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Energy expenditure from METs

Converts activity intensity in METs into energy expenditure (kcal) and exercise volume (MET-min) for prescribing and counselling.

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Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

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Method · Limits of application

Standard MET 3.5 mL O₂/kg/min; kcal/min=MET×3.5×kg/200; Compendium 2024 reference

METs in the 2024 Adult Compendium correspond to activities for adults aged 19–59 years; data from people aged ≥60 years were excluded from that edition. Standardized values, including estimated values, do not measure individual expenditure. Children, older adults and special clinical conditions require sources and methods suited to those populations.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

Activity intensity (Compendium value) · METs
Weight · kg
Session duration · min
Sessions per week

3/3 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

kcal/min = METs × 3.5 × weight (kg) ÷ 200 (1 MET = 3.5 mL O₂/kg/min; about 5 kcal per litre of O₂).

MET-min = METs × minutes. An equivalent approximation is kcal ≈ METs × weight (kg) × hours.

References

Identifier: gasto-energetico-por-mets

Original clinical content: Brazilian Portuguese.

Method version

Standard MET 3.5 mL O₂/kg/min; kcal/min=MET×3.5×kg/200; Compendium 2024 reference

gasto-energetico-por-mets@native-2026-10-05+7db1387ed242

Source for the active edition

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (3)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

Activity intensity (Compendium value): 8 METs
Weight: 70 kg
Session duration: 30 min

{
  "met": 8,
  "peso": 70,
  "min": 30
}

Expected result

{
  "kcal": 294,
  "kcalmin": 9.8,
  "metmin": 240
}

Actual result

{
  "kcal": 294,
  "kcalmin": 9.8,
  "metmin": 240,
  "semana": null
}

Case 2

reference-002

Inputs

Activity intensity (Compendium value): 3.5 METs
Weight: 80 kg
Session duration: 45 min
Sessions per week: 4

{
  "met": 3.5,
  "peso": 80,
  "min": 45,
  "sessoes": 4
}

Expected result

{
  "kcal": 220.5,
  "metmin": 157.5,
  "semana": 630
}

Actual result

{
  "kcal": 220.50000000000003,
  "kcalmin": 4.9,
  "metmin": 157.5,
  "semana": 630
}

Case 3

reference-003

Inputs

Activity intensity (Compendium value): 2.5 METs
Weight: 60 kg
Session duration: 60 min

{
  "met": 2.5,
  "peso": 60,
  "min": 60
}

Expected result

{
  "kcal": 157.5
}

Actual result

{
  "kcal": 157.5,
  "kcalmin": 2.625,
  "metmin": 150,
  "semana": null
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

README

Local installation

Code license: Apache-2.0

Guidelines and conditions

This repository’s license applies to the code. Third-party instruments, questionnaires, data and models remain subject to their owners’ conditions.

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.