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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: observedLifecycle: verified-ledger
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.
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Audio, Music, Photography & Color 64
Absorption/Reflection Coefficient Lookup (Acoustic Materials)VERIFIED CLEANAspect Ratio / Crop CalculatorVERIFIED CLEANAudio File Size EstimatorVERIFIED CLEANBeat/Measure Duration & Song Length EstimatorVERIFIED CLEANBit Depth Dynamic Range CalculatorVERIFIED CLEANBit Rate ↔ File Size for Audio Codecs (MP3/AAC/FLAC estimate)VERIFIED CLEANBlackbody Color Temperature → RGB ApproximationVERIFIED CLEANBPM Tap TempoVERIFIED CLEANCents / Pitch Deviation CalculatorVERIFIED CLEANChord Progression / Roman Numeral AnalyzerVERIFIED CLEANColor Temperature Mired Shift CalculatorVERIFIED CLEANComb Filtering / Phase Cancellation PredictorVERIFIED CLEANComplementary / Analogous / Triadic Color Scheme GeneratorVERIFIED CLEANData Rate / Storage Planner (Camera Codecs)VERIFIED CLEANdB SPL / dBu / dBV ConverterVERIFIED CLEANDelay Time from BPM (Musical Note Divisions)VERIFIED CLEANDepth of Field / Hyperfocal Distance CalculatorVERIFIED CLEANDiffraction Limit / Optimal Aperture CalculatorVERIFIED CLEANExposure Bracketing / HDR Stops PlannerVERIFIED CLEANExposure Triangle / EV CalculatorVERIFIED CLEANExposure Value (EV) to Lux/Foot-candle ConverterVERIFIED CLEANField of View Calculator (Sensor + Focal Length)VERIFIED CLEANFlash Guide Number CalculatorVERIFIED CLEANFocal Length Equivalent / Crop Factor ConverterVERIFIED CLEANFrame Rate Conversion / Pulldown CalculatorVERIFIED CLEANGain Staging / dB Sum CalculatorVERIFIED CLEANGamut Coverage / Color Space Notes PanelVERIFIED CLEANGolden Hour / Sun Position CalculatorVERIFIED WITH ERRATAGuitar Capo ChartVERIFIED CLEANHarmonic Series ExplorerVERIFIED CLEANHex ↔ RGB ↔ HSL ↔ LAB Color ConverterVERIFIED CLEANInterval / Chord / Scale Reference BuilderVERIFIED CLEANLatency / Buffer Size CalculatorVERIFIED CLEANLoudness Unit (LUFS) Reference / Target CheckerVERIFIED CLEANMetronome Click Track Export (Tempo Map)VERIFIED CLEANMetronome PanelVERIFIED CLEANMicrophone Polar Pattern / Proximity Effect ReferenceVERIFIED CLEANMIDI Note Number ↔ Note Name ConverterVERIFIED CLEANMotion Blur / Panning Shutter Speed EstimatorVERIFIED WITH ERRATAND Filter Stop / Exposure Time CalculatorVERIFIED CLEANNote Frequency Reference (A4 Tuning Offset)VERIFIED CLEANPan Law / Stereo Balance Level CalculatorVERIFIED CLEANPanorama Stitching Field-of-View PlannerVERIFIED CLEANPassive Crossover Frequency CalculatorVERIFIED CLEANPrint DPI / Size CalculatorVERIFIED CLEANPrint vs Screen Color Gamut Warning (Simplified)VERIFIED CLEANReciprocity Failure Calculator (Film)VERIFIED CLEANReverb Time RT60 (Sabine Formula)VERIFIED CLEANRoom Modes Calculator (Axial)VERIFIED CLEANSafe Area / Title-Safe Overlay CalculatorVERIFIED CLEANSample Rate / Nyquist Frequency CheckerVERIFIED CLEANSemitone/Cents Ratio ↔ Playback Speed (Pitch/Time) CalculatorVERIFIED CLEANSound Level Distance Attenuation (Inverse Square Law)VERIFIED CLEANSpeaker Impedance Load Calculator (Series/Parallel)VERIFIED CLEANStar Trail / Astro Exposure (500 Rule / NPF Rule)VERIFIED CLEANString/Wind Instrument Fundamental Frequency (String Length)VERIFIED CLEANSunny 16 / Exposure Rule-of-Thumb PanelVERIFIED CLEANTempo ↔ Milliseconds ConverterVERIFIED CLEANTime-Lapse Interval CalculatorVERIFIED CLEANTimecode Math CalculatorVERIFIED CLEANTransposition CalculatorVERIFIED CLEANVideo Bitrate / File Size CalculatorVERIFIED CLEANWavelength ↔ Frequency (Sound) ConverterVERIFIED CLEANWCAG Contrast Ratio CheckerVERIFIED CLEAN
Biology, Medicine & Health 1
Biology, Medicine & Pharmacology 5
Biology, Medicine & Pharmacology (educational estimates only — every panel labeled not-medical-advice) 82
A1C to Estimated Average Glucose ConverterVERIFIED CLEANAbsorbance-to-Concentration (Beer-Lambert)VERIFIED CLEANAdult Growth Chart / Height PercentileVERIFIED CLEANAlcohol Unit / Standard Drink CounterVERIFIED CLEANAllele/Genotype Frequency from Pedigree CountsVERIFIED CLEANAnion Gap CalculatorVERIFIED CLEANAntibiotic Dilution / MIC Reference Calculator (education)VERIFIED CLEANApgar Score Reference SheetVERIFIED CLEANBasal Insulin / Carb Ratio Reference (education)VERIFIED CLEANBasal Metabolic Rate → Weight Change ProjectorVERIFIED CLEANBilirubin/Jaundice Risk Reference (education)VERIFIED CLEANBlood Alcohol Concentration (Widmark estimate)VERIFIED CLEANBlood Type / Transfusion Compatibility ReferenceVERIFIED CLEANCaffeine Half-Life / Level TrackerVERIFIED CLEANCaloric Content / Macronutrient CalculatorVERIFIED CLEANCardiac Output & Related HemodynamicsVERIFIED CLEANCell Counting / Hemocytometer CalculatorVERIFIED CLEANCell/Bacterial Doubling Time CalculatorVERIFIED CLEANChi-Square Goodness-of-Fit (Genetics)VERIFIED CLEANCircadian Phase / Jet Lag Adjustment EstimatorVERIFIED CLEANCodon/DNA-RNA-Protein TranslatorVERIFIED CLEANCorrected Calcium / Sodium CalculatorVERIFIED CLEANCreatinine Clearance (Cockcroft-Gault)VERIFIED CLEANCulture Media / Buffer Recipe ScalerVERIFIED CLEANDiffusion Time / Fick's Law Estimator (biological scale)VERIFIED CLEANDNA/RNA/Protein Molecular Weight CalculatorVERIFIED CLEANDrug Half-Life Accumulation / EliminationVERIFIED CLEANeGFR (CKD-EPI 2021, race-free)VERIFIED CLEANeGFR (MDRD, legacy)VERIFIED CLEANEnzyme Inhibition Type ComparatorVERIFIED CLEANEnzyme Kinetics (Michaelis-Menten) SolverVERIFIED CLEANFramingham-style Cardiovascular Risk Score (education)VERIFIED CLEANGC Content & Sequence Composition AnalyzerVERIFIED CLEANGenetic Linkage / Recombination Frequency CalculatorVERIFIED CLEANGestational Age / EDD from UltrasoundVERIFIED CLEANGlycemic Load CalculatorVERIFIED CLEANHardy-Weinberg Equilibrium CalculatorVERIFIED CLEANHOMA-IR Insulin