Estimate basal metabolic rate using the Mifflin-St Jeor and Harris-Benedict formulas. This free BMR calculator supports men and women, US and metric units, and shows daily calorie estimates at rest and across common activity levels.
Mifflin-St Jeor:
A widely used formula for estimating resting calorie needs from weight, height, age, and sex.
Harris-Benedict:
A classic BMR formula that also uses weight, height, age, and sex.
Activity estimates:
BMR can be multiplied by activity factors to estimate daily calorie needs beyond rest.
Practical use:
This calculator shows both resting calories and adjusted daily estimates in one place.
BMR is often used as the starting point for calorie planning, weight loss estimates, maintenance intake, and nutrition calculations.
It helps show the baseline number of calories your body may need before normal daily activity is considered.
Your result shows BMR from two common formulas plus estimated daily calories across several activity levels.
This gives you both a resting-calorie reference and a practical daily planning reference.
BMR stands for basal metabolic rate. It estimates how many calories your body uses at rest to support basic functions.
No. BMR is resting calorie use, while TDEE includes activity and daily movement.
Mifflin-St Jeor is commonly used today, but both formulas can be useful reference points.
Activity, muscle mass, lifestyle, food tracking accuracy, and metabolism can all affect real calorie needs.