VERIFIED CLEAN]()[Blood Alcohol Concentration (Widmark estimate)VERIFIED CLEAN]()[Blood Type / Transfusion Compatibility ReferenceVERIFIED CLEAN]()[Caffeine Half-Life / Level TrackerVERIFIED CLEAN]()[Caloric Content / Macronutrient CalculatorVERIFIED CLEAN]()[Cardiac Output & Related HemodynamicsVERIFIED CLEAN]()[Cell Counting / Hemocytometer CalculatorVERIFIED CLEAN]()[Cell/Bacterial Doubling Time CalculatorVERIFIED CLEAN]()[Chi-Square Goodness-of-Fit (Genetics)VERIFIED CLEAN]()[Circadian Phase / Jet Lag Adjustment EstimatorVERIFIED CLEAN]()[Codon/DNA-RNA-Protein TranslatorVERIFIED CLEAN]()[Corrected Calcium / Sodium CalculatorVERIFIED CLEAN]()[Creatinine Clearance (Cockcroft-Gault)VERIFIED CLEAN]()[Culture Media / Buffer Recipe ScalerVERIFIED CLEAN]()[Diffusion Time / Fick's Law Estimator (biological scale)VERIFIED CLEAN]()[DNA/RNA/Protein Molecular Weight CalculatorVERIFIED CLEAN]()[Drug Half-Life Accumulation / EliminationVERIFIED CLEAN]()[eGFR (CKD-EPI 2021, race-free)VERIFIED CLEAN]()[eGFR (MDRD, legacy)VERIFIED CLEAN]()[Enzyme Inhibition Type ComparatorVERIFIED CLEAN]()[Enzyme Kinetics (Michaelis-Menten) SolverVERIFIED CLEAN]()[Framingham-style Cardiovascular Risk Score (education)VERIFIED CLEAN]()[GC Content & Sequence Composition AnalyzerVERIFIED CLEAN]()[Genetic Linkage / Recombination Frequency CalculatorVERIFIED CLEAN]()[Gestational Age / EDD from UltrasoundVERIFIED CLEAN]()[Glycemic Load CalculatorVERIFIED CLEAN]()[Hardy-Weinberg Equilibrium CalculatorVERIFIED CLEAN]()[HOMA-IR Insulin Resistance Index (education)VERIFIED CLEAN]()[Ideal/Adjusted Body WeightVERIFIED CLEAN]()[IV Drip Rate CalculatorVERIFIED CLEAN]()[Kaplan-Meier Survival Curve PlotterVERIFIED CLEAN]()[Life Table / Survival Probability CalculatorVERIFIED CLEAN]()[Loading & Maintenance Dose CalculatorVERIFIED CLEAN]()[Lung Capacity Predicted Values (Spirometry Reference)VERIFIED CLEAN]()[Mean Arterial Pressure & Pulse PressureVERIFIED CLEAN]()[Menstrual Cycle Length Tracker/PredictorVERIFIED CLEAN]()[Metabolic Equivalent (MET) / Activity Energy CalculatorVERIFIED CLEAN]()[Mid-Parental Height PredictorVERIFIED CLEAN]()[Molarity / Solution Prep CalculatorVERIFIED CLEAN]()[ng-to-pmol / Copy Number ConverterVERIFIED CLEAN]()[NNT/NNH (Number Needed to Treat/Harm)VERIFIED CLEAN]()[One-Compartment PK Simulator (first-order)VERIFIED WITH ERRATA]()[Osmolarity / Tonicity CalculatorVERIFIED CLEAN]()[Osmotic Pressure Calculator (van't Hoff)VERIFIED CLEAN]()[Ovulation & Fertile Window EstimatorVERIFIED CLEAN]()[PCR Cycle / Amplification CalculatorVERIFIED CLEAN]()[Pediatric Growth Percentile LookupVERIFIED CLEAN]()[Percent Solution / Concentration Unit ConverterVERIFIED CLEAN]()[pH / Henderson-Hasselbalch CalculatorVERIFIED CLEAN]()[Population Growth: Exponential ModelVERIFIED CLEAN]()[Population Growth: Logistic ModelVERIFIED CLEAN]()[Pregnancy Due Date CalculatorVERIFIED CLEAN]()[Primer Melting Temperature (Tm) CalculatorVERIFIED CLEAN]()[Protein Concentration (BCA/Bradford standard curve)VERIFIED WITH ERRATA]()[Protein Requirement EstimatorVERIFIED CLEAN]()[Punnett Square GeneratorVERIFIED CLEAN]()[Punnett-based Trihybrid/Multi-gene Probability CalculatorVERIFIED WITH ERRATA]()[Punnett-derived Carrier Risk Calculator (education)VERIFIED CLEAN]()[QTc Interval Calculator (education)VERIFIED CLEAN]()[Relative Risk / Odds Ratio CalculatorVERIFIED WITH ERRATA]()[Restriction Enzyme Cut Site FinderVERIFIED CLEAN]()[Reynolds Number for Blood Flow (biofluid mechanics)VERIFIED CLEAN]()[Sample Size / Power Calculator (clinical study education)VERIFIED CLEAN]()[Sensitivity/Specificity/PPV/NPV CalculatorVERIFIED CLEAN]()[Serial Dilution CalculatorVERIFIED CLEAN]()[Smoking Pack-Year CalculatorVERIFIED CLEAN]()[Target Heart Rate ZonesVERIFIED CLEAN]()[Titration Curve Simulator (weak acid/base biochem context)VERIFIED CLEAN]()[VO2max Estimator (non-exercise / walk test)VERIFIED CLEAN]()[Waist-to-Hip / Waist-to-Height RatioVERIFIED CLEAN]()[Water Intake / Hydration EstimatorVERIFIED CLEAN]()[Weight-Based Dosage Calculator (education)VERIFIED CLEAN]() ## Chemistry & Materials 66 [Alloy Density Rule-of-Mixtures CalculatorVERIFIED CLEAN]()[Arrhenius Equation CalculatorVERIFIED WITH ERRATA]()[Arrhenius Plot (ln k vs 1/T) ToolVERIFIED WITH ERRATA]()[Beer–Lambert Law (Absorbance) CalculatorVERIFIED CLEAN]()[Bond Enthalpy Reaction EstimatorVERIFIED CLEAN]()[Buffer Capacity EstimatorVERIFIED CLEAN]()[Buffer Preparation CalculatorVERIFIED WITH ERRATA]()[Calorimetry Calculator (q=mcΔT)VERIFIED CLEAN]()[Chemistry Unit & Constants ConverterVERIFIED CLEAN]()[Colligative Properties SuiteVERIFIED CLEAN]()[Combined/Combined-Gas-Law CalculatorVERIFIED CLEAN]()[Combustion Analysis SolverVERIFIED WITH ERRATA]()[Dalton's Law / Partial Pressure CalculatorVERIFIED CLEAN]()[Dilution Calculator (C1V1=C2V2)VERIFIED CLEAN]()[Electronegativity Difference / Bond Type PredictorVERIFIED CLEAN]()[Empirical & Molecular Formula FinderVERIFIED CLEAN]()[Faraday's Law Electrolysis CalculatorVERIFIED CLEAN]()[Galvanic / Corrosion Series LookupVERIFIED CLEAN]()[Gas Stoichiometry / Molar Volume CalculatorVERIFIED CLEAN]()[General Equilibrium ICE-Table SolverVERIFIED WITH ERRATA]()[Gibbs Free Energy / Spontaneity CalculatorVERIFIED CLEAN]()[Graham's Law Effusion/Diffusion CalculatorVERIFIED CLEAN]()[Half-Life Calculator (multi-order)VERIFIED CLEAN]()[Hardness Scale Converter (HRC/HB/HV/HRB/Mohs)VERIFIED CLEAN]()[Henderson–Hasselbalch Buffer CalculatorVERIFIED CLEAN]()[Hess's Law Enthalpy CalculatorVERIFIED CLEAN]()[Ideal Gas Law CalculatorVERIFIED CLEAN]()[Integrated Rate Law SolverVERIFIED CLEAN]()[Isotope / Average Atomic Mass CalculatorVERIFIED CLEAN]()[Ka/Kb ⇄ pKa/pKb ConverterVERIFIED CLEAN]()[Kc ⇄ Kp ConverterVERIFIED CLEAN]()[Ksp Solubility CalculatorVERIFIED CLEAN]()[Le Chatelier Shift PredictorVERIFIED CLEAN]()[Lewis Structure / Formal Charge HelperVERIFIED CLEAN]()[Molality