Resistance Index (education)VERIFIED CLEANIdeal/Adjusted Body WeightVERIFIED CLEANIV Drip Rate CalculatorVERIFIED CLEANKaplan-Meier Survival Curve PlotterVERIFIED CLEANLife Table / Survival Probability CalculatorVERIFIED CLEANLoading & Maintenance Dose CalculatorVERIFIED CLEANLung Capacity Predicted Values (Spirometry Reference)VERIFIED CLEANMean Arterial Pressure & Pulse PressureVERIFIED CLEANMenstrual Cycle Length Tracker/PredictorVERIFIED CLEANMetabolic Equivalent (MET) / Activity Energy CalculatorVERIFIED CLEANMid-Parental Height PredictorVERIFIED CLEANMolarity / Solution Prep CalculatorVERIFIED CLEANng-to-pmol / Copy Number ConverterVERIFIED CLEANNNT/NNH (Number Needed to Treat/Harm)VERIFIED CLEANOne-Compartment PK Simulator (first-order)VERIFIED WITH ERRATAOsmolarity / Tonicity CalculatorVERIFIED CLEANOsmotic Pressure Calculator (van't Hoff)VERIFIED CLEANOvulation & Fertile Window EstimatorVERIFIED CLEANPCR Cycle / Amplification CalculatorVERIFIED CLEANPediatric Growth Percentile LookupVERIFIED CLEANPercent Solution / Concentration Unit ConverterVERIFIED CLEANpH / Henderson-Hasselbalch CalculatorVERIFIED CLEANPopulation Growth: Exponential ModelVERIFIED CLEANPopulation Growth: Logistic ModelVERIFIED CLEANPregnancy Due Date CalculatorVERIFIED CLEANPrimer Melting Temperature (Tm) CalculatorVERIFIED CLEANProtein Concentration (BCA/Bradford standard curve)VERIFIED WITH ERRATAProtein Requirement EstimatorVERIFIED CLEANPunnett Square GeneratorVERIFIED CLEANPunnett-based Trihybrid/Multi-gene Probability CalculatorVERIFIED WITH ERRATAPunnett-derived Carrier Risk Calculator (education)VERIFIED CLEANQTc Interval Calculator (education)VERIFIED CLEANRelative Risk / Odds Ratio CalculatorVERIFIED WITH ERRATARestriction Enzyme Cut Site FinderVERIFIED CLEANReynolds Number for Blood Flow (biofluid mechanics)VERIFIED CLEANSample Size / Power Calculator (clinical study education)VERIFIED CLEANSensitivity/Specificity/PPV/NPV CalculatorVERIFIED CLEANSerial Dilution CalculatorVERIFIED CLEANSmoking Pack-Year CalculatorVERIFIED CLEANTarget Heart Rate ZonesVERIFIED CLEANTitration Curve Simulator (weak acid/base biochem context)VERIFIED CLEANVO2max Estimator (non-exercise / walk test)VERIFIED CLEANWaist-to-Hip / Waist-to-Height RatioVERIFIED CLEANWater Intake / Hydration EstimatorVERIFIED CLEANWeight-Based Dosage Calculator (education)VERIFIED CLEAN
Chemistry & Materials 66
Alloy Density Rule-of-Mixtures CalculatorVERIFIED CLEANArrhenius Equation CalculatorVERIFIED WITH ERRATAArrhenius Plot (ln k vs 1/T) ToolVERIFIED WITH ERRATABeer–Lambert Law (Absorbance) CalculatorVERIFIED CLEANBond Enthalpy Reaction EstimatorVERIFIED CLEANBuffer Capacity EstimatorVERIFIED CLEANBuffer Preparation CalculatorVERIFIED WITH ERRATACalorimetry Calculator (q=mcΔT)VERIFIED CLEANChemistry Unit & Constants ConverterVERIFIED CLEANColligative Properties SuiteVERIFIED CLEANCombined/Combined-Gas-Law CalculatorVERIFIED CLEANCombustion Analysis SolverVERIFIED WITH ERRATADalton's Law / Partial Pressure CalculatorVERIFIED CLEANDilution Calculator (C1V1=C2V2)VERIFIED CLEANElectronegativity Difference / Bond Type PredictorVERIFIED CLEANEmpirical & Molecular Formula FinderVERIFIED CLEANFaraday's Law Electrolysis CalculatorVERIFIED CLEANGalvanic / Corrosion Series LookupVERIFIED CLEANGas Stoichiometry / Molar Volume CalculatorVERIFIED CLEANGeneral Equilibrium ICE-Table SolverVERIFIED WITH ERRATAGibbs Free Energy / Spontaneity CalculatorVERIFIED CLEANGraham's Law Effusion/Diffusion CalculatorVERIFIED CLEANHalf-Life Calculator (multi-order)VERIFIED CLEANHardness Scale Converter (HRC/HB/HV/HRB/Mohs)VERIFIED CLEANHenderson–Hasselbalch Buffer CalculatorVERIFIED CLEANHess's Law Enthalpy CalculatorVERIFIED CLEANIdeal Gas Law CalculatorVERIFIED CLEANIntegrated Rate Law SolverVERIFIED CLEANIsotope / Average Atomic Mass CalculatorVERIFIED CLEANKa/Kb ⇄ pKa/pKb ConverterVERIFIED CLEANKc ⇄ Kp ConverterVERIFIED CLEANKsp Solubility CalculatorVERIFIED CLEANLe Chatelier Shift PredictorVERIFIED CLEANLewis Structure / Formal Charge HelperVERIFIED CLEANMolality CalculatorVERIFIED CLEANMolar Mass / Formula Mass CalculatorVERIFIED WITH ERRATAMolarity CalculatorVERIFIED CLEANMole Fraction / Mole Percent CalculatorVERIFIED CLEANNernst Equation CalculatorVERIFIED CLEANNormality / Equivalents CalculatorVERIFIED CLEANOsmolarity / Osmolality CalculatorVERIFIED CLEANPercent Composition CalculatorVERIFIED CLEANPercent Solution / Concentration-Unit ConverterVERIFIED CLEANPercent Yield CalculatorVERIFIED CLEANPeriodic Table Interactive Lookup PanelVERIFIED CLEANpH / pOH CalculatorVERIFIED CLEANPhase Diagram Lever Rule CalculatorVERIFIED CLEANPolymer Glass Transition Temperature (Tg) LookupVERIFIED CLEANRadioactive Decay / Half-Life CalculatorVERIFIED CLEANRate Law / Reaction-Order DeterminerVERIFIED CLEANReaction Quotient (Q) vs Kc/Kp ComparatorVERIFIED WITH ERRATAReaction Stoichiometry / Limiting Reagent SolverVERIFIED CLEANRedox Half-Reaction BalancerVERIFIED CLEANSolution Mixing / Neutralization CalculatorVERIFIED CLEANStandard Cell Potential (E°cell) CalculatorVERIFIED CLEANStandard Enthalpy of Reaction (ΔH°f) CalculatorVERIFIED CLEANStandard Entropy of Reaction CalculatorVERIFIED CLEANStandard Reduction Potential / Activity Series LookupVERIFIED CLEANTitration Curve PlotterVERIFIED WITH ERRATATitration Equivalence-Point CalculatorVERIFIED CLEANUnit Cell Density CalculatorVERIFIED CLEANVan der Waals Real-Gas CalculatorVERIFIED WITH ERRATAVan't Hoff Factor EstimatorVERIFIED CLEANVSEPR Geometry PredictorVERIFIED CLEANWater Hardness Calculator (ppm CaCO3)VERIFIED CLEANWeak Acid/Base Ionization Solver (ICE table)VERIFIED CLEAN
Computing & Digital Systems 1
Computing & Information 66
Algorithm Runtime EstimatorVERIFIED CLEANAmdahl's Law / Parallel Speedup CalculatorVERIFIED CLEANBase Encoding Size Calculator (Text/Data Bloat)VERIFIED CLEANBase Frequency Analyzer (Cryptanalysis Teaching Tool)VERIFIED CLEANBase64 / URL Encoding ConverterVERIFIED CLEANBig Integer Base-N ArithmeticVERIFIED CLEANBig-O Growth Comparison PlotterVERIFIED CLEANBinary Search / Sorted-Array Step VisualizerVERIFIED CLEANBinary Tree / Heap Visualizer & Property CalculatorVERIFIED CLEANBinary/Text Diff & Similarity RatioVERIFIED CLEANBitmask / Flag BuilderVERIFIED CLEANBitwise Operations CalculatorVERIFIED CLEANBloom Filter Sizing CalculatorVERIFIED CLEANBoolean Logic Truth Table GeneratorVERIFIED CLEANCaesar / Substitution Cipher ToolVERIFIED CLEANCharacter Encoding Converter (UTF-8/16/32, Latin-1)VERIFIED CLEANChecksum VerifierVERIFIED CLEANCIDR / Subnet CalculatorVERIFIED CLEANColor Code ConverterVERIFIED WITH ERRATACompression Ratio CalculatorVERIFIED CLEANConsistent Hashing Ring VisualizerVERIFIED CLEANCPU Cache Hit-Rate / AMAT CalculatorVERIFIED CLEANCPU Clock Cycle / IPC Performance CalculatorVERIFIED CLEANCron Expression ExplainerVERIFIED CLEANData Structure Memory Footprint EstimatorVERIFIED CLEANDatabase Index Selectivity / Cardinality EstimatorVERIFIED CLEANdBFS / Audio Level CalculatorVERIFIED CLEANDiffie-Hellman Key Exchange ToyVERIFIED CLEANDSP: Sample Rate & Nyquist CalculatorVERIFIED CLEANFFT Bin Width / Frequency Resolution CalculatorVERIFIED CLEANFinite State Machine SimulatorVERIFIED CLEANGPU VRAM vs Model Size LadderVERIFIED CLEANGraph Shortest-Path Calculator (Dijkstra)VERIFIED CLEANHamming Distance / Error-Detection CalculatorVERIFIED CLEANHTTP Status Code / Header LookupVERIFIED CLEANIEEE-754 Float InspectorVERIFIED CLEANIPv6 Address ExplorerVERIFIED CLEANJSON/XML Size & Depth AnalyzerVERIFIED WITH ERRATALatency / Bandwidth / Transfer-Time CalculatorVERIFIED CLEANLevenshtein / Edit Distance CalculatorVERIFIED CLEANLoad Balancer / Queueing Wait-Time Estimator (M/M/1)VERIFIED CLEANLogic Gate Circuit Simulator (Basic)VERIFIED CLEANLuhn Algorithm Checksum Validator (Educational)VERIFIED CLEANModular Exponentiation CalculatorVERIFIED CLEANMTBF / MTTR / Reliability CalculatorVERIFIED CLEANMTU / Packet Fragmentation CalculatorVERIFIED CLEANNetwork Speed Test Result InterpreterVERIFIED CLEANParity Bit / Simple ECC DemoVERIFIED CLEANPassword / Passphrase Entropy EstimatorVERIFIED WITH ERRATAPrimality TesterVERIFIED CLEANQR Code Payload Size EstimatorVERIFIED CLEANRAID Capacity & Fault-Tolerance CalculatorVERIFIED CLEANRegex TesterVERIFIED CLEANRSA Toy Cipher (Educational)VERIFIED CLEANSample/Bit-Rate File Size EstimatorVERIFIED CLEANSHA-256 / Hash Function DemoVERIFIED CLEANShannon Entropy / Information Content CalculatorVERIFIED CLEANStorage Unit ConverterVERIFIED CLEANSubnet Splitter / VLSM PlannerVERIFIED CLEANTime Complexity Comparator for Sorting AlgorithmsVERIFIED CLEANTime Complexity of Recursive Algorithm (Master Theorem Solver)VERIFIED CLEANToken / Context-Window Cost CalculatorVERIFIED CLEANTwo's Complement CalculatorVERIFIED CLEANUnicode / ASCII Code Point LookupVERIFIED CLEANUptime / SLA Availability CalculatorVERIFIED CLEANURL / Query String ParserVERIFIED CLEAN
Earth & Space 5
Earth & Space (astronomy, orbital mechanics, meteorology, geology, geodesy, oceanography) 76
Absolute Magnitude of Solar System Body (H) ↔ DiameterVERIFIED CLEANAir Density CalculatorVERIFIED CLEANAngular Size ↔ Physical SizeVERIFIED CLEANApparent Stellar Motion / Proper Motion ProjectorVERIFIED CLEANAstronomical Twilight DurationVERIFIED WITH ERRATABarometric Formula (Pressure vs Altitude, general)VERIFIED CLEANBeaufort Wind Scale LookupVERIFIED CLEANBeaufort-to-Wave-Height Sea StateVERIFIED CLEANCAPE Estimator (simplified)VERIFIED CLEANCircular Orbital VelocityVERIFIED CLEANCloud Base Height from Spread (quick field rule)VERIFIED CLEANCoordinate Format Converter (multi)VERIFIED CLEANCoriolis Deflection EstimatorVERIFIED CLEANDeep-Water Wave Speed & PeriodVERIFIED CLEANDew Point CalculatorVERIFIED CLEANDMS ↔ Decimal DegreesVERIFIED CLEANEarthquake Magnitude Comparison (energy ratio)VERIFIED CLEANEscape VelocityVERIFIED CLEANExoplanet Transit DepthVERIFIED CLEANGeologic Strain/Dip-Strike HelperVERIFIED CLEANGeothermal Gradient / Depth-TemperatureVERIFIED CLEANGreat Lapse Rate / Adiabatic CoolingVERIFIED CLEANGreat-Circle Distance (Haversine)VERIFIED CLEANGround Track / Orbital Period vs AltitudeVERIFIED CLEANHabitable-Zone Distance (rough)VERIFIED CLEANHaversine Sunrise-Azimuth Bearing (great circle course)VERIFIED CLEANHeat Index (Apparent Temperature)VERIFIED CLEANHohmann Transfer Delta-VVERIFIED CLEANHR Diagram PlotterVERIFIED CLEANHydraulic Conductivity / Darcy FluxVERIFIED CLEANJulian Date ConverterVERIFIED CLEANKöppen Climate Classifier (rough)VERIFIED CLEANLat/Lon ↔ UTM ConverterVERIFIED WITH ERRATALifting Condensation Level (LCL) HeightVERIFIED CLEANLight Travel TimeVERIFIED CLEANLimiting Magnitude EstimatorVERIFIED CLEANLuminosity from Radius & TemperatureVERIFIED CLEANMagnetic Declination LookupVERIFIED CLEANMoon Phase CalculatorVERIFIED CLEANMoonrise/Moonset EstimatorVERIFIED CLEANOrbital Eccentricity/Apsides SolverVERIFIED CLEANOrbital Inclination Plane-Change ΔvVERIFIED CLEANOrbital Period (Kepler's 3rd Law)VERIFIED CLEANPlate Motion Rate & Distance ProjectorVERIFIED CLEANPorosity CalculatorVERIFIED CLEANPressure Altitude / Density AltitudeVERIFIED CLEANRadiocarbon (C-14) Age with Calibration NoteVERIFIED CLEANRadiometric Dating CalculatorVERIFIED CLEANRedshift ↔ Velocity/DistanceVERIFIED CLEANRelative Humidity from Wet/Dry BulbVERIFIED CLEANRichter/Moment Magnitude ↔ Seismic EnergyVERIFIED CLEANRip Current Risk Rough EstimatorVERIFIED CLEANRocket Equation (Tsiolkovsky)VERIFIED WITH ERRATASaffir-Simpson Hurricane CategoryVERIFIED CLEANSeawater Density (simplified EOS)VERIFIED CLEANShallow-Water Wave Speed & Breaking DepthVERIFIED CLEANSidereal vs Solar Time ConverterVERIFIED CLEANSolar Elevation Shadow-Length CalculatorVERIFIED CLEANSolar Position (Sun Az/Alt)VERIFIED CLEANStandard Atmosphere Lapse Rate ModelVERIFIED CLEANStream/Sediment Settling Velocity (Stokes)VERIFIED CLEANSunrise/Sunset CalculatorVERIFIED CLEANSynodic Period CalculatorVERIFIED CLEANTelescope Field of ViewVERIFIED CLEANTelescope MagnificationVERIFIED CLEANTelescope Resolving Power (Dawes/Rayleigh)VERIFIED CLEANTime Zone / Local Solar Time OffsetVERIFIED CLEANTransit Duration & Impact ParameterVERIFIED CLEANUV Index Exposure Time EstimatorVERIFIED CLEANVincenty Ellipsoidal DistanceVERIFIED WITH ERRATAVis-Viva Equation SolverVERIFIED CLEANWave Energy Flux EstimatorVERIFIED CLEANWentworth Grain-Size ClassifierVERIFIED CLEANWien's Law Peak WavelengthVERIFIED CLEANWind ChillVERIFIED CLEANWind Speed Unit/Force ConverterVERIFIED CLEAN
