Health & Fitness
BMR Calculator
Find your basal metabolic rate — the calories your body burns at rest — with the trusted Mifflin-St Jeor equation, then see your total daily calories at five activity levels.
cm
kg
Your BMR
1,649
calories per day at complete rest
Daily calories by activity level (TDEE)
How to use the BMR calculator
Enter your sex, age, height and weight in metric or imperial units. The calculator returns your BMR — the calories you burn at rest — and a table of total daily calories for five activity levels. Pick the row that matches your week to find the calories you actually use.
The Mifflin-St Jeor formula
Men: BMR = 10·kg + 6.25·cm − 5·age + 5
Women: BMR = 10·kg + 6.25·cm − 5·age − 161
Example. A 30-year-old man, 175 cm and 70 kg: 10×70 + 6.25×175 − 5×30 + 5 = 1,649 calories at rest. Multiply by an activity factor (1.2 to 1.9) to get total daily calories.
Frequently asked questions
Your basal metabolic rate (BMR) is the number of calories your body burns at complete rest just to keep you alive — breathing, circulating blood, and maintaining organs. It is the largest part of most people's daily calorie use.