BMR Calculator
Calculate the calories your body needs at complete rest using the Mifflin–St Jeor equation.
Activity Level
What is a BMR Calculator
A BMR Calculator estimates the calories your body burns at complete rest to keep vital functions running, such as breathing, circulation and cell production.
BMR Formula
Mifflin–St Jeor Equation
Women: (10 × Wt) + (6.25 × Ht) − (5 × Age) − 161
Wt in kg · Ht in cm · Age in years
BMR Calculation Example
Sets a baseline for calorie planning
Foundation for calculating TDEE
Helps tailor weight goals
Tracks metabolic changes over time
Age — BMR declines as you get older
Body size — more mass burns more energy
Muscle mass — muscle is metabolically active
Gender — typically differs between men and women
BMR estimates are for general guidance only and are not a substitute for professional medical or nutritional advice. Individual metabolism can vary.
Frequently Asked Questions
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic functions at complete rest.
BMR is energy used at rest, while TDEE adds the calories burned through daily activity and exercise on top of BMR.
This calculator uses the Mifflin–St Jeor equation, widely regarded as one of the most accurate BMR formulas.
Knowing your BMR helps set realistic calorie targets for weight maintenance, loss or gain.