Electrical & Electronics 1
Electrical & Electronics Engineering 4
Electrical & Electronics Engineering — Circuits, Power Systems, Electronics Lab 82
555 Timer Astable/Monostable CalculatorVERIFIED CLEANAC Power Triangle CalculatorVERIFIED CLEANAntenna Length Calculator (dipole/monopole/whip)VERIFIED CLEANArc Flash Incident Energy Estimator (simplified IEEE 1584-style)VERIFIED CLEANBattery Capacity / C-Rate / Runtime CalculatorVERIFIED CLEANBattery Charge Time EstimatorVERIFIED CLEANBattery Pack Series/Parallel ConfiguratorVERIFIED CLEANBJT Amplifier Gain Estimator (Common-Emitter)VERIFIED WITH ERRATABJT Bias Point Calculator (Voltage Divider Bias)VERIFIED WITH ERRATABode Plot Generator (generic transfer function)VERIFIED CLEANCapacitor Code DecoderVERIFIED CLEANCapacitor Energy & Charge CalculatorVERIFIED CLEANCapacitor Series/Parallel CombinerVERIFIED CLEANClass A/B/AB Amplifier Efficiency & Dissipation EstimatorVERIFIED CLEANCoax Cable Loss & Power Handling EstimatorVERIFIED CLEANCrystal Oscillator Load Capacitance CalculatorVERIFIED CLEANDC Motor Starting Current & Back-EMF EstimatorVERIFIED CLEANDecibel (dB) ConverterVERIFIED CLEANDecoupling Capacitor SelectorVERIFIED WITH ERRATADiode Bridge Rectifier Loss EstimatorVERIFIED CLEANDuty Cycle / PWM Average Voltage CalculatorVERIFIED CLEANElectrical Safety / Shock Current ReferenceVERIFIED CLEANEMC/EMI Near-Field Distance & Wavelength CalculatorVERIFIED CLEANFilter Designer — Active Sallen-Key (2nd order)VERIFIED CLEANFilter Designer — Higher-Order (Butterworth/Chebyshev) Response PlotterVERIFIED CLEANFilter Designer — RC Low-Pass/High-PassVERIFIED CLEANFuse/Breaker Trip Time Curve ViewerVERIFIED CLEANGenerator Sizing Calculator (backup power)VERIFIED CLEANGround Loop / Common-Impedance Voltage EstimatorVERIFIED CLEANHeat Sink Thermal Resistance CalculatorVERIFIED CLEANImpedance Matching Network Designer (L-network)VERIFIED CLEANInduction Motor Slip & Speed CalculatorVERIFIED CLEANInductor Energy CalculatorVERIFIED CLEANInductor Series/Parallel CombinerVERIFIED CLEANInrush Current / Fuse & Breaker Sizing EstimatorVERIFIED CLEANkWh Cost / Energy Bill EstimatorVERIFIED CLEANLED Series Resistor CalculatorVERIFIED CLEANLinear Regulator Power Dissipation & Heatsink NeedVERIFIED CLEANMaterials Resistivity/Conductivity TableVERIFIED CLEANMOSFET Switching Power Loss EstimatorVERIFIED WITH ERRATAMotor Torque/Power/Speed ConverterVERIFIED CLEANMutual Inductance / Coupled Coil CalculatorVERIFIED CLEANNEC/IEC Conduit Fill CalculatorVERIFIED CLEANNyquist / Wien Bridge Oscillator Frequency CalculatorVERIFIED CLEANOff-Grid Battery Bank Sizing (Solar)VERIFIED CLEANOp-Amp Bandwidth / Gain-Bandwidth Product CheckerVERIFIED CLEANOp-Amp Gain Calculator (Inverting/Non-inverting/Diff)VERIFIED CLEANOp-Amp Noise Estimator (input-referred)VERIFIED CLEANOp-Amp Summing/Integrator/Differentiator DesignerVERIFIED CLEANPCB Trace Impedance Calculator (Microstrip/Stripline)VERIFIED CLEANPCB Trace Resistance & Voltage DropVERIFIED CLEANPCB Trace Width Calculator (IPC-2221)VERIFIED CLEANPCB Via Current Capacity CalculatorVERIFIED CLEANPhasor / Impedance CalculatorVERIFIED CLEANPhysical Constants ReferenceVERIFIED CLEANPower Factor Correction Capacitor SizerVERIFIED CLEANRectifier/DC Power Supply Ripple CalculatorVERIFIED CLEANResistor Color Code Decoder/EncoderVERIFIED CLEANSample Rate / Nyquist & ADC Resolution CalculatorVERIFIED WITH ERRATASchmitt Trigger Threshold CalculatorVERIFIED WITH ERRATAShort-Circuit Fault Current Estimator (simplified)VERIFIED CLEANShot Noise CalculatorVERIFIED CLEANSignal-to-Noise Ratio / SINAD / ENOB CalculatorVERIFIED WITH ERRATASkin Effect / Skin Depth CalculatorVERIFIED CLEANSolar Charge Controller Sizing (PWM/MPPT)VERIFIED CLEANSolar PV Array Sizing CalculatorVERIFIED CLEANSpeaker/Load Impedance Matching CalculatorVERIFIED CLEANStandard Value Finder (E-series)VERIFIED CLEANSwitching Regulator (Boost) Component CalculatorVERIFIED WITH ERRATASwitching Regulator (Buck) Component CalculatorVERIFIED CLEANThermal (Johnson-Nyquist) Noise CalculatorVERIFIED WITH ERRATAThermal Expansion CalculatorVERIFIED CLEANThree-Phase Power CalculatorVERIFIED WITH ERRATATransformer Efficiency & Losses EstimatorVERIFIED CLEANTransformer Turns Ratio & Sizing CalculatorVERIFIED CLEANTransmission Line / SWR CalculatorVERIFIED CLEANUnit Converter (electrical)VERIFIED CLEANVoltage Drop Calculator (wire run)VERIFIED CLEANVoltage Regulator (Linear) Resistor/Output CalculatorVERIFIED CLEANWire Ampacity CalculatorVERIFIED CLEANWire Gauge (AWG/SWG) ↔ Diameter/Area ConverterVERIFIED CLEANZener Diode Regulator Design CalculatorVERIFIED CLEAN
Everyday & Life 63
