Health calculator

RMR Calculator - Resting Metabolic Rate

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

FormulaRMR = 10w + 6.25h - 5a + s

Formula

RMR estimate

RMR estimates are planning tools and should not replace medical, nutrition, or measured metabolic guidance.

RMR = 10w + 6.25h - 5a + s

For women, s = -161. For men, s = +5. Weight is in kg, height is in cm, and age is in years.

SourcesThis calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.

Sources and assumptions

Source notes

This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.

Effective year
Current rules
Last verified
2026-06-18

RMR estimates are planning tools and should not replace medical, nutrition, or measured metabolic guidance.

Official and reference sources

Assumptions

  • The Mifflin-St Jeor equation estimates adult resting energy expenditure from age, sex, height, and weight.
  • The result is a formula estimate, not an indirect calorimetry measurement.
  • The sedentary context multiplies RMR by 1.2 for comparison only.

Not included

  • Measured metabolic testing, pregnancy, lactation, growth, illness, medication effects, body-composition adjustment, and individualized clinical nutrition.
FAQ7 common questions for this calculator.

FAQs

Is RMR the same as BMR?+

They are closely related estimates of resting energy use. Testing protocols differ, but many planning calculators use the same predictive equation.

Does activity affect RMR?+

Activity does not change the resting calculation itself. The calculator shows a sedentary multiplier only for context.

Can I use RMR for weight loss planning?+

Use it as a starting estimate, then compare with real body-weight trend and professional guidance when health decisions matter.

How does the RMR Calculator calculate the result?+

For the RMR Calculator, it uses the RMR estimate: RMR = 10w + 6.25h - 5a + s. For women, s = -161. For men, s = +5. Weight is in kg, height is in cm, and age is in years.

What information do I need to use the RMR Calculator?+

For the RMR Calculator, enter age, sex, height, and weight. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the RMR Calculator?+

RMR Calculator is only as accurate as the age, sex, height, and weight entered. It applies the RMR estimate shown on this page, then rounds for readability. Treat the output as screening guidance rather than a diagnosis.

What should I check before using the RMR Calculator result?+

For the RMR Calculator, check age, sex, height, and weight, unit choices, and whether the calculator's assumptions fit the person being assessed. Use the result as screening or planning context, not as a diagnosis.

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Health guide

How to use the RMR Calculator

Estimate resting metabolic rate from age, sex, height, and weight with the Mifflin-St Jeor equation. The page also explains the RMR estimate and shows a practical example: For women, s = -161. For men, s = +5. Weight is in kg, height is in cm, and age is in years.

  1. 1

    Enter your details

    Enter age, sex, height, and weight, then complete any other fields shown in the calculator.

  2. 2

    Check the calculation

    Review the result alongside the RMR estimate: RMR = 10w + 6.25h - 5a + s.

  3. 3

    Compare scenarios

    Change one or more inputs to see how they affect the RMR Calculator result before you use the estimate.