Units, Sex, Age, Weight, Height
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How this calculator works
Basal metabolic rate is the energy you would use lying still for 24 hours: breathing, circulation, keeping warm. This calculator uses the Mifflin-St Jeor equation, which studies have found to be the closest of the common equations for most adults, and shows the revised Harris-Benedict figure for comparison.
Formula
- Mifflin-St Jeor (men): 10 × kg + 6.25 × cm − 5 × age + 5
- Mifflin-St Jeor (women): 10 × kg + 6.25 × cm − 5 × age − 161
- Revised Harris-Benedict (men): 88.362 + 13.397 × kg + 4.799 × cm − 5.677 × age
- Revised Harris-Benedict (women): 447.593 + 9.247 × kg + 3.098 × cm − 4.330 × age
Worked example
30-year-old man, 70 kg, 175 cm
- Units
- Metric (kg, cm)
- Sex
- Male
- Age
- 30
- Weight
- 70
- Height
- 175
Result1,649 kcal/day
Estimated calories burned at complete rest (Mifflin-St Jeor).
Things to keep in mind
- Equations estimate the average person. Individual BMR can differ by 10% or more, especially with very high or low muscle mass.
- For general information only. It is not medical advice; talk to a health professional about your own situation.
Frequently asked questions
What is the difference between BMR and TDEE?
BMR is the energy you burn at rest. TDEE (total daily energy expenditure) adds everything else: movement, exercise and digesting food. TDEE is BMR multiplied by an activity factor.
Which BMR equation is the most accurate?
For most healthy adults the Mifflin-St Jeor equation predicts measured resting energy use more closely than Harris-Benedict, which tends to run a little high.
Should I eat fewer calories than my BMR?
Generally no. BMR is what your body needs just to function. Weight-loss plans are normally set below TDEE, not below BMR.
Sources
More health & fitness calculators
Results are estimates based on the values you enter and the published method shown above. They do not replace professional medical, financial or legal advice. Method reviewed October 7, 2026. About this site