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Health & Fitness calculators

BMR Calculator

Estimate adult basal metabolic rate using the Mifflin-St Jeor equation. The result is a formula-based estimate of resting energy use, not a measured metabolic test or nutrition advice.

Adult BMR inputs

Adult BMR inputs

Mifflin-St Jeor uses age, equation group, height and weight.

Units

Changes labels and units only.

years

Adult range: 18 to 100.

Mifflin-St Jeor has male and female equation constants.

ft

Feet part of height.

in

Inches part, below 12.

lb

Adult range: 50 to 1000 lb.

Result updated. Estimated BMR: 1,696 kcal/day.

Result summary

Estimated BMR

Main health estimate from the values entered.

Formula estimate

1,696 kcal/day

This is a resting-energy estimate from a predictive equation, not a measured metabolic test.

Key numbers

Formula used
Mifflin-St Jeor
Equation group
Male equation group

General estimate notice

This tool provides a general resting-energy estimate only. It is not medical advice, not a diagnosis and not a substitute for a qualified health professional. Do not use it for emergency decisions. It is not a measured metabolic test and not nutrition guidance.

Key takeaway

Your estimated BMR is about 1,696 kcal/day using the Mifflin-St Jeor equation. This is a resting-energy estimate, not a measured metabolic test.

Formula used
Mifflin-St Jeor
Equation group
Male equation group
Height used
5 ft 9 in
Weight used
170 lb

Notes to keep in mind

  • BMR estimates vary by body composition, health status, measurement accuracy and formula limits.
  • This calculator does not estimate daily maintenance calories unless activity is added in a separate calorie calculator.
  • BMR formulas estimate resting energy and do not prescribe what anyone should eat.

Copy this BMR estimate

Copy a plain-English summary with the formula, entered assumptions and estimate limitation.

Exports are generated in your browser. NoNoiseTools does not need to store your numbers or require an account.

Mifflin-St Jeor formula

The equation uses weight in kilograms, height in centimeters, age in years and the selected equation constant. It estimates resting energy use only and does not prescribe calorie intake.

How this BMR calculator works

The calculator converts height and weight to metric units, then applies the Mifflin-St Jeor equation using age and the selected equation constant.

BMR vs daily calorie needs

BMR estimates resting energy use before activity is added. Daily maintenance estimates require an activity assumption and are handled separately by the Calorie Calculator.

What this tool does not include

This is not a measured metabolic test, nutrition plan, medical diagnosis or calorie prescription. It does not model medical conditions, body composition differences or pregnancy.

Key terms and assumptionsFormula notes, key terms, source assumptions and limits used in this calculator.
Predictive equation
The result uses the Mifflin-St Jeor equation and is not a measured metabolic test.
Adult scope
This calculator is scoped to adults age 18 to 100 using the height and weight ranges supported by the health tools.
Equation constants
The equation uses separate male and female constants. The selected value is the equation group used, not broader identity guidance.
No calorie prescription
BMR estimates resting energy only. It does not prescribe calorie intake, diets, weight loss or treatment.

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FAQs

What is BMR?

BMR is an estimate of energy used at rest before activity is added.

Which formula does this calculator use?

This calculator uses the Mifflin-St Jeor equation.

Is BMR the same as maintenance calories?

No. Maintenance calories estimate total daily energy use and require an activity assumption.

Is this a measured metabolic rate?

No. It is a predictive equation, not an indirect calorimetry test.

Can teenagers use this calculator?

No. This calculator is scoped to adults.

Why does the formula ask for a sex constant?

The Mifflin-St Jeor equation has separate male and female equation constants. The tool labels this as the equation group used.

Can medical conditions affect BMR?

Yes. This calculator does not model medical conditions. Personal questions should go to a qualified professional.

Can I copy my result?

Yes. The copy summary includes the formula and entered assumptions.