BMR Calculator: Basal Metabolic Rate and Daily C...

What is Basal Metabolic Rate (BMR)?

Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions — breathing, circulation, and cell production — while at complete rest. It represents the minimum energy expenditure required to keep you alive.

🔥 BMR Calculator

Use our free calculator for instant, accurate results.

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📐 Formula

BMR (Men) = 10×W + 6.25×H − 5×A + 5

Mifflin-St Jeor Equation: W = weight (kg), H = height (cm), A = age (years). For women, use −161 instead of +5.

📝 Worked Example

A 30-year-old male, 80 kg, 178 cm:
BMR = (10×80) + (6.25×178) − (5×30) + 5 = 800 + 1112.5 − 150 + 5 = 1,767.5 kcal/day

📝 How to Use the Calculator

Enter Personal DetailsInput your gender, age, height, and weight.

Select FormulaChoose Mifflin-St Jeor (recommended) or Harris-Benedict.

Pick Activity LevelSelect from sedentary to very active to get your TDEE (Total Daily Energy Expenditure).

View Calorie TargetGet BMR and TDEE with calorie goals for loss, maintenance, and gain.

❓ FAQ

What is the difference between BMR and TDEE?

BMR is calories burned at rest. TDEE multiplies BMR by an activity factor to give total daily calorie needs.

Which BMR formula is most accurate?

The Mifflin-St Jeor equation is considered most accurate for most adults according to the Academy of Nutrition and Dietetics.