BMR calculator.
Estimate the energy your body uses at rest. Choose a formula, enter your measurements, and see how BMR differs from the calories you use throughout a whole day.
These tools are free to use without an account.
Estimated basal metabolic rate
1,483 kcal/dayFormula: mifflin st jeor.
BMR describes resting energy use. It is not a daily food target.
Fitness estimates for adults 18 and over, not medical or dietary advice. Results are informational and are not reviewed by a certified personal trainer.
How this BMR calculator works
The default Mifflin-St Jeor equation uses weight in kilograms, height in centimetres, age and the selected sex coefficient. Revised Harris-Benedict uses a different population equation. Katch-McArdle uses estimated lean mass; leave body fat blank and the tool falls back to Mifflin-St Jeor, with a visible note. The same formulas power One Fitness Hub nutrition estimates.
Worked example
A 35-year-old woman weighing 77.1107 kg and measuring 167.64 cm has an estimated BMR of 1,483 kcal/day with Mifflin-St Jeor. Daily movement, digestion and exercise add to that resting requirement.
Fitness estimates for adults 18 and over, not medical or dietary advice. Results are informational and are not reviewed by a certified personal trainer. Calculations stay in your browser. Typed measurements are not sent or saved.
Common questions.
Is BMR the same as TDEE?
No. BMR estimates energy used at rest. TDEE estimates a whole day, including activity. Use the TDEE and macro calculator to include daily activity.
Which BMR formula should I choose?
Mifflin-St Jeor is the default. Harris-Benedict is another population estimate. Katch-McArdle needs a useful body fat estimate; without one this tool uses Mifflin-St Jeor and says so. None measures your metabolism.
Can someone under 18 use these calorie estimates?
This tool displays estimates only for adults 18 and over. A doctor or dietitian can advise on individual energy needs.
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