CalculatorVERIFIED CLEAN]()[Molar Mass / Formula Mass CalculatorVERIFIED WITH ERRATA]()[Molarity CalculatorVERIFIED CLEAN]()[Mole Fraction / Mole Percent CalculatorVERIFIED CLEAN]()[Nernst Equation CalculatorVERIFIED CLEAN]()[Normality / Equivalents CalculatorVERIFIED CLEAN]()[Osmolarity / Osmolality CalculatorVERIFIED CLEAN]()[Percent Composition CalculatorVERIFIED CLEAN]()[Percent Solution / Concentration-Unit ConverterVERIFIED CLEAN]()[Percent Yield CalculatorVERIFIED CLEAN]()[Periodic Table Interactive Lookup PanelVERIFIED CLEAN]()[pH / pOH CalculatorVERIFIED CLEAN]()[Phase Diagram Lever Rule CalculatorVERIFIED CLEAN]()[Polymer Glass Transition Temperature (Tg) LookupVERIFIED CLEAN]()[Radioactive Decay / Half-Life CalculatorVERIFIED CLEAN]()[Rate Law / Reaction-Order DeterminerVERIFIED CLEAN]()[Reaction Quotient (Q) vs Kc/Kp ComparatorVERIFIED WITH ERRATA]()[Reaction Stoichiometry / Limiting Reagent SolverVERIFIED CLEAN]()[Redox Half-Reaction BalancerVERIFIED CLEAN]()[Solution Mixing / Neutralization CalculatorVERIFIED CLEAN]()[Standard Cell Potential (E°cell) CalculatorVERIFIED CLEAN]()[Standard Enthalpy of Reaction (ΔH°f) CalculatorVERIFIED CLEAN]()[Standard Entropy of Reaction CalculatorVERIFIED CLEAN]()[Standard Reduction Potential / Activity Series LookupVERIFIED CLEAN]()[Titration Curve PlotterVERIFIED WITH ERRATA]()[Titration Equivalence-Point CalculatorVERIFIED CLEAN]()[Unit Cell Density CalculatorVERIFIED CLEAN]()[Van der Waals Real-Gas CalculatorVERIFIED WITH ERRATA]()[Van't Hoff Factor EstimatorVERIFIED CLEAN]()[VSEPR Geometry PredictorVERIFIED CLEAN]()[Water Hardness Calculator (ppm CaCO3)VERIFIED CLEAN]()[Weak Acid/Base Ionization Solver (ICE table)VERIFIED CLEAN]() ## Computing & Digital Systems 1 [Number Base ConverterVERIFIED CLEAN]() ## Computing & Information 66 [Algorithm Runtime EstimatorVERIFIED CLEAN]()[Amdahl's Law / Parallel Speedup CalculatorVERIFIED CLEAN]()[Base Encoding Size Calculator (Text/Data Bloat)VERIFIED CLEAN]()[Base Frequency Analyzer (Cryptanalysis Teaching Tool)VERIFIED CLEAN]()[Base64 / URL Encoding ConverterVERIFIED CLEAN]()[Big Integer Base-N ArithmeticVERIFIED CLEAN]()[Big-O Growth Comparison PlotterVERIFIED CLEAN]()[Binary Search / Sorted-Array Step VisualizerVERIFIED CLEAN]()[Binary Tree / Heap Visualizer & Property CalculatorVERIFIED CLEAN]()[Binary/Text Diff & Similarity RatioVERIFIED CLEAN]()[Bitmask / Flag BuilderVERIFIED CLEAN]()[Bitwise Operations CalculatorVERIFIED CLEAN]()[Bloom Filter Sizing CalculatorVERIFIED CLEAN]()[Boolean Logic Truth Table GeneratorVERIFIED CLEAN]()[Caesar / Substitution Cipher ToolVERIFIED CLEAN]()[Character Encoding Converter (UTF-8/16/32, Latin-1)VERIFIED CLEAN]()[Checksum VerifierVERIFIED CLEAN]()[CIDR / Subnet CalculatorVERIFIED CLEAN]()[Color Code ConverterVERIFIED WITH ERRATA]()[Compression Ratio CalculatorVERIFIED CLEAN]()[Consistent Hashing Ring VisualizerVERIFIED CLEAN]()[CPU Cache Hit-Rate / AMAT CalculatorVERIFIED CLEAN]()[CPU Clock Cycle / IPC Performance CalculatorVERIFIED CLEAN]()[Cron Expression ExplainerVERIFIED CLEAN]()[Data Structure Memory Footprint EstimatorVERIFIED CLEAN]()[Database Index Selectivity / Cardinality EstimatorVERIFIED CLEAN]()[dBFS / Audio Level CalculatorVERIFIED CLEAN]()[Diffie-Hellman Key Exchange ToyVERIFIED CLEAN]()[DSP: Sample Rate & Nyquist CalculatorVERIFIED CLEAN]()[FFT Bin Width / Frequency Resolution CalculatorVERIFIED CLEAN]()[Finite State Machine SimulatorVERIFIED CLEAN]()[GPU VRAM vs Model Size LadderVERIFIED CLEAN]()[Graph Shortest-Path Calculator (Dijkstra)VERIFIED CLEAN]()[Hamming Distance / Error-Detection CalculatorVERIFIED CLEAN]()[HTTP Status Code / Header LookupVERIFIED CLEAN]()[IEEE-754 Float InspectorVERIFIED CLEAN]()[IPv6 Address ExplorerVERIFIED CLEAN]()[JSON/XML Size & Depth AnalyzerVERIFIED WITH ERRATA]()[Latency / Bandwidth / Transfer-Time CalculatorVERIFIED CLEAN]()[Levenshtein / Edit Distance CalculatorVERIFIED CLEAN]()[Load Balancer / Queueing Wait-Time Estimator (M/M/1)VERIFIED CLEAN]()[Logic Gate Circuit Simulator (Basic)VERIFIED CLEAN]()[Luhn Algorithm Checksum Validator (Educational)VERIFIED CLEAN]()[Modular Exponentiation CalculatorVERIFIED CLEAN]()[MTBF / MTTR / Reliability CalculatorVERIFIED CLEAN]()[MTU / Packet Fragmentation CalculatorVERIFIED CLEAN]()[Network Speed Test Result InterpreterVERIFIED CLEAN]()[Parity Bit / Simple ECC DemoVERIFIED CLEAN]()[Password / Passphrase Entropy EstimatorVERIFIED WITH ERRATA]()[Primality TesterVERIFIED CLEAN]()[QR Code Payload Size EstimatorVERIFIED CLEAN]()[RAID Capacity & Fault-Tolerance CalculatorVERIFIED CLEAN]()[Regex TesterVERIFIED CLEAN]()[RSA Toy Cipher (Educational)VERIFIED CLEAN]()[Sample/Bit-Rate File Size EstimatorVERIFIED CLEAN]()[SHA-256 / Hash Function DemoVERIFIED CLEAN]()[Shannon Entropy / Information Content CalculatorVERIFIED CLEAN]()[Storage Unit ConverterVERIFIED CLEAN]()[Subnet Splitter / VLSM PlannerVERIFIED CLEAN]()[Time Complexity Comparator for Sorting AlgorithmsVERIFIED CLEAN]()[Time Complexity of Recursive Algorithm (Master Theorem Solver)VERIFIED CLEAN]()[Token / Context-Window Cost CalculatorVERIFIED CLEAN]()[Two's Complement CalculatorVERIFIED CLEAN]()[Unicode / ASCII Code Point LookupVERIFIED CLEAN]()[Uptime / SLA Availability CalculatorVERIFIED CLEAN]()[URL / Query String ParserVERIFIED CLEAN]() ## Earth & Space 5 [Distance ModulusVERIFIED CLEAN]()[Magnitude ↔ Flux RatioVERIFIED CLEAN]()[Stellar Parallax DistanceVERIFIED CLEAN]()[Telescope f-ratioVERIFIED CLEAN]()[Tide Table Lookup (local station)DISPOSED UNVERIFIABLE OFFLINE]() ## Earth & Space (astronomy, orbital mechanics, meteorology, geology, geodesy, oceanography) 76 [Absolute Magnitude of Solar System Body (H) ↔ DiameterVERIFIED CLEAN]()[Air Density CalculatorVERIFIED CLEAN]()[Angular Size ↔ Physical SizeVERIFIED CLEAN]()[Apparent Stellar Motion / Proper Motion ProjectorVERIFIED CLEAN]()[Astronomical Twilight