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Basal Metabolic Rate

BMR Calculator

Estimate how many calories your body burns at rest, then use it as the foundation for weight, nutrition, and fitness planning.

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Estimated BMR
0kcal/day

How to Read Your Result

BMR is the energy your body needs for essential functions such as breathing, circulation, temperature regulation, and cell repair. It is not your total daily calorie burn; activity and digestion add to this number.

Use BMR as the baseline for a TDEE calculation.
Muscle mass, thyroid function, illness, and long-term dieting can change real-world energy needs.
For weight loss, do not eat far below BMR without medical supervision.

How to use BMR for weight loss

BMR is not a weight-loss calorie target. First estimate TDEE by multiplying BMR by an activity factor, then create a moderate deficit from TDEE. Use the TDEE Calculator for maintenance calories or the Calorie Deficit Calculator to plan a timeline.

BMR formulas used here

Without body fat, the main result uses Mifflin-St Jeor and also shows Harris-Benedict for comparison. When you enter body fat percentage, the main result switches to Katch-McArdle, which estimates metabolism from lean body mass.

Frequently Asked Questions

What is BMR?
BMR is your basal metabolic rate: the estimated calories your body burns at complete rest to keep vital systems running.
Which BMR formula is best?
Mifflin-St Jeor is widely used for adults and is usually a strong starting point. Harris-Benedict is also shown for comparison.
Can I calculate BMR with body fat percentage?
Yes. Enter your body fat percentage and the calculator switches to the Katch-McArdle formula, which is based on lean body mass and can be more accurate for lean or muscular people.
Is BMR the same as TDEE?
No. TDEE includes BMR plus calories burned through daily activity, exercise, and digestion.
How do I use BMR to lose weight?
Do not subtract calories directly from BMR. Convert BMR to TDEE using your activity level, then create a moderate deficit from TDEE.