0-60 mph Estimator (Educational)VERIFIED CLEANAge CalculatorVERIFIED WITH ERRATAAquarium Volume & Stocking CalculatorVERIFIED CLEANBaker's Percentage ConverterVERIFIED CLEANBrine & Marinade Salinity CalculatorVERIFIED CLEANCalories Burned Estimator (MET Tables)VERIFIED CLEANCandy/Sugar Syrup Stage ReferenceVERIFIED CLEANConcrete Volume & Bag CalculatorVERIFIED CLEANCountdown / Days-Until TimerVERIFIED CLEANDate & Duration CalculatorVERIFIED CLEANDeck Board & Joist CalculatorVERIFIED WITH ERRATADilution / Cocktail Proof CalculatorVERIFIED CLEANDrywall Sheet CalculatorVERIFIED CLEANElectricity Cost of Appliance CalculatorVERIFIED CLEANElevation/Altitude Cooking Adjustment CalculatorVERIFIED CLEANEV Charge Time & Cost CalculatorVERIFIED CLEANFence Materials CalculatorVERIFIED CLEANFirewood / Cord CalculatorVERIFIED CLEANFrost Date & Planting Window LookupVERIFIED CLEANFuel Economy CalculatorVERIFIED CLEANGarden Plant Spacing PlannerVERIFIED CLEANGear Ratio / RPM-Speed CalculatorVERIFIED CLEANGPA CalculatorVERIFIED CLEANGrocery Recipe Cost EstimatorVERIFIED CLEANGrout & Adhesive Coverage CalculatorVERIFIED CLEANHeart Rate Zone CalculatorVERIFIED CLEANHousehold Water Usage CalculatorVERIFIED CLEANHydration Needs EstimatorVERIFIED CLEANIngredient Substitution Ratio CalculatorVERIFIED CLEANInsulation/HVAC BTU Load Estimator (Rule of Thumb)VERIFIED CLEANJet Lag PlannerVERIFIED CLEANKitchen Unit & Volume-Weight ConverterVERIFIED CLEANLayover Connection Time CheckerVERIFIED CLEANLeftover/Freshness Countdown TrackerVERIFIED CLEANLumber Board-Foot CalculatorVERIFIED CLEANMeal Prep Portion CalculatorVERIFIED CLEANMortgage vs Rent ComparatorVERIFIED WITH ERRATAMoving Box / Truck Size EstimatorVERIFIED CLEANMulch/Soil/Gravel Volume CalculatorVERIFIED CLEANOne-Rep Max Calculator (Epley/Brzycki)VERIFIED CLEANOven Temperature ConverterVERIFIED CLEANPace / Split CalculatorVERIFIED CLEANPacking Weight CheckerVERIFIED CLEANPaint Coverage CalculatorVERIFIED CLEANRace Time Predictor (Riegel Formula)VERIFIED CLEANReading Time EstimatorVERIFIED CLEANRecipe ScalerVERIFIED CLEANRoad Trip Cost SplitterVERIFIED CLEANRoof Pitch & Rafter CalculatorVERIFIED CLEANRoof/Attic Insulation R-Value CalculatorVERIFIED CLEANSous-Vide Time & Temperature LookupVERIFIED CLEANStair Rise & Run DesignerVERIFIED CLEANTile & Flooring CalculatorVERIFIED CLEANTime Zone ConverterVERIFIED CLEANTip & Bill Split CalculatorVERIFIED CLEANTire Size ComparatorVERIFIED CLEANTravel Currency Tip/Rounding HelperVERIFIED CLEANTrip Fuel Cost CalculatorVERIFIED CLEANTyping WPM / Accuracy CalculatorVERIFIED CLEANUnit Price / Best-Value ComparatorVERIFIED CLEANWallpaper Roll CalculatorVERIFIED CLEANWindow/Door Rough Opening CalculatorVERIFIED CLEANWork Hours / Timesheet CalculatorVERIFIED CLEAN
Finance, Economics & Business 5
Finance, Economics & Business (educational only — never individualized investment, tax, or legal advice) 86
401(k)/IRA Contribution & Match OptimizerVERIFIED CLEAN50/30/20 Budget SplitterVERIFIED CLEANAmortization ScheduleVERIFIED WITH ERRATAAPR vs APY ConverterVERIFIED CLEANBill Split CalculatorVERIFIED CLEANBlack-Scholes Option Price (Educational)VERIFIED CLEANBond Duration & ConvexityVERIFIED CLEANBond Price / YTM CalculatorVERIFIED CLEANBreak-Even & Contribution Margin DashboardVERIFIED CLEANBreak-Even Analysis for Business LoanVERIFIED CLEANBreak-Even Units CalculatorVERIFIED CLEANBurn Rate & Runway CalculatorVERIFIED CLEANCap Table Dilution (Simple)VERIFIED CLEANCAPM Expected ReturnVERIFIED CLEANCar Loan / Total Cost of Ownership CalculatorVERIFIED CLEANClosing Costs & Cash-to-Close EstimatorVERIFIED CLEANCompound Interest VisualizerVERIFIED CLEANCredit Card Payoff PlannerVERIFIED CLEANCurrency Converter (Offline Snapshot)VERIFIED CLEANCurrency-Adjusted Salary Comparator (Cost of Living)VERIFIED CLEANDCF Valuation (Simple)VERIFIED WITH ERRATADebt Avalanche vs SnowballVERIFIED WITH ERRATADebt Service Coverage Ratio (DSCR)VERIFIED CLEANDebt-to-Income Ratio CalculatorVERIFIED CLEANDeclining Balance / Double-Declining DepreciationVERIFIED WITH ERRATADepreciation Calculator (Straight-Line)VERIFIED CLEANDividend Yield & Growth (DDM)VERIFIED CLEANEBITDA / Operating Margin BuilderVERIFIED WITH ERRATAEffective Annual Rate Comparator (Multiple Loans/Cards)VERIFIED CLEANEmergency Fund SizerVERIFIED CLEANEOQ / Inventory Reorder CalculatorVERIFIED WITH ERRATAExchange Rate Pass-Through / Pip Value CalculatorVERIFIED CLEANExtra-Payment Payoff ImpactVERIFIED CLEANGDP Growth Rate CalculatorVERIFIED WITH ERRATAGini Coefficient / Lorenz Curve EstimatorVERIFIED CLEANHourly Rate / Freelance Pricing CalculatorVERIFIED CLEANHSA Triple-Tax-Advantage CalculatorVERIFIED WITH ERRATAInflation Adjuster (CPI)VERIFIED CLEANInvoice Late Fee / Payment Terms CalculatorVERIFIED CLEANIRR SolverVERIFIED CLEANIRS Contribution Limit Lookup (401k/IRA/HSA)VERIFIED CLEANKelly Criterion CalculatorVERIFIED CLEANLease vs Buy ComparatorVERIFIED CLEANLTV / CAC / Payback Unit EconomicsVERIFIED WITH ERRATAMACRS Depreciation CalculatorVERIFIED CLEANMargin vs Markup ConverterVERIFIED CLEANMonte Carlo Retirement SimulatorVERIFIED CLEANMRR/ARR & Churn TrackerVERIFIED WITH ERRATANet Worth Tracker/CalculatorVERIFIED CLEANNPV CalculatorVERIFIED CLEANOptions Payoff DiagramVERIFIED CLEANPayback Period CalculatorVERIFIED CLEANPaycheck / Take-Home Pay EstimatorVERIFIED CLEANPayroll / Employee Cost Calculator (Employer Side)VERIFIED CLEANPayroll Deduction / Paystub Breakdown SimulatorVERIFIED CLEANPMI / LTV EstimatorVERIFIED CLEANPortfolio Diversification / CorrelationVERIFIED CLEANPrice Elasticity of Demand CalculatorVERIFIED CLEANPricing/Discount & Markdown CalculatorVERIFIED CLEANPurchasing Power Parity (PPP) ComparatorVERIFIED CLEANQuarterly Estimated Tax PlannerVERIFIED CLEANReal Estate Cap Rate & Cash-on-Cash ReturnVERIFIED CLEANReal GDP / GDP Deflator ConverterVERIFIED CLEANReal vs Nominal ReturnVERIFIED CLEANRefinance Break-EvenVERIFIED CLEANRent vs Buy (Home) ComparatorVERIFIED CLEANRental Property Cash Flow AnalyzerVERIFIED WITH ERRATARetirement Nest Egg (4% Rule) EstimatorVERIFIED CLEANROI CalculatorVERIFIED CLEANRule of 70 GDP Doubling TimeVERIFIED CLEANRule of 72 / 70 / 114 EstimatorVERIFIED CLEANSAFE/Convertible Note Conversion (Simple)VERIFIED CLEANSalary/Raise Purchasing-Power CheckVERIFIED CLEANSales Commission CalculatorVERIFIED CLEANSales Tax CalculatorVERIFIED CLEANSavings Goal PlannerVERIFIED WITH ERRATASelf-Employment Tax EstimatorVERIFIED CLEANSocial Security Benefit Estimator (Simplified)VERIFIED CLEANStudent Loan Payoff & IDR EstimateVERIFIED CLEANTax Bracket / Marginal Rate EstimatorVERIFIED CLEANTip CalculatorVERIFIED CLEANUnemployment & Labor Force Rate CalculatorVERIFIED CLEANUnit Conversion Cost ComparatorVERIFIED CLEANValuation Multiples ComparatorVERIFIED CLEANWACC CalculatorVERIFIED CLEANWorking Capital & Liquidity RatiosVERIFIED CLEAN
