BMR Calculator
Enter sex, age, height, weight, and activity level to compare BMR and TDEE with the Mifflin–St Jeor or revised Harris–Benedict formula. Profiles stay in your browser.
Profiles are saved only in this browser and are not sent to a server.
Enter your details to see the results.
TDEE comparison by activity level
These estimates multiply BMR by each activity factor. Compare routines with the same profile.
| Activity level | Factor | TDEE (kcal/day) |
|---|
Saved profiles
Save up to 10 profiles and calculate again later.
No saved profiles.
How to use
- Choose a formula, units, sex, and activity level.
- Enter adult age, height, and weight.
- Review BMR, the selected TDEE, and the activity-level comparison.
- Name and save settings you will reuse as a profile.
Calculation basis and verification sources
Mifflin–St Jeor is 10W + 6.25H − 5A + 5 for men and 10W + 6.25H − 5A − 161 for women. The revised Harris–Benedict equation is also shown for comparison. W is kg, H is cm, A is age in years, and TDEE is an estimate made by multiplying the selected BMR by an activity factor.
Evidence checked: 2026-08-07. The studies provide adult prediction equations; the activity presets are neither individual measurements nor diagnostic thresholds from those papers. Indirect calorimetry and professional assessment take priority for disease, pregnancy, growth, or athletic nutrition planning.
Frequently asked questions
What is basal metabolic rate (BMR)?
BMR is an estimate of resting energy needed to sustain life. This calculator lets you select and compare the Mifflin–St Jeor and revised Harris–Benedict formulas.
How is TDEE calculated?
The daily calories you actually burn are estimated by multiplying the BMR by an activity-level factor. The more active you are, the larger the factor.
Is the information I enter sent to a server?
No. All calculations and optional profile storage stay in your browser and are not sent to a server.
This calculator gives general adult estimates; actual metabolism varies with individual condition and measurement settings. It does not replace medical or nutrition prescriptions or diagnosis. Consult a professional for health decisions.