BMR Calculator: Estimate Resting Energy

Estimate resting metabolic energy with the Mifflin–St Jeor formula, clear steps and exact unit conversion.

Example values are shown. Replace them with your own.

Age

Sex coefficient in the equation

The published formula uses female and male coefficients, not gender identity. Hormone treatment and individual physiology may affect suitability.

Height

Weight

Energy units

Measurements stay on this page. They are not saved, added to URLs or sent to our server. Input ranges are software limits, not recommended body measurements.

Resting energy estimate (BMR / RMR)

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kcal/day

Resting energy excludes the full cost of everyday life and is not a calorie-intake recommendation.

Who this tool is for

For adults aged 18 and older. This tool does not estimate children’s or teens’ calorie needs. Not for pregnancy, breastfeeding, eating-disorder care or medical nutrition treatment. Ask a qualified professional about individual needs.

Show the math

Step	Value

BMR and RMR are not identical

Basal metabolic rate is measured under stricter conditions than resting metabolic rate. Mifflin predicts resting energy expenditure; this page uses the familiar BMR label while explaining the distinction.

What the resting number excludes

The result is not a complete day of food needs. Movement, digestion and activity increase expenditure beyond rest. Use the calorie calculator to compare daily scenarios.

Sources

Sources checked: 2026-10-26

BMR calculator

BMR and RMR are not identical

What the resting number excludes

Sources