Finance/Economics 1
Mathematics 5
Mathematics — arithmetic through advanced (algebra, matrices, calculus, sequences/series, number theory, combinatorics, graphing, complex numbers, geometry, logic, sets) 71
2D Shape Area/Perimeter CalculatorVERIFIED CLEAN3D Solid Volume/Surface Area CalculatorVERIFIED CLEAN3D Surface PlotterVERIFIED CLEANBase-N & Number System ConverterVERIFIED CLEANBig Number / Arbitrary Precision CalculatorVERIFIED CLEANBinomial Theorem ExpanderVERIFIED CLEANBoolean Expression Simplifier (Karnaugh Map)VERIFIED CLEANCAS Simplifier / SolverVERIFIED CLEANCombinatorics Calculator (nCr/nPr/multinomial)VERIFIED CLEANComplex Number CalculatorVERIFIED CLEANComplex Roots & De Moivre VisualizerVERIFIED CLEANConic Section Identifier & PlotterVERIFIED CLEANContinued Fraction ConverterVERIFIED WITH ERRATACoordinate Geometry ToolkitVERIFIED CLEANCorrelation & Covariance CalculatorVERIFIED CLEANDerivative Calculator (symbolic + numeric)VERIFIED WITH ERRATADiophantine Equation Solver (linear)VERIFIED WITH ERRATAEigenvalue/Eigenvector Visualizer (2D)VERIFIED CLEANFunction Composition & Inverse FinderVERIFIED CLEANFunction Domain/Range AnalyzerVERIFIED CLEANFunction Transformation VisualizerVERIFIED CLEANGCD/LCM CalculatorVERIFIED CLEANGeometry Solver — TriangleVERIFIED WITH ERRATAGolden Ratio & Fibonacci ExplorerVERIFIED CLEANGraph Plotter — 2D FunctionVERIFIED WITH ERRATAHypothesis Test Calculator (t-test/z-test/chi²)VERIFIED WITH ERRATAImplicit Function PlotterVERIFIED CLEANInequality Solver & Number-Line GrapherVERIFIED CLEANIntegral Calculator (symbolic + numeric)VERIFIED CLEANLimit CalculatorVERIFIED CLEANLinear Equation SolverVERIFIED CLEANLogic Gate Circuit SimulatorVERIFIED CLEANLogic Truth Table GeneratorVERIFIED CLEANMagic Square / Latin Square GeneratorVERIFIED CLEANMandelbrot / Julia Set ExplorerVERIFIED CLEANMarkov Chain SimulatorVERIFIED WITH ERRATAMatrix Calculator (det/inverse/rref/eigen/least-squares)VERIFIED CLEANMatrix Transformation Visualizer (2D)VERIFIED CLEANModular Arithmetic ToolkitVERIFIED CLEANNormal Distribution CalculatorVERIFIED WITH ERRATANumeric Root Finder (Newton/Bisection/Secant)VERIFIED CLEANODE Solver (Euler / RK4 / RK45)VERIFIED CLEANOptimization (1D min/max finder)VERIFIED CLEANOther Distributions Calculator (binomial/Poisson/t/chi²)VERIFIED CLEANParametric Curve PlotterVERIFIED CLEANPartial Fraction DecompositionVERIFIED CLEANPascal's Triangle ExplorerVERIFIED CLEANPigeonhole & Counting Principle DemonstratorVERIFIED CLEANPolar Curve PlotterVERIFIED WITH ERRATAPolynomial GCD / FactoringVERIFIED CLEANPolynomial Root FinderVERIFIED CLEANPower Series Radius of ConvergenceVERIFIED CLEANPrime Checker & Generator (Sieve)VERIFIED WITH ERRATAPrime Factorization & Divisor ExplorerVERIFIED CLEANProbability Basics CalculatorVERIFIED CLEANQuadratic Equation SolverVERIFIED CLEANRandom Number & Distribution SamplerVERIFIED CLEANRegression Toolkit (linear/poly/exp/log)VERIFIED WITH ERRATAScientific CalculatorVERIFIED CLEANSequence & Series ExplorerVERIFIED CLEANSeries Convergence TesterVERIFIED CLEANSet Cardinality & Power Set GeneratorVERIFIED CLEANSet Operations Visualizer (Venn)VERIFIED CLEANSlope Field / Direction Field PlotterVERIFIED CLEANStatistics Suite (descriptive stats)VERIFIED CLEANSummation & Product Notation EvaluatorVERIFIED CLEANSystem of Equations Solver (n×n linear)VERIFIED CLEANTaylor / Maclaurin Series GeneratorVERIFIED CLEANTrigonometric Identity Verifier & SimplifierVERIFIED CLEANUnit & Dimensional Analysis ConverterVERIFIED CLEANUnit Circle ExplorerVERIFIED CLEAN
Mechanical, Civil & Structural Engineering 4
Mechanical, Civil & Structural Engineering — Statics/Dynamics, Strength of Materials, Machine Design, Civil, HVAC, Vibration 89
Axial Stress & Strain CalculatorVERIFIED CLEANBanked Curve / Centripetal Force CalculatorVERIFIED CLEANBeam Deflection — Overhanging BeamVERIFIED WITH ERRATABeam Deflection & Reactions — Simply Supported, Point LoadVERIFIED CLEANBeam Deflection & Reactions — Simply Supported, UDLVERIFIED CLEANBearing Equivalent Dynamic Load CalculatorVERIFIED CLEANBearing L10 Life CalculatorVERIFIED CLEANBelt & Pulley Speed/Length CalculatorVERIFIED CLEANBelt Friction (Capstan Equation)VERIFIED CLEANBolt Group / Eccentric Fastener Pattern SolverVERIFIED WITH ERRATABolt Torque-to-Preload CalculatorVERIFIED WITH ERRATABolted Joint Strength CalculatorVERIFIED CLEANCable/Catenary Sag-Tension CalculatorVERIFIED WITH ERRATACentroid & Center of Mass Calculator (Composite Areas/Bodies)VERIFIED CLEANCFM ↔ Air Changes per Hour ConverterVERIFIED CLEANClutch/Brake Torque Capacity CalculatorVERIFIED WITH ERRATACollision Solver (1D Elastic/Inelastic)VERIFIED CLEANColumn Buckling — Euler Critical LoadVERIFIED CLEANComposite Section BuilderVERIFIED WITH ERRATAConcrete Mix Design Calculator (ACI Method, Simplified)VERIFIED CLEANCrane Hook / Lifting Sling Angle Load CalculatorVERIFIED CLEANCulvert/Pipe Sizing CalculatorVERIFIED CLEANDamped Vibration Response CalculatorVERIFIED WITH ERRATADarcy-Weisbach Pressure DropVERIFIED CLEANDegree-Day Energy EstimatorVERIFIED CLEANDuct Sizing Calculator (Equal Friction Method)VERIFIED CLEANFactor of Safety / Allowable Stress CalculatorVERIFIED CLEANFan/Pump Affinity Laws CalculatorVERIFIED CLEANFatigue S-N Curve / Life