MyCalculatorHow it works
Using the Mifflin-St Jeor equation: Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5. Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161.
Example
A 30-year-old man weighing 70 kg at 175 cm has an estimated BMR of about 1,674 calories/day — the energy his body uses at complete rest.
Assumptions & limitations
This equation is a population-average estimate and doesn't account for individual differences in muscle mass, hormones or metabolic conditions. It estimates rest-only calorie burn, not total daily needs — see the calorie calculator for that.
Frequently asked questions
What's the difference between BMR and total daily calories?
BMR is calories burned at complete rest. Total daily needs (see our calorie calculator) add activity level on top of BMR.
Why does sex affect the formula?
The Mifflin-St Jeor equation accounts for typical differences in body composition between sexes; it's a population average, not exact for every individual.