Metabolism calculators
Metabolism calculators — 3 tools, each showing the formula it uses, the source that published it, and the date that source was last checked.
TDEE calculator
Your TDEE is the calories you burn in a day: a resting metabolic rate from the Mifflin-St Jeor equation, multiplied by an activity factor. This calculator shows both, brackets the answer with the 10 percent error the equations carry, and names where your chosen activity factor sits against the FAO/WHO/UNU activity bands.
PopularBMR calculator
BMR is the energy your body uses at complete rest. This calculator runs the Mifflin-St Jeor equation, the 1984 revision of Harris-Benedict, and Katch-McArdle when you have a lean-mass figure, then shows the gap between them, because that gap is bigger than most calculators admit.
PopularMaintenance calorie calculator
Maintenance calories are the same quantity as TDEE, under a different name: the energy that leaves your weight where it is. This calculator estimates it from the Mifflin-St Jeor equation and an activity factor, shows the range that estimate really covers, and explains why the scale is the only real check.
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