Source: https://guthlabs.ai/docs/instruments/bmr-tdee-mifflin-st-jeor/mechanism/

instrument mechanism / verified-clean

# BMR/TDEE (Mifflin-St Jeor) mechanism

The inspectable method record for BMR/TDEE (Mifflin-St Jeor), kept separate from implementation and qualification.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Model scope

The Mifflin-St Jeor equations and multiplicative TDEE relationship are standard and correct under the stated units. Verdict is NEEDS_REVIEW because the activity multiplier table and mapping from activity level to factor are missing, and sex-category handling is ambiguous. The educational-estimate, not-medical-advice label is appropriate.

No additional formula finding is recorded.

## Units and conventions

- Weight W is in kilograms.

- Height H is in centimeters; using meters would produce an incorrect result.

- Age A is in completed years.

- The sex-specific equations are the standard Mifflin-St Jeor male and female equations.

- Activity factor is dimensionless and is applied as TDEE = BMR × activity factor.

- BMR and TDEE outputs are expressed in kcal/day.

## Inspectable vector

One of 4 source-bound review vectors:

````
{
  "inputs": {
    "weight_kg": 70,
    "height_cm": 175,
    "age_years": 30,
    "sex": "male",
    "activity_level": "moderately active",
    "activity_factor": 1.55
  },
  "expected_outputs": {
    "BMR_kcal_per_day": 1648.75,
    "TDEE_kcal_per_day": 2555.5625
  },
  "working": "BMR = (10 × 70) + (6.25 × 175) − (5 × 30) + 5 = 700 + 1093.75 − 150 + 5 = 1648.75 kcal/day. TDEE = 1648.75 × 1.55 = 1648.75 + 906.8125 = 2555.5625 kcal/day."
}
````

## Failure boundary

**BREAK_CLAIMED** · SELF_FLAGGED

An extreme but numerically representable input causes floating-point overflow to Infinity for both BMR and TDEE. The instrument should reject nonphysical or out-of-range inputs before arithmetic.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/bmr-tdee-mifflin-st-jeor/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/bmr-tdee-mifflin-st-jeor/implementation/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/bmr-tdee-mifflin-st-jeor/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche2/tranche2-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`