EstimatorVERIFIED CLEANFlywheel Energy Storage CalculatorVERIFIED WITH ERRATAFooting Size Calculator (Preliminary)VERIFIED CLEANForced Vibration / Resonance Response CalculatorVERIFIED CLEANFree Body Diagram / Reaction Solver (2D Rigid Body)VERIFIED CLEANFriction Wedge / Inclined Plane SolverVERIFIED CLEANGear Ratio & Train CalculatorVERIFIED WITH ERRATAGear Tooth Bending Stress (Lewis Equation)VERIFIED CLEANGoodman / Soderberg Fatigue DiagramVERIFIED CLEANHelical Compression/Extension Spring DesignerVERIFIED CLEANHVAC Heating/Cooling Load Estimator (Envelope Method)VERIFIED CLEANImpact Load Factor CalculatorVERIFIED CLEANJohnson Parabolic Formula (Intermediate Columns)VERIFIED CLEANKey & Keyway Shear/Bearing Stress CalculatorVERIFIED CLEANKinematics — Uniformly Accelerated Motion SolverVERIFIED CLEANMarin Endurance Limit ModifiersVERIFIED CLEANMohr's Circle for 3D Stress (Principal Stresses)VERIFIED CLEANMohr's Circle for Plane StressVERIFIED CLEANMoment of Inertia / Section Properties CalculatorVERIFIED CLEANMulti-Span Continuous Beam SolverVERIFIED WITH ERRATANatural Frequency of Spring-Mass SystemVERIFIED CLEANOpen-Channel Flow — Manning's EquationVERIFIED CLEANParallel Axis Theorem CalculatorVERIFIED CLEANPavement Thickness — Simplified (AASHTO/CBR Method)VERIFIED CLEANPipe/Duct Reynolds Number & Flow RegimeVERIFIED CLEANPress/Shrink Fit Interference CalculatorVERIFIED CLEANProjectile Motion SolverVERIFIED CLEANR-Value / U-Value Wall Assembly CalculatorVERIFIED CLEANRational Method Peak Runoff CalculatorVERIFIED CLEANRebar Area / Spacing CalculatorVERIFIED CLEANRebar Development Length CalculatorVERIFIED CLEANReinforced Concrete Beam — Singly Reinforced Flexural CapacityVERIFIED WITH ERRATARetaining Wall — Rankine Active/Passive Earth PressureVERIFIED CLEANRotating Unbalance Force CalculatorVERIFIED CLEANRotational Kinematics & Moment of Inertia (Rigid Bodies)VERIFIED CLEANScrew Jack / Power Screw Torque CalculatorVERIFIED CLEANSensible & Latent Heat / Psychrometric CalculatorVERIFIED CLEANShaft Diameter Sizing (Torsion + Bending)VERIFIED WITH ERRATAShaft Power-Torque-Speed CalculatorVERIFIED CLEANShear & Moment Diagram PlotterVERIFIED WITH ERRATASlope Stability — Infinite Slope MethodVERIFIED CLEANSoil Bearing Capacity — Terzaghi SimplifiedVERIFIED CLEANSpring Fatigue Life Estimator (Wahl + Goodman)VERIFIED CLEANSpur Gear Geometry CalculatorVERIFIED CLEANStress Concentration Factor LookupVERIFIED CLEANThermal Stress CalculatorVERIFIED CLEANThick-Wall Cylinder Stress (Lamé)VERIFIED CLEANThin-Wall Pressure Vessel StressVERIFIED CLEANTorsion (Helical) Spring CalculatorVERIFIED CLEANTorsion of Circular ShaftsVERIFIED CLEANTorsional Vibration Natural FrequencyVERIFIED CLEANTruss Determinacy CheckerVERIFIED CLEANTruss Solver (Method of Joints)VERIFIED CLEANUnit Weight / Self-Weight Load Calculator (Structural Members)VERIFIED CLEANV-Belt Power Rating CalculatorVERIFIED CLEANVibration Isolation Transmissibility CalculatorVERIFIED WITH ERRATAVon Mises / Tresca Failure Criteria CheckerVERIFIED CLEANWater-Cement Ratio ↔ Strength EstimatorVERIFIED CLEANWeld Group (Line) Property CalculatorVERIFIED CLEANWelded Joint Strength CalculatorVERIFIED CLEANWork-Energy & Impulse-Momentum CalculatorVERIFIED CLEAN
Physics 5
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 CLEAN1D/2D Inelastic Collision Solver (coefficient of restitution)VERIFIED CLEAN2D Collision Solver (oblique)VERIFIED CLEANAngular Momentum CalculatorVERIFIED CLEANAtwood Machine SolverVERIFIED CLEANBeat Frequency CalculatorVERIFIED CLEANBiot-Savart Field of a Straight Wire CalculatorVERIFIED CLEANBlackbody Spectral Radiance Plotter (Planck's Law)VERIFIED WITH ERRATABohr Model Hydrogen Energy Levels CalculatorVERIFIED CLEANBrewster's Angle CalculatorVERIFIED CLEANCenter of Mass CalculatorVERIFIED CLEANCircular Orbital Velocity & Period CalculatorVERIFIED WITH ERRATACODATA Physical Constants ReferenceVERIFIED CLEANCoulomb's Law CalculatorVERIFIED CLEANCritical Angle / Total Internal Reflection CalculatorVERIFIED CLEANCyclotron Motion CalculatorVERIFIED CLEANDamped Harmonic Oscillator CalculatorVERIFIED WITH ERRATAde Broglie Wavelength CalculatorVERIFIED CLEANDiffraction Grating CalculatorVERIFIED CLEANDoppler Effect Calculator (sound)VERIFIED WITH ERRATADouble-Slit / Single-Slit Diffraction CalculatorVERIFIED CLEANDriven Oscillator / Resonance Curve CalculatorVERIFIED WITH ERRATAElastic/Spring Potential Energy CalculatorVERIFIED CLEANElectric Field from Point Charge(s) CalculatorVERIFIED CLEANElectric Potential (Point Charges) CalculatorVERIFIED CLEANEscape Velocity CalculatorVERIFIED CLEANForce on a Current-Carrying Wire in a FieldVERIFIED CLEANFriction Force CalculatorVERIFIED CLEANGravitational Potential Energy CalculatorVERIFIED CLEANGyroscopic Precession CalculatorVERIFIED CLEANHohmann Transfer Orbit CalculatorVERIFIED WITH ERRATAHooke's Law Spring Force CalculatorVERIFIED CLEANImpulse-Momentum CalculatorVERIFIED CLEANInclined Plane SolverVERIFIED CLEANKepler's Third Law CalculatorVERIFIED WITH ERRATAKinetic Energy CalculatorVERIFIED CLEANLength Contraction CalculatorVERIFIED CLEANLocal Gravitational Acceleration at AltitudeVERIFIED CLEANLorentz Force CalculatorVERIFIED CLEANMagnetic Field of a Current Loop / Solenoid CalculatorVERIFIED CLEANMalus's Law Polarization CalculatorVERIFIED CLEANMass-Energy Equivalence Calculator (E=mc²)VERIFIED CLEANMaxwell-Boltzmann Speed Distribution CalculatorVERIFIED CLEANMoment of Inertia Lookup & CalculatorVERIFIED CLEANMomentum CalculatorVERIFIED CLEANNewton's Law of Gravitation CalculatorVERIFIED CLEANNewton's Second Law / Free-Body Force SolverVERIFIED CLEANNuclear Binding Energy CalculatorVERIFIED CLEANParallel Plate Capacitor Field/Energy CalculatorVERIFIED CLEANPhotoelectric Effect CalculatorVERIFIED CLEANPhoton Energy & Momentum CalculatorVERIFIED CLEANPhysical (Compound) Pendulum