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

instrument implementation / implementation-contract

# BMR/TDEE (Mifflin-St Jeor) implementation

A source-bound implementation contract for BMR/TDEE (Mifflin-St Jeor); deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t2-014

**Effect**: Computation or source lookup only

## Input and validation requirements

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.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "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."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/bmr-tdee-mifflin-st-jeor/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/bmr-tdee-mifflin-st-jeor/mechanism/>)[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`