Source: https://guthlabs.ai/docs/instruments/calories-burned-estimator-met-tables/implementation/

instrument implementation / implementation-contract

# Calories Burned Estimator (MET Tables) implementation

A source-bound implementation contract for Calories Burned Estimator (MET Tables); 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**: t7-049

**Effect**: Computation or source lookup only

## Input and validation requirements

The estimator has no division-by-zero formula trap, but an extreme valid-number input can overflow ordinary floating-point arithmetic to Infinity, and an unlabeled body-weight unit can change the estimate from 662.2 kcal to 300.3686224 kcal.

## 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": {
    "activity": "Walking at 3.0 mph (4.8 km/h), level",
    "duration": 1.5,
    "duration_unit": "hours",
    "weight_kg": 80
  },
  "expected_outputs": {
    "estimated_energy_kcal_gross": 396
  },
  "reference_data": {
    "activity": "Walking at 3.0 mph, level",
    "MET": 3.3,
    "source_convention": "Ainsworth et al., Compendium of Physical Activities, 2011 update; widely tabulated standard value"
  },
  "working": "MET × weight × duration = 3.3 × 80 kg × 1.5 h = 264 × 1.5 = 396.0 kcal gross."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/calories-burned-estimator-met-tables/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/calories-burned-estimator-met-tables/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/calories-burned-estimator-met-tables/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-tranche7/tranche7-results.json`