BMR Calculator

Calculate your Basal Metabolic Rate and daily calorie needs

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BMR Calculator

Calculate your Basal Metabolic Rate (BMR) - the amount of energy your body needs at rest to maintain vital functions. This is essential for determining daily calorie needs and planning nutrition goals.

📏 Personal Information

Ages: 15 - 80

cm
kg

📊 BMR Results

Your BMR
1,605
Calories/day

Daily Calorie Needs by Activity Level

Activity Level Calories
Sedentary: little or no exercise 1,926
Exercise 1-3 times/week 2,207
Exercise 4-5 times/week 2,351
Daily exercise or intense exercise 3-4 times/week 2,488
Intense exercise 6-7 times/week 2,769
Very intense exercise daily, or physical job 3,050

Exercise: 15-30 minutes of elevated heart rate activity.
Intense exercise: 45-120 minutes of elevated heart rate activity.
Very intense exercise: 2+ hours of elevated heart rate activity.

Mifflin-St Jeor Formula

Most accurate formula for most people, developed in 1990 and widely recommended by nutritionists.

📚 Understanding BMR

What is BMR?

Basal Metabolic Rate is the number of calories your body needs to perform basic physiological functions like breathing, circulation, and cellular repair while at complete rest.

Why BMR Matters

BMR accounts for 60-75% of total daily energy expenditure in sedentary individuals. Understanding your BMR helps create accurate nutrition and weight management plans.

Factors Affecting BMR

Age, gender, body composition, genetics, climate, and hormonal changes all influence your BMR. Muscle tissue burns more calories than fat tissue at rest.

Mifflin-St Jeor Formula
Most accurate for general population
Men: BMR = 10W + 6.25H - 5A + 5
Women: BMR = 10W + 6.25H - 5A - 161
Harris-Benedict Formula
Classic formula, revised in 1984
Men: BMR = 13.397W + 4.799H - 5.677A + 88.362
Women: BMR = 9.247W + 3.098H - 4.330A + 447.593
Katch-McArdle Formula
Best for lean individuals with known body fat
BMR = 370 + 21.6(1 - F)W
W = weight (kg), H = height (cm), A = age, F = body fat (%)