Health
Resting energy expenditure estimated with the Mifflin–St Jeor equation, from weight, height, age, and sex.
Results update as you type. No calculate button. All calculations run locally in your browser.
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| Period | Energy |
|---|---|
| Per day (BMR) | — |
| Per week | — |
| Per 30 days | — |
| Other sex, same weight / height / age | — |
Bars are scaled to the larger of the two values. The only difference between the two bars is the sex constant (+5 for male, −161 for female) in the Mifflin–St Jeor equation.
BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + 5 for men or − 161 for women. This is the Mifflin–St Jeor equation.
Weight 65 kg, height 170 cm, age 30, female: BMR = 10 × 65 + 6.25 × 170 − 5 × 30 − 161 = 650 + 1,062.5 − 150 − 161 = 1,401.5 kcal/day. That is 9,811 kcal per week and 42,045 kcal per 30 days. With the male constant (+5 instead of −161) the same inputs give 1,567.5 kcal/day. Use Reset example above to reproduce this result.
BMR is resting expenditure only — it excludes activity, digestion, and exercise, so it is lower than total daily expenditure. The Mifflin–St Jeor equation is a population estimate: it was fitted to group averages, so individual results vary with body composition, illness, medications, and other factors the inputs do not capture. It is not a metabolic test and not a personal energy prescription.
The energy the body uses at complete rest to maintain basic functions. Any activity on top of rest adds to it, which is why total daily expenditure is higher.
The Mifflin–St Jeor equation adds +5 for men and subtracts 161 for women, reflecting average differences in the populations the equation was fitted to. It is a group adjustment, not a measurement of any individual.
No. Daily need also includes activity. Multiply BMR by an activity factor — or use the TDEE Calculator — for a total daily estimate.
It is an estimate from a population equation. Individual values can differ materially; only a metabolic test measures resting expenditure directly.
No. This calculation runs locally in your browser and the values you enter are not sent to a CalcMintly database.
Yes, through the −5 × age term: each additional year lowers the estimate by 5 kcal/day at fixed weight and height.
Results are estimates only and do not constitute professional or medical advice.