BMR Calculator

Calculate your Basal Metabolic Rate—the calories your body burns at rest.

About BMR Calculator

Want to understand your metabolism? Use the Free BMR Calculator. It is the Best Basal Metabolic Rate Tool to see exactly how much energy your body needs just to stay alive.

Features

Calculates pure Basal Metabolic Rate without exercise variables
Uses the Mifflin-St Jeor equation
Essential starting point for macro and diet planning
Supports Metric and Imperial inputs
Fast, private, and localized processing

How to Use

Select your biological Gender.
Enter your Age in years.
Enter your Height and Weight.
Click calculate to see your BMR.

Frequently Asked Questions

What is BMR?

Basal Metabolic Rate is the number of calories your body requires to perform its most basic, life-sustaining functions (breathing, circulation, cell production) if you stayed in bed all day.

What is the difference between BMR and TDEE?

BMR is calories burned at rest. Total Daily Energy Expenditure (TDEE) takes your BMR and adds the calories you burn through walking, working, and exercising.

Does muscle mass affect BMR?

Yes. Muscle tissue burns more calories at rest than fat tissue. Standard BMR calculators estimate based on average body compositions. Very muscular individuals will have a slightly higher actual BMR.

Why does BMR decrease with age?

As people age, they generally lose muscle mass and their cellular processes slow down, requiring fewer calories to sustain the body.

What is the difference between BMR and TDEE?

BMR is calories burned in a coma-like state. TDEE adds the calories you burn moving around.

Is BMR different for men and women?

Yes, biological gender affects muscle mass averages, which alters the BMR formula.

Does age affect BMR?

Yes, metabolism naturally slows down as you get older, which this tool accounts for.

Is this a free bmr calculator?

Yes, this free bmr calculator is entirely free.

Why use the best basal metabolic rate tool?

It gives you the foundational number needed for any serious diet plan.

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