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Energy expenditure (Mifflin–St Jeor and Harris–Benedict)

Estimates resting energy expenditure in healthy adults and total daily expenditure from activity level to plan dietary prescriptions.

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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

Mifflin–St Jeor 1990 and revised Harris–Benedict Roza–Shizgal 1984; PAL FAO/WHO/UNU 2004

The Mifflin equation was derived in healthy adults aged 19–78 years, with normal weight and obesity, using weight in kg, height in cm and age in years. It is not equivalent to individual calorimetry and does not establish suitability in children, pregnancy or critical illness. Other equations and activity factors must follow their own sources and 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

Sex
Age · years
Weight · kg
Height · cm
Physical activity level (PAL)

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.

Mifflin–St Jeor: 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5 (men) or − 161 (women).

Revised Harris–Benedict (Roza and Shizgal, 1984): men 88.362 + 13.397 × weight + 4.799 × height − 5.677 × age; women 447.593 + 9.247 × weight + 3.098 × height − 4.330 × age.

Total expenditure = resting expenditure × PAL (FAO/WHO/UNU 2004: sedentary 1.40 to 1.69; active 1.70 to 1.99; vigorous 2.00 to 2.40).

References

Identifier: gasto-energetico

Original clinical content: Brazilian Portuguese.

Method version

Mifflin–St Jeor 1990 and revised Harris–Benedict Roza–Shizgal 1984; PAL FAO/WHO/UNU 2004

gasto-energetico@native-2026-10-03+c09eea23801c

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

Sex: Male
Age: 40 years
Weight: 80 kg
Height: 180 cm
Physical activity level (PAL): Active or moderately active (PAL 1.76)

{
  "sexo": "M",
  "idade": 40,
  "peso": 80,
  "altura": 180,
  "pal": "1.76"
}

Expected result

{
  "mifflin": 1730,
  "hb": 1796.86,
  "tee": 3044.8
}

Actual result

{
  "mifflin": 1730,
  "hb": 1796.862,
  "tee": 3044.8
}

Case 2

reference-002

Inputs

Sex: Female
Age: 30 years
Weight: 60 kg
Height: 165 cm
Physical activity level (PAL): Sedentary or light (PAL 1.53)

{
  "sexo": "F",
  "idade": 30,
  "peso": 60,
  "altura": 165,
  "pal": "1.53"
}

Expected result

{
  "mifflin": 1320.25,
  "hb": 1383.68,
  "tee": 2019.98
}

Actual result

{
  "mifflin": 1320.25,
  "hb": 1383.683,
  "tee": 2019.9825
}

Case 3

reference-003

Inputs

Sex: Male
Age: 70 years
Weight: 100 kg
Height: 170 cm
Physical activity level (PAL): Vigorous (PAL 2.25)

{
  "sexo": "M",
  "idade": 70,
  "peso": 100,
  "altura": 170,
  "pal": "2.25"
}

Expected result

{
  "mifflin": 1717.5,
  "tee": 3864.375
}

Actual result

{
  "mifflin": 1717.5,
  "hb": 1846.5020000000004,
  "tee": 3864.375
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

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.