Calculate BMR
Estimate your Basal Metabolic Rate using the information you provide.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) and estimate how many calories your body needs at rest. Enter your age, sex, height, and weight to get your estimated daily calorie requirements.
BMR Details
Enter your personal measurements
kcal
years
BMR Result
Estimated daily calorie needs
kcal
Basal Metabolic Rate
0 kcal
Enter your details to calculate your BMR.
Weight
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Height
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BMR
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Estimated Daily Calories
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Calculation Method
Mifflin–St Jeor equation
FREE ONLINE BMR CALCULATOR — NO SIGN UP REQUIRED
BMR Calculator
Calculate Your Basal Metabolic Rate
Calculate your Basal Metabolic Rate (BMR) using your age, sex, height, and weight. Get an estimate of the calories your body needs to support basic functions while at rest.
Useful for general health awareness, calorie planning, fitness tracking, and understanding how your body uses energy at rest.
100% Free
Instant Results
Easy to Use
Browser Based
Quick Tool Overview
The All Free Tool's BMR Calculator estimates your Basal Metabolic Rate using information such as age, sex, height, and weight. BMR represents an estimate of the energy your body uses to support essential functions while at rest.
Your body uses energy continuously for essential processes such as breathing, circulation, and maintaining normal body functions. BMR calculations provide an estimate of this resting energy requirement.
BMR is different from total daily calorie expenditure because daily activity, exercise, digestion, and other factors also contribute to the energy your body uses throughout the day.
About the BMR Calculator
What Is BMR?
Basal Metabolic Rate (BMR) is an estimate of the amount of energy the body requires to maintain essential physiological functions while at rest.
What Information Is Needed?
BMR calculations commonly use information such as age, sex, height, and weight. Entering accurate measurements helps produce a more useful estimate.
BMR vs. TDEE
BMR estimates resting energy needs, while Total Daily Energy Expenditure (TDEE) takes activity and other daily energy requirements into account. BMR should therefore not be treated as the number of calories you need for your entire day.
How the BMR Calculator Works
Enter your personal measurements into the calculator. The tool applies its selected BMR formula to your information and displays an estimated resting metabolic rate.
What BMR Cannot Tell You
BMR is an estimate and does not directly measure your actual metabolism. Individual energy needs can vary because of factors such as body composition, activity, health status, and other personal characteristics.
Key Features
Age Input
Enter your age as one of the values used in the BMR calculation.
Height Input
Enter your height using the measurement units supported by the calculator.
Weight Input
Enter your current weight to help calculate your estimated resting energy requirement.
Sex Selection
Select the applicable sex option when required by the BMR formula used by the calculator.
Unit Support
Use the available height and weight units that match your measurements.
Instant Results
Get your estimated BMR immediately after entering the required information.
Calorie Reference
Use the BMR result as a general reference when learning about resting energy requirements.
Fitness Planning
Use your estimated BMR as one starting point when learning about calorie and fitness planning.
Browser Based
Calculate BMR directly in your browser without installing additional software.
How to Use the BMR Calculator
Follow these simple steps to calculate your estimated Basal Metabolic Rate.
Open the BMR Calculator
Open the BMR Calculator and prepare your current age, height, and weight information.
Pro Tip: Use accurate measurements for a more useful BMR estimate.
Select Your Units
Select the height and weight units that match the measurements you plan to enter.
Pro Tip: Make sure the selected units match the values you enter.
Enter Your Age
Enter your current age in the appropriate field.
Pro Tip: Enter your age accurately because it is used by common BMR calculation formulas.
Select Your Sex
Select the applicable option if the calculator's BMR formula requires sex as an input.
Pro Tip: Check which formula the calculator uses if you are comparing results with another tool.
Enter Your Height
Enter your height using the selected measurement unit.
Pro Tip: Use a recent height measurement and avoid guessing when possible.
Enter Your Weight
Enter your current weight using the selected weight unit.
Pro Tip: Consistent measurement conditions can make personal tracking easier.
Calculate Your BMR
Click the calculate button to process your information and estimate your BMR.
Pro Tip: Review all entered values before calculating your result.
Review Your BMR Result
Review the estimated number displayed by the calculator as your resting metabolic rate.
Pro Tip: Remember that BMR is an estimate, not a direct measurement of metabolism.
Consider Activity Level Separately
Remember that your daily calorie needs also depend on physical activity and other factors, not just your BMR.
Pro Tip: Do not use BMR alone as your total daily calorie requirement.
Use the Result Responsibly
Use your estimated BMR for general health awareness and as one reference when learning about energy requirements.
Pro Tip: For personal nutrition or medical decisions, consider guidance from a qualified healthcare professional.