DurationVERIFIED WITH ERRATA]()[Barometric Formula (Pressure vs Altitude, general)VERIFIED CLEAN]()[Beaufort Wind Scale LookupVERIFIED CLEAN]()[Beaufort-to-Wave-Height Sea StateVERIFIED CLEAN]()[CAPE Estimator (simplified)VERIFIED CLEAN]()[Circular Orbital VelocityVERIFIED CLEAN]()[Cloud Base Height from Spread (quick field rule)VERIFIED CLEAN]()[Coordinate Format Converter (multi)VERIFIED CLEAN]()[Coriolis Deflection EstimatorVERIFIED CLEAN]()[Deep-Water Wave Speed & PeriodVERIFIED CLEAN]()[Dew Point CalculatorVERIFIED CLEAN]()[DMS ↔ Decimal DegreesVERIFIED CLEAN]()[Earthquake Magnitude Comparison (energy ratio)VERIFIED CLEAN]()[Escape VelocityVERIFIED CLEAN]()[Exoplanet Transit DepthVERIFIED CLEAN]()[Geologic Strain/Dip-Strike HelperVERIFIED CLEAN]()[Geothermal Gradient / Depth-TemperatureVERIFIED CLEAN]()[Great Lapse Rate / Adiabatic CoolingVERIFIED CLEAN]()[Great-Circle Distance (Haversine)VERIFIED CLEAN]()[Ground Track / Orbital Period vs AltitudeVERIFIED CLEAN]()[Habitable-Zone Distance (rough)VERIFIED CLEAN]()[Haversine Sunrise-Azimuth Bearing (great circle course)VERIFIED CLEAN]()[Heat Index (Apparent Temperature)VERIFIED CLEAN]()[Hohmann Transfer Delta-VVERIFIED CLEAN]()[HR Diagram PlotterVERIFIED CLEAN]()[Hydraulic Conductivity / Darcy FluxVERIFIED CLEAN]()[Julian Date ConverterVERIFIED CLEAN]()[Köppen Climate Classifier (rough)VERIFIED CLEAN]()[Lat/Lon ↔ UTM ConverterVERIFIED WITH ERRATA]()[Lifting Condensation Level (LCL) HeightVERIFIED CLEAN]()[Light Travel TimeVERIFIED CLEAN]()[Limiting Magnitude EstimatorVERIFIED CLEAN]()[Luminosity from Radius & TemperatureVERIFIED CLEAN]()[Magnetic Declination LookupVERIFIED CLEAN]()[Moon Phase CalculatorVERIFIED CLEAN]()[Moonrise/Moonset EstimatorVERIFIED CLEAN]()[Orbital Eccentricity/Apsides SolverVERIFIED CLEAN]()[Orbital Inclination Plane-Change ΔvVERIFIED CLEAN]()[Orbital Period (Kepler's 3rd Law)VERIFIED CLEAN]()[Plate Motion Rate & Distance ProjectorVERIFIED CLEAN]()[Porosity CalculatorVERIFIED CLEAN]()[Pressure Altitude / Density AltitudeVERIFIED CLEAN]()[Radiocarbon (C-14) Age with Calibration NoteVERIFIED CLEAN]()[Radiometric Dating CalculatorVERIFIED CLEAN]()[Redshift ↔ Velocity/DistanceVERIFIED CLEAN]()[Relative Humidity from Wet/Dry BulbVERIFIED CLEAN]()[Richter/Moment Magnitude ↔ Seismic EnergyVERIFIED CLEAN]()[Rip Current Risk Rough EstimatorVERIFIED CLEAN]()[Rocket Equation (Tsiolkovsky)VERIFIED WITH ERRATA]()[Saffir-Simpson Hurricane CategoryVERIFIED CLEAN]()[Seawater Density (simplified EOS)VERIFIED CLEAN]()[Shallow-Water Wave Speed & Breaking DepthVERIFIED CLEAN]()[Sidereal vs Solar Time ConverterVERIFIED CLEAN]()[Solar Elevation Shadow-Length CalculatorVERIFIED CLEAN]()[Solar Position (Sun Az/Alt)VERIFIED CLEAN]()[Standard Atmosphere Lapse Rate ModelVERIFIED CLEAN]()[Stream/Sediment Settling Velocity (Stokes)VERIFIED CLEAN]()[Sunrise/Sunset CalculatorVERIFIED CLEAN]()[Synodic Period CalculatorVERIFIED CLEAN]()[Telescope Field of ViewVERIFIED CLEAN]()[Telescope MagnificationVERIFIED CLEAN]()[Telescope Resolving Power (Dawes/Rayleigh)VERIFIED CLEAN]()[Time Zone / Local Solar Time OffsetVERIFIED CLEAN]()[Transit Duration & Impact ParameterVERIFIED CLEAN]()[UV Index Exposure Time EstimatorVERIFIED CLEAN]()[Vincenty Ellipsoidal DistanceVERIFIED WITH ERRATA]()[Vis-Viva Equation SolverVERIFIED CLEAN]()[Wave Energy Flux EstimatorVERIFIED CLEAN]()[Wentworth Grain-Size ClassifierVERIFIED CLEAN]()[Wien's Law Peak WavelengthVERIFIED CLEAN]()[Wind ChillVERIFIED CLEAN]()[Wind Speed Unit/Force ConverterVERIFIED CLEAN]() ## Electrical & Electronics 1 [Ohm's Law SolverVERIFIED CLEAN]() ## Electrical & Electronics Engineering 4 [RC/RL Time Constant & Transient SolverVERIFIED CLEAN]()[RLC Resonance & Response SolverVERIFIED CLEAN]()[Series/Parallel Resistor CombinerVERIFIED CLEAN]()[Voltage/Current DividerVERIFIED CLEAN]() ## Electrical & Electronics Engineering — Circuits, Power Systems, Electronics Lab 82 [555 Timer Astable/Monostable CalculatorVERIFIED CLEAN]()[AC Power Triangle CalculatorVERIFIED CLEAN]()[Antenna Length Calculator (dipole/monopole/whip)VERIFIED CLEAN]()[Arc Flash Incident Energy Estimator (simplified IEEE 1584-style)VERIFIED CLEAN]()[Battery Capacity / C-Rate / Runtime CalculatorVERIFIED CLEAN]()[Battery Charge Time EstimatorVERIFIED CLEAN]()[Battery Pack Series/Parallel ConfiguratorVERIFIED CLEAN]()[BJT Amplifier Gain Estimator (Common-Emitter)VERIFIED WITH ERRATA]()[BJT Bias Point Calculator (Voltage Divider Bias)VERIFIED WITH ERRATA]()[Bode Plot Generator (generic transfer function)VERIFIED CLEAN]()[Capacitor Code DecoderVERIFIED CLEAN]()[Capacitor Energy & Charge CalculatorVERIFIED CLEAN]()[Capacitor Series/Parallel CombinerVERIFIED CLEAN]()[Class A/B/AB Amplifier Efficiency & Dissipation EstimatorVERIFIED CLEAN]()[Coax Cable Loss & Power Handling EstimatorVERIFIED CLEAN]()[Crystal Oscillator Load Capacitance CalculatorVERIFIED CLEAN]()[DC Motor Starting Current & Back-EMF EstimatorVERIFIED CLEAN]()[Decibel (dB) ConverterVERIFIED CLEAN]()[Decoupling Capacitor SelectorVERIFIED WITH ERRATA]()[Diode Bridge Rectifier Loss EstimatorVERIFIED CLEAN]()[Duty Cycle / PWM Average Voltage CalculatorVERIFIED CLEAN]()[Electrical Safety / Shock Current ReferenceVERIFIED CLEAN]()[EMC/EMI Near-Field Distance & Wavelength CalculatorVERIFIED CLEAN]()[Filter Designer — Active Sallen-Key (2nd order)VERIFIED CLEAN]()[Filter Designer — Higher-Order (Butterworth/Chebyshev) Response PlotterVERIFIED CLEAN]()[Filter Designer — RC Low-Pass/High-PassVERIFIED CLEAN]()[Fuse/Breaker Trip Time Curve ViewerVERIFIED CLEAN]()[Generator Sizing Calculator (backup power)VERIFIED CLEAN]()[Ground Loop / Common-Impedance Voltage EstimatorVERIFIED CLEAN]()[Heat Sink Thermal Resistance CalculatorVERIFIED CLEAN]()[Impedance Matching Network Designer (L-network)VERIFIED CLEAN]()[Induction Motor Slip & Speed CalculatorVERIFIED CLEAN]()[Inductor Energy CalculatorVERIFIED