BMR & TDEE Calculator

BMR (Basal Metabolic Rate) is the bare minimum number of calories your body burns at complete rest just to keep your organs functioning (breathing, circulating blood, etc.). TDEE (Total Daily Energy Expenditure) takes your BMR and adds the calories you burn through daily movement, exercise, and the digestion of food. TDEE is the actual number of calories you burn in a given day.

Yes. Biological men and women generally have different body compositions, specifically regarding muscle mass percentages and hormonal profiles. The established mathematical formulas (like Mifflin-St Jeor) account for this by using different constants for males and females to ensure highly accurate metabolic estimates.

Absolutely. This tool functions seamlessly as a BMR calculator kg (metric) and lbs (imperial) system. You can easily toggle between the two systems at the top of the calculator without losing your current inputs.

A smaller body simply requires less energy to maintain itself. As you lose weight, there is less physical mass for your body to sustain, which naturally lowers your daily caloric baseline. This is why weight loss plateaus happen and why you must periodically recalculate your BMR during a fitness journey.

The Mifflin-St Jeor equation is currently recommended by the Academy of Nutrition and Dietetics as the most accurate for the general population. However, if you are very lean and know your exact body fat percentage, the Katch-McArdle formula can provide a more highly individualized estimate because it bases the math strictly on your lean muscle mass rather than total body weight.