Fitness
BMR Calculator
Calculate your Basal Metabolic Rate β the calories your body burns at complete rest β using the Mifflin-St Jeor equation.
Basal Metabolic Rate
β
How It Works
Mifflin-St Jeor: BMR = 10Γweight(kg) + 6.25Γheight(cm) β 5Γage + 5 (men) or β161 (women). It estimates the calories needed just to keep your body running at rest.
Example
A 30-year-old man, 70 kg and 175 cm: 700 + 1093.75 β 150 + 5 = 1,649 kcal/day.
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR is calories at complete rest. TDEE multiplies BMR by an activity factor (1.2 sedentary to 1.9 very active) to get your real daily burn.
How do I use BMR to lose weight?
Estimate your TDEE from BMR and activity, then eat roughly 300β500 kcal below it for gradual, sustainable loss.
Is Mifflin-St Jeor accurate?
It is the equation most recommended by dietitians and is typically within ~10% for most adults. Muscle mass, genetics, and hormones cause variation.