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BMR Calculator

Use this BMR calculator to review an educational health calculation for BMR. The page returns estimated BMR plus supporting values for equation used and estimate note; check the assumptions before reusing the result.

Primary answer
Estimated BMR
Inputs to verify
Age, Sex used by equation, and Height
Use type
Use as an estimate that depends on assumptions.
Keyword intent
BMR calculator

Calculator

BMR Calculator

Calculates estimated bmr from age, sex used by equation, height. Defaults are filled in so you can review a working example before changing inputs.

years

Adult Mifflin-St Jeor estimate; this packet stays within the original 19-78 year study range.

Choose the published Mifflin-St Jeor coefficient used for the estimate.

Use centimeters when height unit is cm, or total inches when height unit is in.

Choose centimeters or inches.

Use kilograms when weight unit is kg, or pounds when weight unit is lb.

Choose kilograms or pounds.

Result

Result reflects the current submitted inputs.

  • Risk B
  • Reviewed 2026-05-26
  • 3 sources
Estimated BMR1,876 kcal/day
Equation usedMifflin-St Jeor: 9.99*kg + 6.25*cm - 4.92*age + sex coefficient
Estimate noteAdult educational estimate only; excludes children, pregnancy, clinical nutrition, and individual medical conditions.

Breakdown

Weight used
90 kg
Height used
183 cm
Sex coefficient
male
  • This calculator is for adult educational estimates only and is not medical or nutrition advice.
  • The accepted age range is 19-78 years to stay within the original Mifflin-St Jeor adult study range.
  • The equation uses binary male/female coefficients; it does not model pregnancy, lactation, children, clinical diets, body composition, medications, or medical conditions.
  • Metric and imperial inputs are normalized before calculation.
  • No intermediate rounding is applied; display output rounds to whole kcal/day.

Accuracy notes

Risk level
B
Reviewed
2026-05-26
Sources
3
Primary result
Estimated BMR

Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.

Categories

What the result means

Estimated BMR is the number to carry forward from this BMR calculation. Mifflin-St Jeor basal metabolic rate estimate rounded to whole kcal/day for display. Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Use equation used and estimate note to explain why estimated BMR moved when an input changed. Record the inputs you used and verify any health concern with a qualified professional.

Estimated BMRMifflin-St Jeor basal metabolic rate estimate rounded to whole kcal/day for display.
Equation usedFormula label shown with the result.
Estimate noteVisible adult-use limitation and nutrition disclaimer.

Use the result this way

  1. Start with Estimated BMR, then use supporting outputs only to explain the primary answer.
  2. Verify age, sex used by equation, and height before copying the result.
  3. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.
  4. Record the inputs you used and verify any health concern with a qualified professional.

User job

How to use this calculator

Use BMR Calculator when you need estimated bmr, then use equation used and estimate note to check the context for general wellness education and preparing for a professional conversation.

Best for

  • Understanding a formula-based estimate
  • Seeing which inputs drive a health-related output
  • Reviewing a default example before entering your own age and sex used by equation.

Check before relying

  • Health formulas can be population-specific; do not use the result as diagnosis or treatment advice.
  • This calculator is for adult educational estimates only and is not medical or nutrition advice.
  • The accepted age range is 19-78 years to stay within the original Mifflin-St Jeor adult study range.
  • Source context: American Journal of Clinical Nutrition / PubMed, reviewed 2026-05-26.

Next useful step

  • Calorie CalculatorUse next when the body metric task needs estimated maintenance calories instead of estimated BMR.
  • TDEE CalculatorUse next when the body metric task needs estimated TDEE instead of estimated BMR.
  • Body Fat CalculatorUse next when the body metric task needs estimated body fat instead of estimated BMR.

Formula

BMR uses the Mifflin-St Jeor equation after normalizing weight to kilograms and height to centimeters. Key assumptions: This calculator is for adult educational estimates only and is not medical or nutrition advice. The accepted age range is 19-78 years to stay within the original Mifflin-St Jeor adult study range. The equation uses binary male/female coefficients; it does not model pregnancy, lactation, children, clinical diets, body composition, medications, or medical conditions.

