CalorieLab

Calorie Calculator

A free daily calorie calculator that estimates how many calories your body uses in a day. It computes your resting metabolic rate (BMR) with the Mifflin-St Jeor equation, scales it by an activity multiplier to a Total Daily Energy Expenditure (TDEE), then adjusts that number for your goal — maintenance keeps you level, weight loss subtracts about 500 calories a day, and muscle gain adds about 300. Everything runs in your browser, no account or upload required. The result is a general screening estimate, not medical, nutritional, or dietary advice; individual needs vary with body composition, health, and medication, so consult a qualified professional before changing your diet.