Source: https://guthlabs.ai/docs/instruments/harris-benedict-bmr-legacy/mechanism/

instrument mechanism / verified-clean

# Harris-Benedict BMR (legacy) mechanism

The inspectable method record for Harris-Benedict BMR (legacy), kept separate from implementation and qualification.

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

## Model scope

NEEDS_REVIEW because the exact coefficients, required input units, sex-category behavior, validation constraints, and rounding policy are not explicitly defined. The test vectors assume the standard revised Harris-Benedict equations and kg/cm/year inputs. The honest label appropriately identifies this as an educational estimate and notes that Mifflin-St Jeor is generally preferred.

- The specification names the revised Harris-Benedict equations but does not provide their coefficients, so the exact implemented formula cannot be verified. The standard assumed equations are male: BMR = 88.362 + 13.397×weight_kg + 4.799×height_cm − 5.677×age_years; female: BMR = 447.593 + 9.247×weight_kg + 3.098×height_cm − 4.330×age_years.

- The supported meaning of sex is unspecified; the standard revised equations provide only male and female branches, with no defined handling for nonbinary, intersex, or unknown inputs.

## Units and conventions

- Weight must be supplied in kilograms.

- Height must be supplied in centimetres.

- Age must be supplied in completed years.

- The expected outputs use unrounded arithmetic results in kcal/day; display rounding is unspecified.

- For the standard equations, sex is assumed to select either the male or female coefficient set.

## Inspectable vector

One of 4 source-bound review vectors:

````
{
  "inputs": {
    "weight": 70,
    "weight_unit": "kg",
    "height": 175,
    "height_unit": "cm",
    "age": 30,
    "age_unit": "years",
    "sex": "male"
  },
  "expected_outputs": {
    "bmr_kcal_per_day": 1695.667
  },
  "working": "13.397×70 = 937.790; 4.799×175 = 839.825; 5.677×30 = 170.310; 88.362 + 937.790 = 1026.152; 1026.152 + 839.825 = 1865.977; 1865.977 − 170.310 = 1695.667 kcal/day."
}
````

## Failure boundary

**BREAK_CLAIMED** · SELF_FLAGGED

An extreme but representable JavaScript input produces NaN through Infinity minus Infinity rather than a controlled rejection. The unit probe also shows that omitted units can change the estimate from 2317.120 to 1807.137855 kcal/day.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/harris-benedict-bmr-legacy/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/harris-benedict-bmr-legacy/implementation/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/harris-benedict-bmr-legacy/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`