Basal Metabolic Rate Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. BMR is the number of calories your body needs at rest to maintain basic functions.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the BMR Calculator
- Enter your age in years (1–150).
- Select your gender (Male or Female).
- Enter your weight in kilograms (1–700 kg).
- Enter your height in centimeters (1–300 cm).
- Click "Calculate BMR".
What you get: Your Basal Metabolic Rate (BMR) in kcal/day — the calories your body needs at complete rest. The result uses the Mifflin-St Jeor equation.
Note: All inputs must be in metric units (kg and cm). Invalid entries show a red error.
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Frequently Asked Questions
BMR is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at rest.
This calculator uses the Mifflin-St Jeor equation: For men: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(y) + 5; For women: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(y) - 161.
BMR varies by age, gender, weight, and height. For an average adult, BMR ranges from 1200 to 2000 kcal/day. Use the calculator to get your personalized estimate.
