BMR Calculator - Basal Metabolic Rate Calculator Online
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Supports metric and imperial units. Free online BMR calculator.
Enter your details above to calculate your BMR.
What is BMR Calculator?
BMR (Basal Metabolic Rate) Calculator estimates the number of calories your body burns at complete rest to maintain basic functions like breathing, circulation, and cell production. It uses the Mifflin-St Jeor equation, which is considered the most accurate formula for most people. Knowing your BMR is the first step in calculating your daily calorie needs.
How to Calculate BMR
- Select your biological sex
- Enter your age, weight, and height
- Choose metric or imperial units
- Your BMR appears instantly in calories per day
BMR Calculator Features
- Uses the Mifflin-St Jeor equation (most accurate for most people)
- Supports metric (kg/cm) and imperial (lb/ft+in)
- Instant real-time calculation
- Separate formulas for male and female
- No data sent to any server
BMR Calculator FAQ
What is BMR?
BMR (Basal Metabolic Rate) is the number of calories your body needs to maintain basic life functions at complete rest — breathing, circulation, temperature regulation, and cell repair.
What is the Mifflin-St Jeor equation?
For men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5. For women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161. It is widely considered the most accurate BMR formula for most adults.
How is BMR different from TDEE?
BMR is your calorie need at complete rest. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor to estimate how many calories you actually burn per day.