Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Free online BMR calculator with formula, examples, and FAQ.
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic, life-sustaining functions while at complete rest. These include breathing, circulation, nutrient processing, and cell production. Knowing your BMR helps you understand your daily calorie needs for weight management, whether you want to lose, maintain, or gain weight.
Male: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age + 5
Female: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 161The Mifflin-St Jeor equation is widely regarded as the most accurate BMR formula. It calculates the base metabolic rate by considering weight, height, age, and gender. The constant +5 for males and -161 for females accounts for the difference in muscle mass and body composition between genders.
| Input | Output |
|---|---|
| Male, 70 kg, 175 cm, 30 years | BMR: 1,668 kcal/day |
| Female, 60 kg, 165 cm, 25 years | BMR: 1,370 kcal/day |
| Male, 85 kg, 180 cm, 40 years | BMR: 1,780 kcal/day |