BMR Calculator

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Find your basal metabolic rate — the calories your body burns at complete rest.

Inputs

Sex

Age (years)

Weight (kg)

Height (cm)

How to use this calculator: BMR Calculator

Find your basal metabolic rate — the calories your body burns at complete rest. The example below is calculated by this page's real engine from the displayed inputs.

1Confirm that the BMR Calculator matches the quantity or design check you need.
2Enter Age, Weight, and Height using the units printed beside each field.
3Select the applicable Sex options; these choices change the calculation method or factors.
4Calculate, then follow the substituted equations in the worked example and compare the result with any stated limit.
5Read the assumptions, warnings and cited references before using the result for a financial, medical or engineering decision.

Input guide and example values

Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.

Input	Example value	Why it matters
Sex	Male	Select the option that matches the real installation or scenario.
Age	30 years	Measured or known age used by the calculation engine.
Weight	70 kg	Measured or known weight used by the calculation engine.
Height	172 cm	Measured or known height used by the calculation engine.

Formula inputs & variables for BMR Calculator

These are the named quantities used by this calculator. When the source formula does not define a mathematical symbol, OneCalcApp keeps the real input label instead of inventing one.

Variable / input	Unit	Meaning in this calculation
Sex	—	Select the option that matches the real installation or scenario.
Age	years	Measured or known age used by the calculation engine.
Weight	kg	Measured or known weight used by the calculation engine.
Height	cm	Measured or known height used by the calculation engine.

How the BMR Calculator works

The BMR Calculator uses Sex, Age, Weight, and Height to calculate BMR, Sedentary needs, and Moderately active needs. Its engine applies Men: BMR = 10w + 6.25h − 5a + 5; the worked values below come from that same live calculation rather than a separately typed example.

With Sex Male, Age 30 years, Weight 70 kg, and Height 172 cm, the main worked-example result is BMR = 1,630 kcal/day.

How each BMR Calculator input is used

Sex

The BMR Calculator worked example selects “Male”. Available choices include Male and Female. This selection may change the method or factor used by the engine, so choose the option that matches the real case.

Age

The BMR Calculator worked example uses Age = 30 years. This value is passed directly into the calculation, with an allowed minimum 5 and maximum 100.

Weight

The BMR Calculator worked example uses Weight = 70 kg. This value is passed directly into the calculation, with an allowed minimum 0.

Height

The BMR Calculator worked example uses Height = 172 cm. This value is passed directly into the calculation, with an allowed minimum 0.

BMR Calculator formulas and result interpretation

Formula 1: relationship used

In the BMR Calculator, Men: BMR = 10w + 6.25h − 5a + 5. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

Formula 2: relationship used

In the BMR Calculator, Women: BMR = 10w + 6.25h − 5a − 161. The quantities in this relationship come from the named inputs or from an earlier calculation step shown in the worked example.

BMR

For the displayed BMR Calculator worked example, BMR is 1,630 kcal/day. Verify Sex, Age, and Weight and their units before relying on this output.

Sedentary needs

For the displayed BMR Calculator worked example, Sedentary needs is 1,956 kcal/day. Verify Sex, Age, and Weight and their units before relying on this output.

Moderately active needs

For the displayed BMR Calculator worked example, Moderately active needs is 2,527 kcal/day. Verify Sex, Age, and Weight and their units before relying on this output.

BMR Calculator accuracy, checks and limitations

BMR Calculator units check: confirm Sex, Age (years), Weight (kg), and Height (cm) before calculating.
BMR Calculator result check: compare BMR, Sedentary needs, and Moderately active needs with the substituted formula steps and the displayed rounding precision.
BMR Calculator: This is a general estimate, not a diagnosis or personal medical advice. Discuss health decisions with a qualified clinician.

Formula, derivation and worked example

The Mifflin–St Jeor equation estimates the energy your body needs just to keep the heart, brain and organs running for 24 hours. It is the base number every diet plan starts from — your daily needs are BMR multiplied by an activity factor.

