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Health & Fitness

BMR Calculator

Estimate basal metabolic rate (BMR) with the Mifflin–St Jeor, revised Harris–Benedict or Katch–McArdle equation.

Your inputs

These formulas were developed for adults.

Results

BMR

1,649 kcal/day

Mifflin–St Jeor
1,649 kcal/day
Harris–Benedict (revised)
1,696 kcal/day

≈Estimate based on the stated model and assumptions

Notes for this result

  • This is a population-level estimate for adults, not a diagnosis. Discuss health decisions with a qualified professional.
  • Individual metabolic rates commonly differ from predictive equations by 10 % or more.

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

BMR is the energy your body uses at complete rest. Predictive equations estimate it from weight, height, age and sex (or lean mass).

Formula and method

Mifflin–St Jeor: 10W + 6.25H − 5A + 5 (men) or − 161 (women) Harris–Benedict (revised 1984): men 88.362 + 13.397W + 4.799H − 5.677A; women 447.593 + 9.247W + 3.098H − 4.330A Katch–McArdle: 370 + 21.6 × lean body mass (kg)
W
weight in kg
H
height in cm
A
age in years

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Units: Metric (kg, cm)
  • Sex (used by the formula): Male
  • Age: 30 years
  • Weight: 70 kg
  • Height: 175 cm
  • Formula: Mifflin–St Jeor (1990)

Results

  • BMR: 1,649 kcal/day
  • Mifflin–St Jeor: 1,649 kcal/day
  • Harris–Benedict (revised): 1,696 kcal/day

How to read the results

BMR is typically 60–70 % of total daily energy use; multiply by an activity factor for TDEE.

Assumptions and limitations

  • Mifflin–St Jeor is generally considered the more accurate of the first two for modern populations.
  • An estimate for healthy adults, not a diagnosis or medical advice. Consult a qualified health professional about your personal situation.

Health results are general estimates for adults and do not replace medical advice, diagnosis or treatment. Speak to a qualified health professional about your personal situation, especially during pregnancy or if you have a medical condition.

Questions

Which equation should I use?

Mifflin–St Jeor by default; Katch–McArdle if you know your body fat percentage reliably.

Sources

  • Mifflin MD, St Jeor ST, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241–247.
  • Roza AM, Shizgal HM. The Harris Benedict equation reevaluated. Am J Clin Nutr. 1984;40(1):168–182.

Methodology and verification

Result type
Estimate based on the stated model and assumptions
Formula version
1.0
Automated verification
4 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy