BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest.
Updated
What Is BMR?
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. BMR accounts for 60–75% of your total daily calorie expenditure.
Mifflin-St Jeor (Female): BMR = 10W + 6.25H − 5A − 161
W = weight in kg, H = height in cm, A = age
Frequently Asked Questions
What is BMR?
Basal Metabolic Rate — the calories your body burns at complete rest just to run vital functions like breathing and circulation. It's typically 60–75% of total daily burn.
Which formula does this calculator use?
The Mifflin-St Jeor equation, widely regarded as the most accurate general-purpose BMR formula: 10 × weight(kg) + 6.25 × height(cm) − 5 × age, plus 5 for men or minus 161 for women.
What is the difference between BMR and RMR?
BMR is measured under strict lab conditions after a full rest; RMR (resting metabolic rate) is measured under looser conditions and runs slightly higher. Calculators estimate BMR, and the terms are often used interchangeably.
Can I increase my BMR?
Building muscle is the most reliable way, since muscle burns more calories at rest than fat. Crash dieting does the opposite — it can suppress your metabolic rate.