Calories Burned Estimator (MET Tables)

Inspectable records

Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Area

Everyday & Life

Tranche

tranche-7

Evidence ID

t7-049

Ledger rows

1

No ledger note is attached.

Review findings

The algorithm is standard for gross estimated energy expenditure, but the specification needs an explicit choice between gross kcal and active kcal, explicit kg/hour input units, and a defined Compendium table edition and activity-row matching policy. The existing population-average and not-medical-advice label is appropriate.

Formula and scope findings

• calories = MET × weight_kg × duration_hr is the standard gross-energy estimate when MET is expressed as kcal/kg/hour.
• The formula is ambiguous about gross calories versus active calories. Gross energy uses MET × kg × hours; active calories above resting expenditure generally use (MET - 1) × kg × hours.
• The output should be labeled kilocalories (kcal), conventionally called food Calories (Cal), rather than simply calories.

Unit assumptions

• Body weight must be supplied in kilograms.
• Duration must be converted to decimal hours before applying the formula; for example, 45 minutes = 45/60 = 0.75 hours.
• MET is dimensionless but is interpreted using the standard approximation 1 MET = 1 kcal/kg/hour.
• The reported value is a population-average estimate and does not account for individual efficiency, body composition, fitness, age, environment, or activity execution.

Boundary hardening

BREAK_CLAIMED · SELF_FLAGGED

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.

Errata and corrections

No applied erratum is attached to this unique-name record.

Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

{
  "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."
}

Related workflows

No source-defined multi-instrument workflow membership is recorded.

Sources and evidence

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

• VERIFIED_LEDGER.json · VERIFIED_CLEAN
• evidence-tranche7/tranche7-results.json
• BOUNDARY_HAZARD_CATALOG.json