CLEAN]()[Inductor Series/Parallel CombinerVERIFIED CLEAN]()[Inrush Current / Fuse & Breaker Sizing EstimatorVERIFIED CLEAN]()[kWh Cost / Energy Bill EstimatorVERIFIED CLEAN]()[LED Series Resistor CalculatorVERIFIED CLEAN]()[Linear Regulator Power Dissipation & Heatsink NeedVERIFIED CLEAN]()[Materials Resistivity/Conductivity TableVERIFIED CLEAN]()[MOSFET Switching Power Loss EstimatorVERIFIED WITH ERRATA]()[Motor Torque/Power/Speed ConverterVERIFIED CLEAN]()[Mutual Inductance / Coupled Coil CalculatorVERIFIED CLEAN]()[NEC/IEC Conduit Fill CalculatorVERIFIED CLEAN]()[Nyquist / Wien Bridge Oscillator Frequency CalculatorVERIFIED CLEAN]()[Off-Grid Battery Bank Sizing (Solar)VERIFIED CLEAN]()[Op-Amp Bandwidth / Gain-Bandwidth Product CheckerVERIFIED CLEAN]()[Op-Amp Gain Calculator (Inverting/Non-inverting/Diff)VERIFIED CLEAN]()[Op-Amp Noise Estimator (input-referred)VERIFIED CLEAN]()[Op-Amp Summing/Integrator/Differentiator DesignerVERIFIED CLEAN]()[PCB Trace Impedance Calculator (Microstrip/Stripline)VERIFIED CLEAN]()[PCB Trace Resistance & Voltage DropVERIFIED CLEAN]()[PCB Trace Width Calculator (IPC-2221)VERIFIED CLEAN]()[PCB Via Current Capacity CalculatorVERIFIED CLEAN]()[Phasor / Impedance CalculatorVERIFIED CLEAN]()[Physical Constants ReferenceVERIFIED CLEAN]()[Power Factor Correction Capacitor SizerVERIFIED CLEAN]()[Rectifier/DC Power Supply Ripple CalculatorVERIFIED CLEAN]()[Resistor Color Code Decoder/EncoderVERIFIED CLEAN]()[Sample Rate / Nyquist & ADC Resolution CalculatorVERIFIED WITH ERRATA]()[Schmitt Trigger Threshold CalculatorVERIFIED WITH ERRATA]()[Short-Circuit Fault Current Estimator (simplified)VERIFIED CLEAN]()[Shot Noise CalculatorVERIFIED CLEAN]()[Signal-to-Noise Ratio / SINAD / ENOB CalculatorVERIFIED WITH ERRATA]()[Skin Effect / Skin Depth CalculatorVERIFIED CLEAN]()[Solar Charge Controller Sizing (PWM/MPPT)VERIFIED CLEAN]()[Solar PV Array Sizing CalculatorVERIFIED CLEAN]()[Speaker/Load Impedance Matching CalculatorVERIFIED CLEAN]()[Standard Value Finder (E-series)VERIFIED CLEAN]()[Switching Regulator (Boost) Component CalculatorVERIFIED WITH ERRATA]()[Switching Regulator (Buck) Component CalculatorVERIFIED CLEAN]()[Thermal (Johnson-Nyquist) Noise CalculatorVERIFIED WITH ERRATA]()[Thermal Expansion CalculatorVERIFIED CLEAN]()[Three-Phase Power CalculatorVERIFIED WITH ERRATA]()[Transformer Efficiency & Losses EstimatorVERIFIED CLEAN]()[Transformer Turns Ratio & Sizing CalculatorVERIFIED CLEAN]()[Transmission Line / SWR CalculatorVERIFIED CLEAN]()[Unit Converter (electrical)VERIFIED CLEAN]()[Voltage Drop Calculator (wire run)VERIFIED CLEAN]()[Voltage Regulator (Linear) Resistor/Output CalculatorVERIFIED CLEAN]()[Wire Ampacity CalculatorVERIFIED CLEAN]()[Wire Gauge (AWG/SWG) ↔ Diameter/Area ConverterVERIFIED CLEAN]()[Zener Diode Regulator Design CalculatorVERIFIED CLEAN]() ## Everyday & Life 63 [0-60 mph Estimator (Educational)VERIFIED CLEAN]()[Age CalculatorVERIFIED WITH ERRATA]()[Aquarium Volume & Stocking CalculatorVERIFIED CLEAN]()[Baker's Percentage ConverterVERIFIED CLEAN]()[Brine & Marinade Salinity CalculatorVERIFIED 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Rate Zone CalculatorVERIFIED CLEAN]()[Household Water Usage CalculatorVERIFIED CLEAN]()[Hydration Needs EstimatorVERIFIED CLEAN]()[Ingredient Substitution Ratio CalculatorVERIFIED CLEAN]()[Insulation/HVAC BTU Load Estimator (Rule of Thumb)VERIFIED CLEAN]()[Jet Lag PlannerVERIFIED CLEAN]()[Kitchen Unit & Volume-Weight ConverterVERIFIED CLEAN]()[Layover Connection Time CheckerVERIFIED CLEAN]()[Leftover/Freshness Countdown TrackerVERIFIED CLEAN]()[Lumber Board-Foot CalculatorVERIFIED CLEAN]()[Meal Prep Portion CalculatorVERIFIED CLEAN]()[Mortgage vs Rent ComparatorVERIFIED WITH ERRATA]()[Moving Box / Truck Size EstimatorVERIFIED CLEAN]()[Mulch/Soil/Gravel Volume CalculatorVERIFIED CLEAN]()[One-Rep Max Calculator (Epley/Brzycki)VERIFIED CLEAN]()[Oven Temperature ConverterVERIFIED CLEAN]()[Pace / Split CalculatorVERIFIED CLEAN]()[Packing Weight CheckerVERIFIED CLEAN]()[Paint Coverage CalculatorVERIFIED CLEAN]()[Race Time Predictor (Riegel Formula)VERIFIED CLEAN]()[Reading Time EstimatorVERIFIED CLEAN]()[Recipe ScalerVERIFIED CLEAN]()[Road Trip Cost SplitterVERIFIED CLEAN]()[Roof Pitch & Rafter CalculatorVERIFIED CLEAN]()[Roof/Attic Insulation R-Value CalculatorVERIFIED CLEAN]()[Sous-Vide Time & Temperature LookupVERIFIED CLEAN]()[Stair Rise & Run DesignerVERIFIED CLEAN]()[Tile & Flooring CalculatorVERIFIED CLEAN]()[Time Zone ConverterVERIFIED CLEAN]()[Tip & Bill Split CalculatorVERIFIED CLEAN]()[Tire Size ComparatorVERIFIED CLEAN]()[Travel Currency Tip/Rounding HelperVERIFIED CLEAN]()[Trip Fuel Cost CalculatorVERIFIED CLEAN]()[Typing WPM / Accuracy CalculatorVERIFIED CLEAN]()[Unit Price / Best-Value ComparatorVERIFIED CLEAN]()[Wallpaper Roll CalculatorVERIFIED CLEAN]()[Window/Door Rough Opening CalculatorVERIFIED CLEAN]()[Work Hours / Timesheet CalculatorVERIFIED CLEAN]() ## Finance, Economics & Business 5 [Future Value (Lump Sum)VERIFIED CLEAN]()[Loan/Mortgage PaymentVERIFIED WITH ERRATA]()[Ordinary Annuity FV/PVVERIFIED WITH ERRATA]()[Perpetuity ValueVERIFIED CLEAN]()[Present Value (Lump Sum)VERIFIED CLEAN]() ## Finance, Economics & Business (educational only — never individualized investment, tax, or legal advice) 86 [401(k)/IRA Contribution & Match OptimizerVERIFIED CLEAN]()[50/30/20 Budget SplitterVERIFIED CLEAN]()[Amortization ScheduleVERIFIED WITH ERRATA]()[APR vs APY ConverterVERIFIED CLEAN]()[Bill Split CalculatorVERIFIED CLEAN]()[Black-Scholes Option Price (Educational)VERIFIED CLEAN]()[Bond Duration & ConvexityVERIFIED CLEAN]()[Bond Price / YTM CalculatorVERIFIED CLEAN]()[Break-Even & Contribution Margin DashboardVERIFIED CLEAN]()[Break-Even Analysis for Business LoanVERIFIED CLEAN]()[Break-Even Units CalculatorVERIFIED CLEAN]()[Burn Rate & Runway CalculatorVERIFIED CLEAN]()[Cap Table