Health Tools

Resting Metabolic Rate Calculator

Estimate resting metabolic rate from age, sex, height, and weight.

Updated April 16, 2026
Free online tool
Planning and research use

Why this page exists

Energy-planning estimates get easier when age, sex, height, and weight are turned into one resting-calorie baseline instead of being guessed. This calculator helps visitors estimate resting metabolic rate from standard body-stat inputs using a common formula.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Resting metabolic rate calculator

Estimate resting metabolic rate from age, sex, height, and weight using a standard formula.

Preparing the interactive calculator and result tools...

Planning note

Last updated April 16, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose imperial or metric measurements and enter age, sex, height, and weight.

The calculator converts the body stats to a common basis when needed.

It applies the Mifflin-St Jeor formula to estimate resting metabolic rate per day.

Understanding your result

This is a general metabolic estimate, not medical advice. Real resting energy needs can shift with body composition, health status, hormones, and measurement method.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Find a resting calorie baseline

A resting metabolic rate estimate can give a useful baseline before activity is added on top.

Compare two body-stat snapshots

Using the same method across two sets of body stats can make broad change easier to compare.

Use it with calorie-planning tools

RMR estimates often fit naturally beside maintenance-calorie, macro, and deficit-planning tools.

FAQ

Common questions

How is resting metabolic rate estimated here?

The calculator uses the Mifflin-St Jeor formula with age, sex, height, and weight to estimate resting calories per day.

Is this the same as daily maintenance calories?

No. Resting metabolic rate is a baseline resting estimate and does not include activity or exercise on top of it.

Why might the real number differ?

Body composition, health status, hormones, and direct measurement method can all move real resting energy needs higher or lower than a formula estimate.

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Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Health ToolsUpdated April 11, 2026