BMR Calculator
Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure to understand how many calories your body needs each day.
What is BMR?
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at complete rest. It represents the minimum energy your body requires to stay alive.
Your Total Daily Energy Expenditure (TDEE) adds the calories burned through daily activities and exercise on top of your BMR, giving you the total calories you need each day to maintain your current weight.
About the Formulas
Mifflin-St Jeor
Developed by Mifflin et al. (1990), this equation estimates resting energy expenditure from weight, height, age and sex. Individual needs can differ from the prediction.
Harris-Benedict
Originally published in 1919 by James Arthur Harris and Francis Gano Benedict, later revised by Roza and Shizgal in 1984. One of the oldest and most well-known BMR equations, though it tends to slightly overestimate calorie needs compared to more modern formulas.
Katch-McArdle
Uses estimated lean body mass rather than total weight alone. Its result depends on the body-fat estimate you enter; uncertainty in that input carries through to the calorie estimate.