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Calorie Calculator

Use this calorie calculator to review an educational health calculation for calorie.

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

Calculator

Calorie Calculator

Calculates estimated maintenance calories 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.

More inputs3 additional assumptions

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

Choose kilograms or pounds.

Choose the broad activity factor used to multiply BMR.

Result

Result reflects the current submitted inputs.

  • Risk B
  • Reviewed 2026-05-26
  • 4 sources
Estimated maintenance calories2,907 kcal/day
Estimated BMR used1,876 kcal/day
Activity factor1.55
Activity level descriptionModerately active: moderate exercise or sports 3-5 days per week
Estimate noteAdult maintenance-calorie estimate only; not a diet prescription, medical advice, pregnancy plan, or clinical nutrition plan.

Breakdown

Weight used
90 kg
Height used
183 cm
Activity factor
1.55
  • 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.
  • Activity factors are broad approximations and do not model measured metabolism, body composition, pregnancy, lactation, clinical diets, medications, or medical conditions.
  • No calorie deficit, surplus, or weight-loss plan is generated.
  • No intermediate rounding is applied; display calorie outputs round to whole kcal/day.

Accuracy notes

Risk level
B
Reviewed
2026-05-26
Sources
4
Primary result
Estimated maintenance calories

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

Categories

What the result means

Estimated maintenance calories is the number to carry forward from this calorie calculation. Adult maintenance-energy 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 estimated BMR used, activity factor, and activity level description to explain why estimated maintenance calories moved when an input changed. Record the inputs you used and verify any health concern with a qualified professional.

Estimated maintenance caloriesAdult maintenance-energy estimate rounded to whole kcal/day for display.
Estimated BMR usedMifflin-St Jeor BMR before applying the activity factor.
Activity factorSelected activity multiplier.
Activity level descriptionHuman-readable selected activity level.

Use the result this way

  1. Start with Estimated maintenance calories, 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 Calorie Calculator when you need estimated maintenance calories, then use estimated bmr used and activity factor 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

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

Formula

Maintenance calories equal Mifflin-St Jeor BMR multiplied by a selected activity factor from 1.2 to 1.9. 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. Activity factors are broad approximations and do not model measured metabolism, body composition, pregnancy, lactation, clinical diets, medications, or medical conditions.

  • Maintenance calories equal Mifflin-St Jeor BMR multiplied by a selected activity factor from 1.2 to 1.9.
  • 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.
Activity levelChoose the broad activity factor used to multiply BMR.

Example

Using the default inputs, Calorie Calculator returns estimated maintenance calories of 2,907. Adjust age, sex used by equation, height, and height unit to match your own scenario.

FAQ

How is estimated maintenance calories calculated here?

Maintenance calories equal Mifflin-St Jeor BMR multiplied by a selected activity factor from 1.2 to 1.9. The first assumption to check is: This calculator is for adult educational estimates only and is not medical or nutrition advice.

What does Estimated maintenance calories mean for calorie?

Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Secondary values such as estimated BMR used, activity factor, and activity level description 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 maintenance calories?

Choose the published Mifflin-St Jeor coefficient used for the estimate. Changing it can alter estimated maintenance calories 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 calorie example show 2,907 for estimated maintenance calories?

The default inputs produce 2,907 for estimated maintenance calories. Treat that as a format and scale check, then replace every default value with your own inputs.

Can the calorie 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. BMR equation used before applying an activity factor.
    Scope
    Original Mifflin-St Jeor resting energy expenditure paper in healthy individuals aged 19-78.
    Supports
    BMR equation used before applying an activity factor.
  • 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 for the BMR component.
    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 for the BMR component.
  • Reviewed 2026-05-26 · Source not listed
    Calorie CalculatorNational Academy of Sports Medicine. Activity factors 1.2, 1.375, 1.55, 1.725, and 1.9 and maintenance-calorie style multiplication.
    Scope
    Fitness education resource that presents BMR x activity factor calorie estimates and common activity multipliers.
    Supports
    Activity factors 1.2, 1.375, 1.55, 1.725, and 1.9 and maintenance-calorie style multiplication.
  • Reviewed 2026-05-26 · Source not listed
    Body Weight PlannerNational Institute of Diabetes and Digestive and Kidney Diseases. Adult-only health disclaimer and exclusion of medical, pregnancy, and lactation use cases.
    Scope
    Adult body-weight planning tool that states adult-only, not-pregnant-or-breastfeeding, and not-medical-advice limitations.
    Supports
    Adult-only health disclaimer and exclusion of medical, pregnancy, and lactation use cases.

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.