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BMR Calculator

Estimate basal metabolic rate with the Mifflin-St Jeor equation using age, sex, weight, and height.

Quick Guide

Quick answer

BMR Calculator: BMR Calculator helps turn health and body metrics inputs into a clear result you can compare, explain, and use for a practical decision.

Formula / core ruleBMR estimates daily calories used at rest from age, sex, height and weight

This section explains the main calculation rule in a simple and practical way.

ExampleChanging weight, age or sex changes the estimated resting calorie need.

Use this example to better understand how the calculation works.

Common mistakeTreating BMR as total daily energy use without activity adjustment.

Checking this point reduces the chance of a misleading result.

How to interpret the result

BMR is a baseline estimate before exercise and daily movement are added.

Methodology

This calculator reads the visible input fields, applies the arithmetic for bmr calculator, and displays the result immediately in the result panel. The page keeps the answer, formula, example and explanation together so the calculation is easier to verify and easier for search systems to understand.

Reviewed by CalcBeacon Editorial TeamUpdated May 2026Category: Health CalculatorsTransparent formula and example

Enter your numbers

Sex

Age

Weight (kg)

Height (cm)

Formula: Mifflin-St Jeor equation

Result

Health result panel

Main result

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Per day—

Per week—

How it works

How this calculator works

Estimate basal metabolic rate with the Mifflin-St Jeor equation using age, sex, weight, and height.

Method

Use the calculator inputs to estimate the result instantly based on the values entered.

Example

Enter a realistic example in each field, then compare the output and adjust the inputs to test a second scenario.

Practical Guide

Understanding the result

Health calculators can help estimate body metrics, nutrition targets, and fitness-related values. They should be used as general guidance rather than medical advice.

What the result means

Health-related calculations are estimates and should be interpreted alongside lifestyle, medical, and fitness factors.

Typical considerations

Healthy ranges vary between individuals
Consistency matters more than short-term changes
Professional advice may still be needed

Example

Use realistic daily or weekly values when comparing nutrition, activity, or body measurements.

Common mistakes

Comparing yourself to unrealistic standards
Ignoring long-term trends
Using incorrect units

Frequently asked questions

What does the bmr calculator show?

It gives you a fast estimate based on the values you enter on this page.

Is this bmr calculator free to use?

Yes. CalcBeacon tools are designed for quick free use in the browser.

Tool guide

How to use the bmr calculator

Estimate basal metabolic rate with the Mifflin-St Jeor equation using age, sex, weight, and height. Use this page for a fast estimate, compare a few scenarios, and adjust the inputs until the result matches what you need to decide.

This tool also sits inside the CalcBeacon health cluster. That makes it easier to find from category pages, related tools, and supporting guides when you want to compare options.

When it is usefulUse this tool when you want a fast estimate, want to compare options, or want a clearer answer before moving on.

Common mistakesCheck that your numbers use the same units, avoid leaving key fields blank, and test a second scenario so you can see how sensitive the final result is.

Next useful stepAfter using this page, compare the result with a related calculator or open the guide to check the number in context.

Related tools

Use these related tools to compare nearby calculations and move to the next step faster.