Health calculator
BMR Calculator
Estimate basal metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation.
Formula
BMR formula
BMR is an estimate of resting energy use. It is not a medical test.
Men: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161
A 30-year-old man at 80 kg and 180 cm has BMR = 10x80 + 6.25x180 - 5x30 + 5 = 1,780.
Sources and assumptions
Source notes
This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
- Effective year
- Current rules
- Last verified
- 2026-06-18
BMR is an estimate of resting energy use. It is not a medical test.
Official and reference sources
Assumptions
- The Mifflin-St Jeor male or female constant is selected from the sex input.
Not included
- Measured resting energy expenditure, pregnancy, growth, illness, medication effects, and individualized clinical nutrition.
FAQs
Is BMR the same as daily calories?+
No. BMR estimates resting energy use; daily calories also depend on activity.
Which formula does this use?+
It uses the Mifflin-St Jeor equation, a common modern estimate for adults.
How does the BMR Calculator calculate the result?+
It uses the BMR formula: Men: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161. A 30-year-old man at 80 kg and 180 cm has BMR = 10x80 + 6.25x180 - 5x30 + 5 = 1,780.
What information do I need to use the BMR Calculator?+
Estimate basal metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation.
How accurate is the BMR Calculator?+
BMR Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the BMR Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Health guide
How to use the BMR Calculator
Estimate basal metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation. The page also explains the BMR formula and shows a practical example: A 30-year-old man at 80 kg and 180 cm has BMR = 10x80 + 6.25x180 - 5x30 + 5 = 1,780.
- 1
Enter your details
Enter age, sex, height, and weight, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the BMR formula: Men: 10w + 6.25h - 5a + 5; Women: 10w + 6.25h - 5a - 161.
- 3
Compare scenarios
Change one or more inputs to see how they affect the BMR Calculator result before you use the estimate.
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