Free BMR calculator using the Mifflin-St Jeor equation: enter sex, age, height and weight to estimate your resting basal metabolic rate. Estimate only. 100% Local
How to Use the BMR Calculator
Choose your sex, then enter age, height and weight, and press Calculate BMR. The result updates as you type.
About the formula
This tool uses the Mifflin-St Jeor equation, a widely used estimate for adults.
It returns the energy your body would use at complete rest for a full day.
BMR is a starting point; multiply it by an activity factor for total daily needs.
Features
Mifflin-St Jeor basal metabolic rate for adults
Sex-specific equation
Rounded kcal/day result
All processing runs locally in your browser. Your data is not uploaded to any server.