Estimate the calories your body uses at rest with three established BMR equations, then view daily calorie estimates for different activity levels.
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Your estimate
Daily calorie estimates by activity
| Activity | Multiplier | Estimated calories/day |
|---|
How the estimate works
The main result uses the Mifflin–St Jeor equation. We also show the revised Harris–Benedict estimate for comparison. If body-fat percentage is supplied, the Katch–McArdle equation estimates resting needs from lean body mass.
Male: 10 × kg + 6.25 × cm − 5 × age + 5
Female: 10 × kg + 6.25 × cm − 5 × age − 161
BMR is not the same as daily calorie need. Total daily energy expenditure (TDEE) multiplies BMR by an activity factor and remains an estimate.
Frequently asked questions
What is BMR?
Basal metabolic rate is an estimate of the energy required for basic functions such as breathing, circulation, and temperature regulation at rest.
Which BMR equation is best?
Mifflin–St Jeor is widely used for adults, but no equation is exact for everyone. Comparing formulas and observing real trends provides useful context.
Can I use BMR alone for weight planning?
No. BMR excludes normal movement, exercise, and digestion. Use an estimated TDEE as a starting point and consult a qualified professional for individualized guidance.