Period CalculatorVERIFIED CLEANPower CalculatorVERIFIED CLEANProjectile Range & Trajectory PlotterVERIFIED CLEANProjectile with Air Drag (numeric)VERIFIED CLEANRadioactive Decay Chain SimulatorVERIFIED WITH ERRATARay Diagram Plotter (lens/mirror)VERIFIED WITH ERRATARelativistic Doppler Effect CalculatorVERIFIED CLEANRelativistic Momentum & Kinetic Energy CalculatorVERIFIED CLEANRelativistic Velocity Addition CalculatorVERIFIED CLEANRolling Without Slipping SolverVERIFIED CLEANRotational Kinematics SolverVERIFIED CLEANRotational Kinetic Energy CalculatorVERIFIED CLEANSimple Pendulum Period CalculatorVERIFIED CLEANSnell's Law Refraction CalculatorVERIFIED CLEANSound Intensity & Decibel Level CalculatorVERIFIED CLEANSpherical Mirror Equation CalculatorVERIFIED CLEANSpring-Mass SHM CalculatorVERIFIED CLEANStanding Wave Harmonics Calculator (strings & pipes)VERIFIED CLEANStefan-Boltzmann Radiated Power CalculatorVERIFIED CLEANThin Lens Equation CalculatorVERIFIED CLEANTime Dilation CalculatorVERIFIED CLEANTorque CalculatorVERIFIED CLEANTwo-Body Barycenter / Reduced Mass CalculatorVERIFIED CLEANUniform Circular Motion CalculatorVERIFIED CLEANUnit Converter — Physics QuantitiesVERIFIED CLEANVis-Viva / Elliptical Orbit Energy CalculatorVERIFIED CLEANWave Speed / Wavelength / Frequency CalculatorVERIFIED CLEANWien's Displacement Law CalculatorVERIFIED CLEANWork-Energy Theorem CalculatorVERIFIED CLEAN
Thermodynamics & Energy 1
Thermodynamics, Fluids & Aero 63
Airfoil Lift-to-Drag Polar PlotterVERIFIED CLEANAirspeed Converter (IAS/CAS/TAS/EAS)VERIFIED CLEANBernoulli Equation SolverVERIFIED CLEANBiot Number / Lumped Capacitance Validity CheckVERIFIED CLEANBoundary Layer Thickness Estimator (Flat Plate)VERIFIED CLEANBrayton Cycle Efficiency CalculatorVERIFIED CLEANBreguet Range Equation CalculatorVERIFIED CLEANCarnot Efficiency CalculatorVERIFIED CLEANChoked Flow / Nozzle Mass Flow CalculatorVERIFIED WITH ERRATAColebrook-White / Moody Friction Factor SolverVERIFIED CLEANCombined/Boyle's/Charles's/Gay-Lussac's Law CalculatorVERIFIED CLEANComposite Wall R-value / U-value CalculatorVERIFIED CLEANCompressibility Factor (Z) EstimatorVERIFIED CLEANConvection Coefficient (Nu Correlation) EstimatorVERIFIED CLEANConverging-Diverging Nozzle Area-Ratio CalculatorVERIFIED WITH ERRATACooling Tower Approach/Range CalculatorVERIFIED CLEANCylindrical/Spherical Conduction Resistance CalculatorVERIFIED CLEANDarcy-Weisbach Pressure Drop CalculatorVERIFIED WITH ERRATADiesel Cycle Efficiency CalculatorVERIFIED CLEANDimensionless Numbers PanelVERIFIED CLEANDrag Force / Drag Coefficient CalculatorVERIFIED CLEANDual (Sabathé) Cycle Efficiency CalculatorVERIFIED CLEANFin Effectiveness/Efficiency CalculatorVERIFIED CLEANFluid Property Lookup (Water/Air/Common Fluids)VERIFIED CLEANFourier Conduction (Plane Wall) CalculatorVERIFIED CLEANHumidity Ratio CalculatorVERIFIED CLEANHVAC Sensible/Latent Load CalculatorVERIFIED CLEANIsentropic Flow Relations CalculatorVERIFIED CLEANIsothermal / Adiabatic / Polytropic Process CalculatorVERIFIED CLEANLift Coefficient / Lift Force CalculatorVERIFIED CLEANLMTD Heat Exchanger CalculatorVERIFIED CLEANMach Number CalculatorVERIFIED CLEANMinor Losses (K-factor) CalculatorVERIFIED CLEANMoist Air Enthalpy CalculatorVERIFIED CLEANMollier (h-s) Diagram PlotterVERIFIED CLEANNatural Convection (Rayleigh/Grashof) CalculatorVERIFIED CLEANNormal Shock Relations CalculatorVERIFIED WITH ERRATANPSH Available CalculatorVERIFIED CLEANNTU-Effectiveness Heat Exchanger CalculatorVERIFIED WITH ERRATAOblique Shock CalculatorVERIFIED WITH ERRATAOrifice Flow Meter CalculatorVERIFIED WITH ERRATAOtto Cycle Efficiency CalculatorVERIFIED CLEANOverall Heat Transfer Coefficient (U) CalculatorVERIFIED WITH ERRATAPipe System Pressure Drop (Series Network) CalculatorVERIFIED CLEANPsychrometric Chart ToolVERIFIED WITH ERRATAPump Affinity Laws CalculatorVERIFIED CLEANPump Hydraulic Power CalculatorVERIFIED CLEANRadiation Heat Transfer CalculatorVERIFIED WITH ERRATARankine Cycle Efficiency CalculatorVERIFIED CLEANRelative Humidity ↔ Dew Point ConverterVERIFIED CLEANReynolds Number CalculatorVERIFIED CLEANSpecific Heat Ratio (γ) / Cp,Cv LookupVERIFIED CLEANSphere/Cylinder Drag Coefficient vs Reynolds CorrelationVERIFIED CLEANStagnation Properties Calculator (Compressible Flow)VERIFIED CLEANStandard Atmosphere (ISA) CalculatorVERIFIED CLEANSteam Quality (Dryness Fraction) CalculatorVERIFIED CLEANSteam Table Property LookupVERIFIED CLEANStirling Cycle Efficiency CalculatorVERIFIED CLEANStokes' Law Settling Velocity CalculatorVERIFIED CLEANTransient Conduction (Lumped Capacitance) CalculatorVERIFIED CLEANVan der Waals Real-Gas EOS SolverVERIFIED CLEANVenturi Flow Meter CalculatorVERIFIED CLEANWet-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 instrumentsTelescope Night Kit8 instrumentsMetabolic Health Suite10 instrumentsRenal Dosing Chain (education)8 instrumentsBuffer Bench8 instrumentsReaction Energetics Bench8 instrumentsHome Renovation Estimator11 instrumentsMortgage Suite9 instrumentsInvestor's Valuation Bench8 instrumentsStartup Unit Economics7 instrumentsAudio Engineer's Rack11 instrumentsMusic Timing & Pitch Kit8 instrumentsPhotographer's Exposure Bench9 instrumentsVideo Pipeline Kit6 instrumentsElectronics Power-Rail Designer9 instrumentsOff-Grid Solar Designer7 instrumentsMotor & Drivetrain Bench10 instrumentsBeam & Column Structural Bench12 instrumentsHeat-Transfer Path10 instrumentsPipe & Pump Bench8 instrumentsEngine Cycle Comparator7 instrumentsCrypto & Number Theory Classroom11 instrumentsNetwork Planner6 instrumentsRunning Coach Kit6 instrumentsPregnancy & Cycle Suite4 instrumentsWeather Station9 instrumentsKinematics & Collisions Tutor14 instruments
Sources and evidence
These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.
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