Calculate the number of calories your body burns at rest, plus your daily needs by activity level.
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic life functions — breathing, circulation, cell production — while completely at rest. It's the foundation for figuring out your total daily calorie needs.
This calculator uses the Mifflin-St Jeor equation, widely considered one of the most accurate:
Men: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age + 5
Women: BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 161
A 30-year-old man weighing 70kg and 175cm tall has a BMR of (10×70) + (6.25×175) - (5×30) + 5 = 1,648.75 calories/day at complete rest.
Basal Metabolic Rate is the number of calories your body burns at complete rest just to maintain basic functions like breathing and circulation.
Most commonly the Mifflin-St Jeor equation, which factors in weight, height, age, and sex — widely considered more accurate than the older Harris-Benedict formula.
BMR is calories burned at total rest; TDEE (Total Daily Energy Expenditure) adds your activity level on top of BMR to estimate total daily calorie burn.