Dilution (Simple)VERIFIED CLEAN]()[CAPM Expected ReturnVERIFIED CLEAN]()[Car Loan / Total Cost of Ownership CalculatorVERIFIED CLEAN]()[Closing Costs & Cash-to-Close EstimatorVERIFIED CLEAN]()[Compound Interest VisualizerVERIFIED CLEAN]()[Credit Card Payoff PlannerVERIFIED CLEAN]()[Currency Converter (Offline Snapshot)VERIFIED CLEAN]()[Currency-Adjusted Salary Comparator (Cost of Living)VERIFIED CLEAN]()[DCF Valuation (Simple)VERIFIED WITH ERRATA]()[Debt Avalanche vs SnowballVERIFIED WITH ERRATA]()[Debt Service Coverage Ratio (DSCR)VERIFIED CLEAN]()[Debt-to-Income Ratio CalculatorVERIFIED CLEAN]()[Declining Balance / Double-Declining DepreciationVERIFIED WITH ERRATA]()[Depreciation Calculator (Straight-Line)VERIFIED CLEAN]()[Dividend Yield & Growth (DDM)VERIFIED CLEAN]()[EBITDA / Operating Margin BuilderVERIFIED WITH ERRATA]()[Effective Annual Rate Comparator (Multiple Loans/Cards)VERIFIED CLEAN]()[Emergency Fund SizerVERIFIED CLEAN]()[EOQ / Inventory Reorder CalculatorVERIFIED WITH ERRATA]()[Exchange Rate Pass-Through / Pip Value CalculatorVERIFIED CLEAN]()[Extra-Payment Payoff ImpactVERIFIED CLEAN]()[GDP Growth Rate CalculatorVERIFIED WITH ERRATA]()[Gini Coefficient / Lorenz Curve EstimatorVERIFIED CLEAN]()[Hourly Rate / Freelance Pricing CalculatorVERIFIED CLEAN]()[HSA Triple-Tax-Advantage CalculatorVERIFIED WITH ERRATA]()[Inflation Adjuster (CPI)VERIFIED CLEAN]()[Invoice Late Fee / Payment Terms CalculatorVERIFIED CLEAN]()[IRR SolverVERIFIED CLEAN]()[IRS Contribution Limit Lookup (401k/IRA/HSA)VERIFIED CLEAN]()[Kelly Criterion CalculatorVERIFIED CLEAN]()[Lease vs Buy ComparatorVERIFIED CLEAN]()[LTV / CAC / Payback Unit EconomicsVERIFIED WITH ERRATA]()[MACRS Depreciation CalculatorVERIFIED CLEAN]()[Margin vs Markup ConverterVERIFIED CLEAN]()[Monte Carlo Retirement SimulatorVERIFIED CLEAN]()[MRR/ARR & Churn TrackerVERIFIED WITH ERRATA]()[Net Worth Tracker/CalculatorVERIFIED CLEAN]()[NPV CalculatorVERIFIED CLEAN]()[Options Payoff DiagramVERIFIED CLEAN]()[Payback Period CalculatorVERIFIED CLEAN]()[Paycheck / Take-Home Pay EstimatorVERIFIED CLEAN]()[Payroll / Employee Cost Calculator (Employer Side)VERIFIED CLEAN]()[Payroll Deduction / Paystub Breakdown SimulatorVERIFIED CLEAN]()[PMI / LTV EstimatorVERIFIED CLEAN]()[Portfolio Diversification / CorrelationVERIFIED CLEAN]()[Price Elasticity of Demand CalculatorVERIFIED CLEAN]()[Pricing/Discount & Markdown CalculatorVERIFIED CLEAN]()[Purchasing Power Parity (PPP) ComparatorVERIFIED CLEAN]()[Quarterly Estimated Tax PlannerVERIFIED CLEAN]()[Real Estate Cap Rate & Cash-on-Cash ReturnVERIFIED CLEAN]()[Real GDP / GDP Deflator ConverterVERIFIED CLEAN]()[Real vs Nominal ReturnVERIFIED CLEAN]()[Refinance Break-EvenVERIFIED CLEAN]()[Rent vs Buy (Home) ComparatorVERIFIED CLEAN]()[Rental Property Cash Flow AnalyzerVERIFIED WITH ERRATA]()[Retirement Nest Egg (4% Rule) EstimatorVERIFIED CLEAN]()[ROI CalculatorVERIFIED CLEAN]()[Rule of 70 GDP Doubling TimeVERIFIED CLEAN]()[Rule of 72 / 70 / 114 EstimatorVERIFIED CLEAN]()[SAFE/Convertible Note Conversion (Simple)VERIFIED CLEAN]()[Salary/Raise Purchasing-Power CheckVERIFIED CLEAN]()[Sales Commission CalculatorVERIFIED CLEAN]()[Sales Tax CalculatorVERIFIED CLEAN]()[Savings Goal PlannerVERIFIED WITH ERRATA]()[Self-Employment Tax EstimatorVERIFIED CLEAN]()[Social Security Benefit Estimator (Simplified)VERIFIED CLEAN]()[Student Loan Payoff & IDR EstimateVERIFIED CLEAN]()[Tax Bracket / Marginal Rate EstimatorVERIFIED CLEAN]()[Tip CalculatorVERIFIED CLEAN]()[Unemployment & Labor Force Rate CalculatorVERIFIED CLEAN]()[Unit Conversion Cost ComparatorVERIFIED CLEAN]()[Valuation Multiples ComparatorVERIFIED CLEAN]()[WACC CalculatorVERIFIED CLEAN]()[Working Capital & Liquidity RatiosVERIFIED CLEAN]() ## Finance/Economics 1 [Currency Converter (Live)DISPOSED UNVERIFIABLE OFFLINE]() ## Mathematics 5 [Base Converter & Bitwise ToolkitVERIFIED WITH ERRATA]()[Fraction & Percent ToolkitVERIFIED CLEAN]()[Long Division / Long Multiplication StepperVERIFIED CLEAN]()[Polynomial Operations (add/sub/mul/div/synthetic division)VERIFIED CLEAN]()[Vector Operations ToolkitVERIFIED CLEAN]() ## Mathematics — arithmetic through advanced (algebra, matrices, calculus, sequences/series, number theory, combinatorics, graphing, complex numbers, geometry, logic, sets) 71 [2D Shape Area/Perimeter CalculatorVERIFIED CLEAN]()[3D Solid Volume/Surface Area CalculatorVERIFIED CLEAN]()[3D Surface PlotterVERIFIED CLEAN]()[Base-N & Number System ConverterVERIFIED CLEAN]()[Big Number / Arbitrary Precision CalculatorVERIFIED CLEAN]()[Binomial Theorem ExpanderVERIFIED CLEAN]()[Boolean Expression Simplifier (Karnaugh Map)VERIFIED CLEAN]()[CAS Simplifier / SolverVERIFIED CLEAN]()[Combinatorics Calculator (nCr/nPr/multinomial)VERIFIED CLEAN]()[Complex Number CalculatorVERIFIED CLEAN]()[Complex Roots & De Moivre VisualizerVERIFIED CLEAN]()[Conic Section Identifier & PlotterVERIFIED CLEAN]()[Continued Fraction ConverterVERIFIED WITH ERRATA]()[Coordinate Geometry ToolkitVERIFIED CLEAN]()[Correlation & Covariance CalculatorVERIFIED CLEAN]()[Derivative Calculator (symbolic + numeric)VERIFIED WITH ERRATA]()[Diophantine Equation Solver (linear)VERIFIED WITH ERRATA]()[Eigenvalue/Eigenvector Visualizer (2D)VERIFIED CLEAN]()[Function Composition & Inverse FinderVERIFIED CLEAN]()[Function Domain/Range AnalyzerVERIFIED CLEAN]()[Function Transformation VisualizerVERIFIED CLEAN]()[GCD/LCM CalculatorVERIFIED CLEAN]()[Geometry Solver — TriangleVERIFIED WITH ERRATA]()[Golden Ratio & Fibonacci ExplorerVERIFIED CLEAN]()[Graph Plotter — 2D FunctionVERIFIED WITH ERRATA]()[Hypothesis Test Calculator (t-test/z-test/chi²)VERIFIED WITH ERRATA]()[Implicit Function PlotterVERIFIED CLEAN]()[Inequality Solver & Number-Line GrapherVERIFIED CLEAN]()[Integral Calculator (symbolic + numeric)VERIFIED CLEAN]()[Limit CalculatorVERIFIED CLEAN]()[Linear Equation SolverVERIFIED CLEAN]()[Logic Gate Circuit