BMR Calculator | Accurate Basal Metabolic Rate Estimation Tool

BMR Calculator

Calculate your Basal Metabolic Rate (BMR) - the number of calories your body needs to maintain basic physiological functions at rest.

Gender

Age (years)

Weight

lbs

Height

ft & in

Formula

Your BMR

Calories your body needs at complete rest

Daily Maintenance Calories

Based on your activity level

Activity Level Multipliers

Activity Level	Description	Multiplier
Sedentary	Little or no exercise	1.2
Lightly active	Light exercise 1-3 days/week	1.375
Moderately active	Moderate exercise 3-5 days/week	1.55
Very active	Hard exercise 6-7 days/week	1.725
Extra active	Very hard exercise & physical job	1.9

About BMR (Basal Metabolic Rate)

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to accomplish its most basic (basal) life-sustaining functions, including:

Breathing
Circulation
Cell production
Nutrient processing
Protein synthesis

Why BMR Matters

Knowing your BMR helps you understand how many calories you burn at rest. This is the foundation for determining your total daily energy expenditure (TDEE), which is essential for weight management.

BMR Formulas

This calculator offers three different formulas to estimate your BMR:

1. Mifflin-St Jeor Equation (Recommended)

Considered the most accurate for most people:

Men: (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
Women: (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161

2. Original Harris-Benedict Equation

Developed in 1919, slightly less accurate than Mifflin-St Jeor:

Men: 66.5 + (13.75 × weight in kg) + (5.003 × height in cm) - (6.755 × age in years)
Women: 655.1 + (9.563 × weight in kg) + (1.850 × height in cm) - (4.676 × age in years)

3. Revised Harris-Benedict Equation

Updated in 1984 for better accuracy:

Men: 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)
Women: 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)

How to Use Your BMR

To maintain your current weight, consume calories equal to your TDEE (BMR × activity level). To lose weight, consume fewer calories than your TDEE. To gain weight, consume more calories than your TDEE.

Limitations

BMR calculators provide estimates. Actual calorie needs may vary based on muscle mass, body composition, genetics, and other factors. For precise measurements, consider professional metabolic testing.

Menu