How to use the BMR Calculator tool
3 simple steps · under a minute
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Choose your units
Use US units (pounds, feet and inches) or metric.
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Enter your details
Type your sex, age, height and weight.
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Read your BMR
See your BMR from two formulas and your calories for each activity level.
About BMR calculator
Basal metabolic rate (BMR) is the number of calories your body needs to keep you alive at complete rest — breathing, circulating blood and repairing cells. It usually makes up 60–70% of the calories you burn each day. This BMR calculator estimates it with two well-known equations.
Your BMR depends mainly on your size, age and sex: larger bodies and more muscle burn more, and BMR slowly falls with age. Multiply your BMR by an activity factor to get the calories you need each day, shown in the table below the result.
Two trusted formulas
Mifflin-St Jeor and the revised Harris-Benedict equation side by side.
Calories by activity
A table of daily calories from sedentary to very active.
US or metric
Pounds, feet and inches, or kilograms and centimetres.
Frequently asked questions
What is BMR?
Basal metabolic rate — the calories your body burns at rest to keep basic functions running.
How is BMR calculated?
Mifflin-St Jeor: 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 TDEE?
BMR is calories at rest. TDEE adds the energy you use moving and exercising, so it is always higher.
How can I increase my BMR?
Building muscle through strength training raises BMR, as muscle burns more energy than fat even at rest.
Is this medical advice?
No. Estimates can differ from a measured metabolic rate.