BMR Calculator (with TDEE)
Find your basal metabolic rate and daily calorie needs (TDEE).
BMR (basal metabolic rate) is the energy your body uses at rest, via the Mifflin-St Jeor equation. TDEE multiplies BMR by your activity level — roughly the calories to maintain your weight. A general estimate, not medical advice. Runs in your browser.
Results are general estimates for information only, not medical advice — consult a qualified professional for health decisions. See how we build our calculators.
Work out your BMR — the calories your body burns at complete rest — using the Mifflin-St Jeor equation, the most accurate of the common formulas. Then see your TDEE, the total daily energy you need to maintain your weight at your activity level. Enter your details in metric or imperial. A general estimate for information, not medical advice.
How to use the BMR Calculator
- Pick metric or imperial and enter sex, age, weight and height.
- Choose your activity level.
- Read your BMR and TDEE (maintenance calories).
Frequently asked questions
What's the difference between BMR and TDEE?
BMR is the energy your body uses at rest just to stay alive. TDEE (total daily energy expenditure) is BMR multiplied by an activity factor — roughly the calories you burn in a normal day, and what you'd eat to maintain weight.
Which formula does it use?
The Mifflin-St Jeor equation, which research finds more accurate for most people than the older Harris-Benedict formula.
How do I lose or gain weight from this?
Eat below your TDEE to lose weight or above it to gain — a deficit or surplus of about 500 calories a day changes weight by roughly 0.5 kg (1 lb) a week. Consult a professional for personalised advice.