SimulatorVERIFIED CLEAN]()[Logic Truth Table GeneratorVERIFIED CLEAN]()[Magic Square / Latin Square GeneratorVERIFIED CLEAN]()[Mandelbrot / Julia Set ExplorerVERIFIED CLEAN]()[Markov Chain SimulatorVERIFIED WITH ERRATA]()[Matrix Calculator (det/inverse/rref/eigen/least-squares)VERIFIED CLEAN]()[Matrix Transformation Visualizer (2D)VERIFIED CLEAN]()[Modular Arithmetic ToolkitVERIFIED CLEAN]()[Normal Distribution CalculatorVERIFIED WITH ERRATA]()[Numeric Root Finder (Newton/Bisection/Secant)VERIFIED CLEAN]()[ODE Solver (Euler / RK4 / RK45)VERIFIED CLEAN]()[Optimization (1D min/max finder)VERIFIED CLEAN]()[Other Distributions Calculator (binomial/Poisson/t/chi²)VERIFIED CLEAN]()[Parametric Curve PlotterVERIFIED CLEAN]()[Partial Fraction DecompositionVERIFIED CLEAN]()[Pascal's Triangle ExplorerVERIFIED CLEAN]()[Pigeonhole & Counting Principle DemonstratorVERIFIED CLEAN]()[Polar Curve PlotterVERIFIED WITH ERRATA]()[Polynomial GCD / FactoringVERIFIED CLEAN]()[Polynomial Root FinderVERIFIED CLEAN]()[Power Series Radius of ConvergenceVERIFIED CLEAN]()[Prime Checker & Generator (Sieve)VERIFIED WITH ERRATA]()[Prime Factorization & Divisor ExplorerVERIFIED CLEAN]()[Probability Basics CalculatorVERIFIED CLEAN]()[Quadratic Equation SolverVERIFIED CLEAN]()[Random Number & Distribution SamplerVERIFIED CLEAN]()[Regression Toolkit (linear/poly/exp/log)VERIFIED WITH ERRATA]()[Scientific CalculatorVERIFIED CLEAN]()[Sequence & Series ExplorerVERIFIED CLEAN]()[Series Convergence TesterVERIFIED CLEAN]()[Set Cardinality & Power Set GeneratorVERIFIED CLEAN]()[Set Operations Visualizer (Venn)VERIFIED CLEAN]()[Slope Field / Direction Field PlotterVERIFIED CLEAN]()[Statistics Suite (descriptive stats)VERIFIED CLEAN]()[Summation & Product Notation EvaluatorVERIFIED CLEAN]()[System of Equations Solver (n×n linear)VERIFIED CLEAN]()[Taylor / Maclaurin Series GeneratorVERIFIED CLEAN]()[Trigonometric Identity Verifier & SimplifierVERIFIED CLEAN]()[Unit & Dimensional Analysis ConverterVERIFIED CLEAN]()[Unit Circle ExplorerVERIFIED CLEAN]() ## Mechanical, Civil & Structural Engineering 4 [Beam Deflection — Cantilever, Point Load at Free EndVERIFIED CLEAN]()[Beam Deflection — Cantilever, UDLVERIFIED WITH ERRATA]()[Beam Deflection — Fixed-Fixed, Point/UDLVERIFIED WITH ERRATA]()[Beam Deflection — Propped CantileverVERIFIED CLEAN]() ## Mechanical, Civil & Structural Engineering — Statics/Dynamics, Strength of Materials, Machine Design, Civil, HVAC, Vibration 89 [Axial Stress & Strain CalculatorVERIFIED CLEAN]()[Banked Curve / Centripetal Force CalculatorVERIFIED CLEAN]()[Beam Deflection — Overhanging BeamVERIFIED WITH ERRATA]()[Beam Deflection & Reactions — Simply Supported, Point LoadVERIFIED CLEAN]()[Beam Deflection & Reactions — Simply Supported, UDLVERIFIED CLEAN]()[Bearing Equivalent Dynamic Load CalculatorVERIFIED CLEAN]()[Bearing L10 Life CalculatorVERIFIED CLEAN]()[Belt & Pulley Speed/Length CalculatorVERIFIED CLEAN]()[Belt Friction (Capstan Equation)VERIFIED CLEAN]()[Bolt Group / Eccentric Fastener Pattern SolverVERIFIED WITH ERRATA]()[Bolt Torque-to-Preload CalculatorVERIFIED WITH ERRATA]()[Bolted Joint Strength CalculatorVERIFIED CLEAN]()[Cable/Catenary Sag-Tension CalculatorVERIFIED WITH ERRATA]()[Centroid & Center of Mass Calculator (Composite Areas/Bodies)VERIFIED CLEAN]()[CFM ↔ Air Changes per Hour ConverterVERIFIED CLEAN]()[Clutch/Brake Torque Capacity CalculatorVERIFIED WITH ERRATA]()[Collision Solver (1D Elastic/Inelastic)VERIFIED CLEAN]()[Column Buckling — Euler Critical LoadVERIFIED CLEAN]()[Composite Section BuilderVERIFIED WITH ERRATA]()[Concrete Mix Design Calculator (ACI Method, Simplified)VERIFIED CLEAN]()[Crane Hook / Lifting Sling Angle Load CalculatorVERIFIED CLEAN]()[Culvert/Pipe Sizing CalculatorVERIFIED CLEAN]()[Damped Vibration Response CalculatorVERIFIED WITH ERRATA]()[Darcy-Weisbach Pressure DropVERIFIED CLEAN]()[Degree-Day Energy EstimatorVERIFIED CLEAN]()[Duct Sizing Calculator (Equal Friction Method)VERIFIED CLEAN]()[Factor of Safety / Allowable Stress CalculatorVERIFIED CLEAN]()[Fan/Pump Affinity Laws CalculatorVERIFIED CLEAN]()[Fatigue S-N Curve / Life EstimatorVERIFIED CLEAN]()[Flywheel Energy Storage CalculatorVERIFIED WITH ERRATA]()[Footing Size Calculator (Preliminary)VERIFIED CLEAN]()[Forced Vibration / Resonance Response CalculatorVERIFIED CLEAN]()[Free Body Diagram / Reaction Solver (2D Rigid Body)VERIFIED CLEAN]()[Friction Wedge / Inclined Plane SolverVERIFIED CLEAN]()[Gear Ratio & Train CalculatorVERIFIED WITH ERRATA]()[Gear Tooth Bending Stress (Lewis Equation)VERIFIED CLEAN]()[Goodman / Soderberg Fatigue DiagramVERIFIED CLEAN]()[Helical Compression/Extension Spring DesignerVERIFIED CLEAN]()[HVAC Heating/Cooling Load Estimator (Envelope Method)VERIFIED CLEAN]()[Impact Load Factor CalculatorVERIFIED CLEAN]()[Johnson Parabolic Formula (Intermediate Columns)VERIFIED CLEAN]()[Key & Keyway Shear/Bearing Stress CalculatorVERIFIED CLEAN]()[Kinematics — Uniformly Accelerated Motion SolverVERIFIED CLEAN]()[Marin Endurance Limit ModifiersVERIFIED CLEAN]()[Mohr's Circle for 3D Stress (Principal Stresses)VERIFIED CLEAN]()[Mohr's Circle for Plane StressVERIFIED CLEAN]()[Moment of Inertia / Section Properties CalculatorVERIFIED CLEAN]()[Multi-Span Continuous Beam SolverVERIFIED WITH ERRATA]()[Natural Frequency of Spring-Mass SystemVERIFIED CLEAN]()[Open-Channel Flow — Manning's EquationVERIFIED CLEAN]()[Parallel Axis Theorem CalculatorVERIFIED CLEAN]()[Pavement Thickness — Simplified (AASHTO/CBR Method)VERIFIED CLEAN]()[Pipe/Duct Reynolds Number & Flow RegimeVERIFIED CLEAN]()[Press/Shrink Fit Interference CalculatorVERIFIED CLEAN]()[Projectile Motion SolverVERIFIED CLEAN]()[R-Value / U-Value Wall Assembly CalculatorVERIFIED CLEAN]()[Rational Method Peak Runoff CalculatorVERIFIED CLEAN]()[Rebar Area / Spacing CalculatorVERIFIED CLEAN]()[Rebar Development Length CalculatorVERIFIED CLEAN]()[Reinforced