Is this the same as the calorie calculator?

This tool exposes BMR as its own standalone figure; the site's Calorie Calculator computes the same underlying BMR internally but leads with the TDEE (total daily calorie) result instead.

Is this accurate for athletes or people with a lot of muscle mass?

Formula-based BMR tends to be less accurate for very muscular or very lean individuals, since it doesn't directly measure body composition — a DEXA scan or metabolic cart test would be more precise.

Is this medical advice?

No — it's a general estimate. Consult a doctor or registered dietitian for personalized nutrition guidance.

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Health & Fitness

BMR Calculator

Basal metabolic rate via the Mifflin-St Jeor equation, plus daily-calorie estimate.

🔒 Runs entirely in your browser — nothing here is ever uploaded

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Last reviewed 2026-09-05

About the BMR Calculator

Basal Metabolic Rate — the calories your body burns at complete rest — via the Mifflin-St Jeor equation, the formula most dietitians and clinicians use today.

100% Free Runs in Your Browser No Sign-Up Required

How to use it

Enter your sex, age, height, and weight.
Optionally pick an activity level to see an estimated total daily calorie burn (TDEE).
Read your BMR and TDEE below.

Formula

Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5
Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161

Worked example

30-year-old male, 80 kg, 180 cm → BMR = 800 + 1125 − 150 + 5 = 1,780 kcal/day. At a moderate activity level (×1.55), estimated TDEE ≈ 2,759 kcal/day.

Recommendations

• BMR alone doesn't include any activity — it's the calories burned by organs and basic function at complete rest.
• TDEE (BMR × activity multiplier) is the more useful number for daily calorie planning.
• This is a population-average formula — true metabolic rate varies by body composition, genetics, and some medical conditions it can't capture.

Frequently asked questions

Mifflin-St Jeor (1990) has been shown in validation studies to predict resting energy expenditure more accurately on average than the older 1919 Harris-Benedict equation, and is the equation most current clinical/dietetic guidance recommends.