BMR Calculator
Resting energy using Mifflin St Jeor with unit toggles and a shareable screenshot.
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GuideUnderstanding BMI, BMR and TDEE Estimates
Read guide →
Read body-mass and energy estimates as general screening and planning values rather than diagnoses.
Frequently asked questions
What does BMR measure?
Basal metabolic rate estimates the energy your body uses at rest for essential functions such as breathing and circulation.
Which BMR formula does this calculator use?
The calculator uses the Mifflin–St Jeor equation, which estimates resting energy from age, sex, weight, and height.
Is BMR the same as daily calorie needs?
No. Daily needs also include movement, exercise, and digestion. Use the TDEE calculator to add an activity estimate.
Why is my BMR only an estimate?
Body composition, health, medication, and individual metabolism can change actual resting energy use.