BMR Calculator — fast
Calculate Basal Metabolic Rate and daily calorie needs.
How to use BMR Calculator
Select Your Biological Sex
Click the 'Male' or 'Female' radio button at the top of the calculator. This is required because BMR calculations differ between sexes due to body composition variations.
Enter Your Age in Years
Type your age into the 'Age' input field. Use whole numbers only (example: 25, 45, 67). Age significantly affects metabolic rate as metabolism naturally decreases with age.
Input Your Height
Select your preferred unit (cm or inches) from the dropdown, then enter your height in the 'Height' field. Example: 175 cm or 5'10". Height is used in the Mifflin-St Jeor equation to calculate BMR.
Enter Your Current Weight
Choose your weight unit (kg or lbs) from the dropdown menu, then input your weight. Example: 75 kg or 165 lbs. Muscle mass and weight directly impact your basal metabolic rate.
Choose Your Activity Level
Select from the 'Activity Level' dropdown: Sedentary, Lightly Active, Moderately Active, Very Active, or Extra Active. This multiplier calculates your Total Daily Energy Expenditure (TDEE) from your BMR.
Click Calculate Button
Press the green 'Calculate BMR' button. Results display instantly below showing your BMR (calories at rest) and TDEE (daily calories burned including activity).
Review Your Results
View your Basal Metabolic Rate in calories/day and your Total Daily Energy Expenditure. Use TDEE for weight loss (subtract 500 calories) or weight gain (add 300-500 calories) calculations.