How it works
Compare your basal metabolic rate from the Mifflin–St Jeor and Harris–Benedict equations.
Enter your sex, age, height, and weight. The calculator estimates BMR with two widely used equations and reports both plus their average.
Formula
Mifflin–St Jeor: men 10W + 6.25H − 5A + 5, women 10W + 6.25H − 5A − 161. Harris–Benedict: men 88.362 + 13.397W + 4.799H − 5.677A, women 447.593 + 9.247W + 3.098H − 4.330A.
W- Weight (kg)
H- Height (cm)
A- Age (years)
Examples
- Male, 30, 180 cm, 75 kgMale · age 30 · height 180 · weight 75Mifflin ≈ 1,730 kcal/day · Harris–Benedict ≈ 1,787 kcal/day · average ≈ 1,758
Frequently asked questions
Why two equations?
Different equations were derived from different populations. Comparing them gives a sense of the reasonable range rather than trusting a single figure.
How is this different from the calorie calculator?
This page compares BMR formulas (Mifflin–St Jeor, Harris–Benedict and their average). The calorie calculator starts from a single BMR estimate and scales it to daily maintenance calories.
How to read the result
BMR is the energy your body uses at complete rest for basic functions. The average is a sensible midpoint estimate.
Limitations
Population-average estimates; individual metabolism varies. Not a substitute for clinical metabolic testing or medical advice.
Source: Mifflin–St Jeor (1990) and Harris–Benedict revised (Roza & Shizgal, 1984) BMR equations.