Concrete Beam — Singly Reinforced Flexural CapacityVERIFIED WITH ERRATA]()[Retaining Wall — Rankine Active/Passive Earth PressureVERIFIED CLEAN]()[Rotating Unbalance Force CalculatorVERIFIED CLEAN]()[Rotational Kinematics & Moment of Inertia (Rigid Bodies)VERIFIED CLEAN]()[Screw Jack / Power Screw Torque CalculatorVERIFIED CLEAN]()[Sensible & Latent Heat / Psychrometric CalculatorVERIFIED CLEAN]()[Shaft Diameter Sizing (Torsion + Bending)VERIFIED WITH ERRATA]()[Shaft Power-Torque-Speed CalculatorVERIFIED CLEAN]()[Shear & Moment Diagram PlotterVERIFIED WITH ERRATA]()[Slope Stability — Infinite Slope MethodVERIFIED CLEAN]()[Soil Bearing Capacity — Terzaghi SimplifiedVERIFIED CLEAN]()[Spring Fatigue Life Estimator (Wahl + Goodman)VERIFIED CLEAN]()[Spur Gear Geometry CalculatorVERIFIED CLEAN]()[Stress Concentration Factor LookupVERIFIED CLEAN]()[Thermal Stress CalculatorVERIFIED CLEAN]()[Thick-Wall Cylinder Stress (Lamé)VERIFIED CLEAN]()[Thin-Wall Pressure Vessel StressVERIFIED CLEAN]()[Torsion (Helical) Spring CalculatorVERIFIED CLEAN]()[Torsion of Circular ShaftsVERIFIED CLEAN]()[Torsional Vibration Natural FrequencyVERIFIED CLEAN]()[Truss Determinacy CheckerVERIFIED CLEAN]()[Truss Solver (Method of Joints)VERIFIED CLEAN]()[Unit Weight / Self-Weight Load Calculator (Structural Members)VERIFIED CLEAN]()[V-Belt Power Rating CalculatorVERIFIED CLEAN]()[Vibration Isolation Transmissibility CalculatorVERIFIED WITH ERRATA]()[Von Mises / Tresca Failure Criteria CheckerVERIFIED CLEAN]()[Water-Cement Ratio ↔ Strength EstimatorVERIFIED CLEAN]()[Weld Group (Line) Property CalculatorVERIFIED CLEAN]()[Welded Joint Strength CalculatorVERIFIED CLEAN]()[Work-Energy & Impulse-Momentum CalculatorVERIFIED CLEAN]() ## Physics 5 [2D Kinematics Vector SolverVERIFIED CLEAN]()[Optimal Launch Angle FinderVERIFIED CLEAN]()[Relative Velocity Composition (classical)VERIFIED CLEAN]()[SUVAT Kinematics SolverVERIFIED CLEAN]()[Terminal Velocity CalculatorVERIFIED WITH ERRATA]() ## Physics — Kinematics/Projectiles/Orbits, Forces/Energy/Momentum, Rotational Dynamics, Gravitation, Oscillations/Waves, Optics, E&M Fields, Relativity, Quantum, Statistical Thermo 80 [1D Elastic Collision SolverVERIFIED CLEAN]()[1D/2D Inelastic Collision Solver (coefficient of restitution)VERIFIED CLEAN]()[2D Collision Solver (oblique)VERIFIED CLEAN]()[Angular Momentum CalculatorVERIFIED CLEAN]()[Atwood Machine SolverVERIFIED CLEAN]()[Beat Frequency CalculatorVERIFIED CLEAN]()[Biot-Savart Field of a Straight Wire CalculatorVERIFIED CLEAN]()[Blackbody Spectral Radiance Plotter (Planck's Law)VERIFIED WITH ERRATA]()[Bohr Model Hydrogen Energy Levels CalculatorVERIFIED CLEAN]()[Brewster's Angle CalculatorVERIFIED CLEAN]()[Center of Mass CalculatorVERIFIED CLEAN]()[Circular Orbital Velocity & Period CalculatorVERIFIED WITH ERRATA]()[CODATA Physical Constants ReferenceVERIFIED CLEAN]()[Coulomb's Law CalculatorVERIFIED CLEAN]()[Critical Angle / Total Internal Reflection CalculatorVERIFIED CLEAN]()[Cyclotron Motion CalculatorVERIFIED CLEAN]()[Damped Harmonic Oscillator CalculatorVERIFIED WITH ERRATA]()[de Broglie Wavelength CalculatorVERIFIED CLEAN]()[Diffraction Grating CalculatorVERIFIED CLEAN]()[Doppler Effect Calculator (sound)VERIFIED WITH ERRATA]()[Double-Slit / Single-Slit Diffraction CalculatorVERIFIED CLEAN]()[Driven Oscillator / Resonance Curve CalculatorVERIFIED WITH ERRATA]()[Elastic/Spring Potential Energy CalculatorVERIFIED CLEAN]()[Electric Field from Point Charge(s) CalculatorVERIFIED CLEAN]()[Electric Potential (Point Charges) CalculatorVERIFIED CLEAN]()[Escape Velocity CalculatorVERIFIED CLEAN]()[Force on a Current-Carrying Wire in a FieldVERIFIED CLEAN]()[Friction Force CalculatorVERIFIED CLEAN]()[Gravitational Potential Energy CalculatorVERIFIED CLEAN]()[Gyroscopic Precession CalculatorVERIFIED CLEAN]()[Hohmann Transfer Orbit CalculatorVERIFIED WITH ERRATA]()[Hooke's Law Spring Force CalculatorVERIFIED CLEAN]()[Impulse-Momentum CalculatorVERIFIED CLEAN]()[Inclined Plane SolverVERIFIED CLEAN]()[Kepler's Third Law CalculatorVERIFIED WITH ERRATA]()[Kinetic Energy CalculatorVERIFIED CLEAN]()[Length Contraction CalculatorVERIFIED CLEAN]()[Local Gravitational Acceleration at AltitudeVERIFIED CLEAN]()[Lorentz Force CalculatorVERIFIED CLEAN]()[Magnetic Field of a Current Loop / Solenoid CalculatorVERIFIED CLEAN]()[Malus's Law Polarization CalculatorVERIFIED CLEAN]()[Mass-Energy Equivalence Calculator (E=mc²)VERIFIED CLEAN]()[Maxwell-Boltzmann Speed Distribution CalculatorVERIFIED CLEAN]()[Moment of Inertia Lookup & CalculatorVERIFIED CLEAN]()[Momentum CalculatorVERIFIED CLEAN]()[Newton's Law of Gravitation CalculatorVERIFIED CLEAN]()[Newton's Second Law / Free-Body Force SolverVERIFIED CLEAN]()[Nuclear Binding Energy CalculatorVERIFIED CLEAN]()[Parallel Plate Capacitor Field/Energy CalculatorVERIFIED CLEAN]()[Photoelectric Effect CalculatorVERIFIED CLEAN]()[Photon Energy & Momentum CalculatorVERIFIED CLEAN]()[Physical (Compound) Pendulum Period CalculatorVERIFIED CLEAN]()[Power CalculatorVERIFIED CLEAN]()[Projectile Range & Trajectory PlotterVERIFIED CLEAN]()[Projectile with Air Drag (numeric)VERIFIED CLEAN]()[Radioactive Decay Chain SimulatorVERIFIED WITH ERRATA]()[Ray Diagram Plotter (lens/mirror)VERIFIED WITH ERRATA]()[Relativistic Doppler Effect CalculatorVERIFIED CLEAN]()[Relativistic Momentum & Kinetic Energy CalculatorVERIFIED CLEAN]()[Relativistic Velocity Addition CalculatorVERIFIED CLEAN]()[Rolling Without Slipping SolverVERIFIED CLEAN]()[Rotational Kinematics SolverVERIFIED CLEAN]()[Rotational Kinetic Energy CalculatorVERIFIED CLEAN]()[Simple Pendulum Period CalculatorVERIFIED CLEAN]()[Snell's Law Refraction CalculatorVERIFIED CLEAN]()[Sound Intensity & Decibel Level CalculatorVERIFIED CLEAN]()[Spherical Mirror Equation CalculatorVERIFIED CLEAN]()[Spring-Mass SHM CalculatorVERIFIED CLEAN]()[Standing Wave Harmonics Calculator (strings & pipes)VERIFIED CLEAN]()[Stefan-Boltzmann Radiated Power CalculatorVERIFIED CLEAN]()[Thin Lens Equation CalculatorVERIFIED CLEAN]()[Time Dilation CalculatorVERIFIED CLEAN]()[Torque CalculatorVERIFIED CLEAN]()[Two-Body Barycenter / Reduced Mass CalculatorVERIFIED CLEAN]()[Uniform Circular Motion CalculatorVERIFIED CLEAN]()[Unit Converter — Physics QuantitiesVERIFIED CLEAN]()[Vis-Viva / Elliptical Orbit Energy CalculatorVERIFIED CLEAN]()[Wave Speed / Wavelength / Frequency CalculatorVERIFIED CLEAN]()[Wien's Displacement Law CalculatorVERIFIED CLEAN]()[Work-Energy Theorem CalculatorVERIFIED CLEAN]() ## Thermodynamics & Energy 1 [Ideal Gas Law SolverVERIFIED CLEAN]() ## Thermodynamics, Fluids & Aero 63 [Airfoil Lift-to-Drag Polar PlotterVERIFIED CLEAN]()[Airspeed Converter (IAS/CAS/TAS/EAS)VERIFIED CLEAN]()[Bernoulli Equation SolverVERIFIED CLEAN]()[Biot Number / Lumped Capacitance Validity CheckVERIFIED CLEAN]()[Boundary Layer Thickness Estimator (Flat Plate)VERIFIED CLEAN]()[Brayton Cycle Efficiency CalculatorVERIFIED CLEAN]()[Breguet Range Equation CalculatorVERIFIED CLEAN]()[Carnot Efficiency CalculatorVERIFIED CLEAN]()[Choked Flow / Nozzle Mass Flow CalculatorVERIFIED WITH ERRATA]()[Colebrook-White / Moody Friction Factor SolverVERIFIED CLEAN]()[Combined/Boyle's/Charles's/Gay-Lussac's Law CalculatorVERIFIED CLEAN]()[Composite Wall R-value / U-value CalculatorVERIFIED CLEAN]()[Compressibility Factor (Z) EstimatorVERIFIED CLEAN]()[Convection Coefficient (Nu Correlation) EstimatorVERIFIED CLEAN]()[Converging-Diverging Nozzle Area-Ratio CalculatorVERIFIED WITH ERRATA]()[Cooling Tower Approach/Range CalculatorVERIFIED CLEAN]()[Cylindrical/Spherical Conduction Resistance CalculatorVERIFIED CLEAN]()[Darcy-Weisbach Pressure Drop CalculatorVERIFIED WITH ERRATA]()[Diesel Cycle Efficiency CalculatorVERIFIED CLEAN]()[Dimensionless Numbers PanelVERIFIED CLEAN]()[Drag Force / Drag Coefficient CalculatorVERIFIED CLEAN]()[Dual (Sabathé) Cycle Efficiency CalculatorVERIFIED CLEAN]()[Fin Effectiveness/Efficiency CalculatorVERIFIED CLEAN]()[Fluid Property Lookup (Water/Air/Common Fluids)VERIFIED CLEAN]()[Fourier Conduction (Plane Wall) CalculatorVERIFIED CLEAN]()[Humidity Ratio CalculatorVERIFIED CLEAN]()[HVAC Sensible/Latent Load CalculatorVERIFIED CLEAN]()[Isentropic Flow Relations CalculatorVERIFIED CLEAN]()[Isothermal / Adiabatic / Polytropic Process CalculatorVERIFIED CLEAN]()[Lift Coefficient / Lift Force CalculatorVERIFIED CLEAN]()[LMTD Heat Exchanger CalculatorVERIFIED CLEAN]()[Mach Number CalculatorVERIFIED CLEAN]()[Minor Losses (K-factor) CalculatorVERIFIED CLEAN]()[Moist Air Enthalpy CalculatorVERIFIED CLEAN]()[Mollier (h-s) Diagram PlotterVERIFIED CLEAN]()[Natural Convection (Rayleigh/Grashof) CalculatorVERIFIED CLEAN]()[Normal Shock Relations CalculatorVERIFIED WITH ERRATA]()[NPSH Available CalculatorVERIFIED CLEAN]()[NTU-Effectiveness Heat Exchanger CalculatorVERIFIED WITH ERRATA]()[Oblique Shock CalculatorVERIFIED WITH ERRATA]()[Orifice Flow Meter CalculatorVERIFIED WITH ERRATA]()[Otto Cycle Efficiency CalculatorVERIFIED CLEAN]()[Overall Heat Transfer Coefficient (U) CalculatorVERIFIED WITH ERRATA]()[Pipe System Pressure Drop (Series Network) CalculatorVERIFIED CLEAN]()[Psychrometric Chart ToolVERIFIED WITH ERRATA]()[Pump Affinity Laws CalculatorVERIFIED CLEAN]()[Pump Hydraulic Power CalculatorVERIFIED CLEAN]()[Radiation Heat Transfer CalculatorVERIFIED WITH ERRATA]()[Rankine Cycle Efficiency CalculatorVERIFIED CLEAN]()[Relative Humidity ↔ Dew Point ConverterVERIFIED CLEAN]()[Reynolds Number CalculatorVERIFIED CLEAN]()[Specific Heat Ratio (γ) / Cp,Cv LookupVERIFIED CLEAN]()[Sphere/Cylinder Drag Coefficient vs Reynolds CorrelationVERIFIED CLEAN]()[Stagnation Properties Calculator (Compressible Flow)VERIFIED CLEAN]()[Standard Atmosphere (ISA) CalculatorVERIFIED CLEAN]()[Steam Quality (Dryness Fraction) CalculatorVERIFIED CLEAN]()[Steam Table Property LookupVERIFIED CLEAN]()[Stirling Cycle Efficiency CalculatorVERIFIED CLEAN]()[Stokes' Law Settling Velocity CalculatorVERIFIED CLEAN]()[Transient Conduction (Lumped Capacitance) CalculatorVERIFIED CLEAN]()[Van der Waals Real-Gas EOS SolverVERIFIED CLEAN]()[Venturi Flow Meter CalculatorVERIFIED CLEAN]()[Wet-Bulb Temperature EstimatorVERIFIED CLEAN]() ## Multi-instrument workflows Twenty-seven source-defined combinations connect verified instruments into larger jobs while preserving the handoff and cross-check at each step. [Orbital Mission Planner8 instruments]()[Telescope Night Kit8 instruments]()[Metabolic Health Suite10 instruments]()[Renal Dosing Chain (education)8 instruments]()[Buffer Bench8 instruments]()[Reaction Energetics Bench8 instruments]()[Home Renovation Estimator11 instruments]()[Mortgage Suite9 instruments]()[Investor's Valuation Bench8 instruments]()[Startup Unit Economics7 instruments]()[Audio Engineer's Rack11 instruments]()[Music Timing & Pitch Kit8 instruments]()[Photographer's Exposure Bench9 instruments]()[Video Pipeline Kit6 instruments]()[Electronics Power-Rail Designer9 instruments]()[Off-Grid Solar Designer7 instruments]()[Motor & Drivetrain Bench10 instruments]()[Beam & Column Structural Bench12 instruments]()[Heat-Transfer Path10 instruments]()[Pipe & Pump Bench8 instruments]()[Engine Cycle Comparator7 instruments]()[Crypto & Number Theory Classroom11 instruments]()[Network Planner6 instruments]()[Running Coach Kit6 instruments]()[Pregnancy & Cycle Suite4 instruments]()[Weather Station9 instruments]()[Kinematics & Collisions Tutor14 instruments]() ## Sources and evidence These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment. - `VERIFIED_LEDGER.json · sha256 af84e2f33f491aa8664484d8c8856cfb2e7485b093a1c53bbd795b5f4a748948` - `STRESS_TEST_RECEIPT.json` - `BOUNDARY_HAZARD_CATALOG.json` - `INSTRUMENT_COMBOS.json` ## Related routes - [index]() - [agents/stan]() - [products/guth-notebook]() - [products/pointguard]()