BMR Calculator
Your Basal Metabolic Rate (BMR) is the calories your body burns at rest just to keep functioning. Enter your age, weight, height and gender to calculate your BMR and daily calorie needs.
Not medical advice General estimate only. Individual calorie needs vary. Consult a nutritionist or medical professional for personalized advice.
BMR Calculator
Calories your body burns at rest
BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age(y) + 5 (male) or −161 (female). Daily calories = BMR × activity factor.
⚠️ Double-check important results. This is an educational estimate, not professional advice — and where it uses a rate, bracket or fee, those change over time. Verify anything you'll rely on, especially in legal, financial, tax or medical matters, and read our full disclaimer. Think a result is wrong? Tell us so we can fix it.
What Is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to keep vital organs functioning — breathing, circulation, cell production, nutrient processing.
This calculator uses the **Mifflin-St Jeor equation**, considered one of the most accurate BMR formulas:
Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age(y) + 5 Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age(y) − 161
Daily calorie needs = BMR × activity factor (1.2 sedentary to 1.9 extra active).
To lose weight, eat ~500 calories below maintenance. To gain, eat ~500 above.
- Mifflin-St Jeor equation
- BMR = calories at complete rest
- Multiply by activity factor for daily needs
- ±500 calories for weight loss/gain
Worked Example
Example: 30-year-old male, 70 kg, 170 cm, moderately active.
- BMR = 10×70 + 6.25×170 − 5×30 + 5 = 700 + 1062.5 − 150 + 5 = 1,617.5 kcal/day - Maintenance = 1,617.5 × 1.55 ≈ 2,507 kcal/day - Weight loss = ~2,007 kcal/day - Weight gain = ~3,007 kcal/day
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Open calculator →Frequently Asked Questions
BMR vs. TDEE — what's the difference?
BMR is calories burned at complete rest. TDEE (Total Daily Energy Expenditure) = BMR × activity factor, which includes all movement and exercise throughout the day.
How accurate is this?
The Mifflin-St Jeor equation is within ~10% of measured BMR for most people. Individual metabolism varies, so treat results as a starting point and adjust based on real-world progress.
Looking for a different calculator?
CalculatorPlus has free tools across finance, construction, math, health and more — each one showing the formula and a worked example.