Men: BMR = 10w + 6.25h − 5a + 5

Women: BMR = 10w + 6.25h − 5a − 161

Substitution steps

1. Mifflin–St Jeor
10w + 6.25h − 5a ± c
= 1,630 kcal

Computed example results

BMR: 1,630 kcal/day
Sedentary needs: 1,956 kcal/day
Moderately active needs: 2,527 kcal/day

Understanding the result

Read the main result together with supporting checks, assumptions, limits and intermediate values.

For a manual check, repeat the first equation, confirm the units and change one input at a time.

Assumptions and calculation scope

Age is assumed to be entered in years; converting from another unit before entry avoids changing the numerical meaning of the calculation.
Sex is assumed to match the real case. Choosing a different available option can change the method, factor or interpretation used by this calculator.
BMR Calculator applies the displayed Men: BMR = 10w + 6.25h − 5a + 5 relationship to the entered health inputs. Factors that are not exposed as inputs or stated assumptions are outside this calculator's calculation scope.

Common mistakes when using BMR Calculator

Do not mix units for Age (years), Weight (kg), Height (cm). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
Do not leave Sex on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
Do not replace the displayed Men: BMR = 10w + 6.25h − 5a + 5 relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
Do not treat BMR = 1,630 kcal/day from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.

When the BMR Calculator is useful

BMR Calculator is designed for cases where Sex, Age, Weight, Height are known and you need BMR, Sedentary needs, Moderately active needs. The page keeps the live calculator, calculation method and worked example together so the result can be checked instead of treated as a black-box number.

Use the calculator for the scope described by its inputs and notes. The displayed method is Men: BMR = 10w + 6.25h − 5a + 5. If the real project or decision needs factors that are not represented here, treat the result as an estimate and add the missing checks separately.

Sex and Age: what changes the answer

The worked example uses Sex = Male, Age = 30 years, Weight = 70 kg, Height = 172 cm. With those values, BMR is 1,630 kcal/day. Changing an input should be interpreted according to that field's unit, range, option and hint rather than by the number alone.

For this calculator, the main input roles are: Sex: Select the option that matches the real installation or scenario. Available choices include Male, Female. Age (years): Measured or known age used by the calculation engine. Weight (kg): Measured or known weight used by the calculation engine. Height (cm): Measured or known height used by the calculation engine.

How to sanity-check a BMR Calculator result

Start by confirming the entered values and units, then compare the substituted working with the displayed formula or calculation steps. Pay particular attention to BMR, because it is the first worked-example output shown by the live engine.

Finally, compare the result with the assumptions, warnings and related calculators on this page. A nearby calculator can be useful as a cross-check when it measures the same workflow from a different input or output direction.

Next logical calculator

Continue with TDEE Calculator

Useful next check because both tools use Sex and Age, while TDEE Calculator answers a different part of the same workflow.

Open TDEE Calculator

Formula

Men: BMR = 10w + 6.25h − 5a + 5
Women: BMR = 10w + 6.25h − 5a − 161

Frequently asked questions

What inputs does the BMR Calculator use?

It uses Sex, Age, Weight, and Height. Follow the unit printed for each field and choose any selectable option to match the real scenario.

What does the BMR Calculator calculate?

It calculates BMR, Sedentary needs, and Moderately active needs. With the displayed default inputs, BMR is 1,630 kcal/day.

Which formula does the BMR Calculator use?

The primary relationship is Men: BMR = 10w + 6.25h − 5a + 5. The page also shows substituted values and calculation steps so the result can be checked independently.

How can I verify a BMR Calculator result?

First verify the units for Sex, Age, and Weight. Then compare the substituted formula steps with BMR and its displayed precision.

What are the limitations of the BMR Calculator?

BMR Calculator: This is a general estimate, not a diagnosis or personal medical advice. Discuss health decisions with a qualified clinician.

Where can I find related Health tools?

Use the related-tools section on this page to compare another method, change units or continue the same health calculation.

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