  • BMR uses the Mifflin-St Jeor equation after normalizing weight to kilograms and height to centimeters.
  • This calculator is for adult educational estimates only and is not medical or nutrition advice.
  • The accepted age range is 19-78 years to stay within the original Mifflin-St Jeor adult study range.
  • Primary source context: American Journal of Clinical Nutrition / PubMed.

Inputs

Enter age, sex used by equation, height, and height unit for general wellness education and preparation for a professional conversation. Before calculating, choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges. Age: Adult Mifflin-St Jeor estimate; this packet stays within the original 19-78 year study range. Sex used by equation: Choose the published Mifflin-St Jeor coefficient used for the estimate. Height: Use centimeters when height unit is cm, or total inches when height unit is in. Height unit: Choose centimeters or inches.

AgeAdult Mifflin-St Jeor estimate; this packet stays within the original 19-78 year study range.
Sex used by equationChoose the published Mifflin-St Jeor coefficient used for the estimate.
HeightUse centimeters when height unit is cm, or total inches when height unit is in.
Height unitChoose centimeters or inches.
WeightUse kilograms when weight unit is kg, or pounds when weight unit is lb.
Weight unitChoose kilograms or pounds.

Example

Using the default inputs, BMR Calculator returns estimated BMR of 1,876. Adjust age, sex used by equation, height, and height unit to match your own scenario.

FAQ

How is estimated BMR calculated here?

BMR uses the Mifflin-St Jeor equation after normalizing weight to kilograms and height to centimeters. The first assumption to check is: This calculator is for adult educational estimates only and is not medical or nutrition advice.

What does Estimated BMR mean for BMR?

Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Secondary values such as equation used and estimate note are there to explain the primary answer, not to replace it.

What should I enter for Age?

Adult Mifflin-St Jeor estimate; this packet stays within the original 19-78 year study range. Use years for this field. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.

How does Sex used by equation change estimated BMR?

Choose the published Mifflin-St Jeor coefficient used for the estimate. Changing it can alter estimated BMR because the formula uses the submitted inputs together. Also compare measurement method, formula population, age range, units, sex or activity assumptions, and clinical context.

Why does the BMR example show 1,876 for estimated BMR?

The default inputs produce 1,876 for estimated BMR. Treat that as a format and scale check, then replace every default value with your own inputs.

Can the BMR result diagnose or prescribe anything?

No. Use it as educational context only. Health formulas can depend on population, measurement method, age range, and clinical context.

Sources

Last reviewed: 2026-05-26

  • Reviewed 2026-05-26 · Source 1990-02
    A new predictive equation for resting energy expenditure in healthy individualsAmerican Journal of Clinical Nutrition / PubMed. Choice of Mifflin-St Jeor equation and conservative age scope for adult educational BMR estimates.
    Scope
    Original Mifflin-St Jeor resting energy expenditure paper in healthy individuals aged 19-78.
    Supports
    Choice of Mifflin-St Jeor equation and conservative age scope for adult educational BMR estimates.
  • Reviewed 2026-05-26 · Source 2016
    Estimating Resting Metabolic RateNCBI Bookshelf / Endotext. Implemented 9.99 weight coefficient, 6.25 height coefficient, 4.92 age coefficient, sex constants, and required input units.
    Scope
    Clinical reference table listing the Mifflin-St Jeor equation with kilograms, centimeters, age, and sex-specific constants.
    Supports
    Implemented 9.99 weight coefficient, 6.25 height coefficient, 4.92 age coefficient, sex constants, and required input units.
  • Reviewed 2026-05-26 · Source 2012-10
    Resting Metabolic Rate: Best Ways to Measure It and Raise It, TooAmerican Council on Exercise. Secondary confirmation of implemented Mifflin-St Jeor coefficients and estimate limitations.
    Scope
    Fitness education article showing Mifflin-St Jeor equation coefficients and explaining that formula estimates can vary materially.
    Supports
    Secondary confirmation of implemented Mifflin-St Jeor coefficients and estimate limitations.

Disclaimer

This health calculator is for educational body-metric estimates only. It does not diagnose, prescribe diet or treatment, or replace individualized advice from a qualified health professional.