BMR Calculator
Find your Basal Metabolic Rate: the calories your body burns at rest, using the Mifflin-St Jeor and Harris-Benedict equations.
About the BMR Calculator
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to keep you alive at complete rest: breathing, pumping blood and repairing cells. Knowing your BMR is the first step in planning a diet for weight loss, maintenance or muscle gain.
How to Use the BMR Calculator
- Select your units, then enter age and gender.
- Enter your height and weight.
- Press Calculate to see your BMR with two well-known formulas.
Formula and How It Works
Mifflin-St Jeor: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5 for men, or − 161 for women. The revised Harris-Benedict equation is shown as a second estimate. Mifflin-St Jeor is generally considered the more accurate of the two.
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR is what you burn at complete rest. TDEE (Total Daily Energy Expenditure) adds the calories burned by daily activity and exercise.
Does BMR change with age?
Yes. BMR usually falls slowly with age, mainly because of loss of muscle mass. Strength training can help slow this down.
Results are estimates for general information and are not medical or veterinary advice. Please speak to a qualified professional about your own situation.