BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation.
How to Use the BMR Calculator
Select your gender and enter your age.
Choose between metric or imperial units.
Enter your height and weight.
The calculator will automatically display your estimated BMR, which is the number of calories your body needs at rest.
Frequently Asked Questions
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to accomplish its most basic (basal) life-sustaining functions.
How is this different from TDEE?
BMR is your calorie needs at rest. Total Daily Energy Expenditure (TDEE) also includes calories burned from physical activity. Your TDEE will always be higher than your BMR unless you are completely sedentary.
Is this calculator accurate?
It uses the Mifflin-St Jeor equation, which is considered one of the most accurate methods for estimating BMR. However, it is still an estimate.
What this tool is for
The BMR calculator estimates basal metabolic rate, which is the energy your body may use at rest for basic functions. Enter age, sex, height, and weight to calculate an estimate using the Mifflin-St Jeor equation. BMR is not the same as total daily energy expenditure, because daily activity, exercise, digestion, medical conditions, and individual metabolism can change actual calorie needs. Use the result as a planning estimate, not a diagnosis or medical prescription.
Common tasks
Estimate resting calorie needs from basic body measurements.
- Estimate resting calorie needs.
- Use BMR as a starting point for TDEE.
- Compare metric and imperial inputs.
- Plan nutrition targets more carefully.
Privacy and limits
Health calculations are estimates. Speak with a qualified clinician or dietitian for medical or nutrition decisions.
Maintained by Conversores Online. Last reviewed: May 29, 2026
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