BMR Calculator: Basal Metabolic Rate
Calculate your BMR, TDEE and daily calorie targets for weight loss, maintenance or gain with the Mifflin-St Jeor formula — right in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
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About this tool
This page opens the calorie calculator focused on one specific number: BMR, your basal metabolic rate — the calories your body would burn in 24 hours doing absolutely nothing, not walking, not digesting, just staying alive.
BMR depends only on your sex, age, height and weight via the Mifflin-St Jeor equation (10 × weight in kg + 6.25 × height in cm − 5 × age, plus 5 for men or minus 161 for women); it does not depend on how active you are, which is exactly what separates it from TDEE. The activity dropdown on this page still appears because the same tool also computes TDEE and calorie targets underneath — feel free to ignore it if BMR is all you're after.
BMR is mostly useful as a floor: a reference point for how much your metabolism needs at rest, and a baseline that the TDEE and calorie-target numbers below it are built on top of. For the full picture — maintenance calories and ready-made loss and gain targets — enter your activity level too and scroll to the targets panel.
Example. A male age 30, 180 cm and 80 kg at the 1.2 activity factor shows a BMR of 1780 kcal/day and a TDEE of 2136 kcal/day.
Limit. The equation is Mifflin-St Jeor, and the activity choices are only 1.2, 1.375, 1.55, 1.725 and 1.9.