Health / Browser calculator

BMR Calculator

BMR Calculator works from the inputs you provide and returns estimated resting calories (kcal/day), estimated maintenance calories (kcal/day). Use the calculation panel to explore a scenario, then check the formula and limitations before applying the result.

Your inputs

Minimum: 1e-06 · Maximum: 1500
Minimum: 1e-06 · Maximum: 300
Minimum: 20 · Maximum: 120

Your results

Enter your values and calculate to see the result.

This calculator is for informational purposes only and is not a substitute for professional medical advice.

Formula and calculation method

Mifflin–St Jeor BMR = 10W + 6.25H − 5A + sex constant, with W in kg, H in cm and A in years. TDEE = BMR × selected activity multiplier.

Adult population estimate. Activity multipliers are broad assumptions, not a measured metabolic rate. Not intended for children, pregnancy, illness or restrictive weight-loss prescriptions.

How to use bmr calculator

  1. Set Measurement system by choosing the option that matches your calculation.
  2. Set Weight (kg or lb). The example below uses 70.
  3. Set Height (cm or inches). The example below uses 175.
  4. Set Age (years). The example below uses 30.
  5. Set Sex parameter used by equation by choosing the option that matches your calculation.
  6. Set Activity multiplier by choosing the option that matches your calculation.
  7. Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.

Worked example

Example inputs
Measurement system
Metric (kg, cm)
Weight (kg or lb)
70
Height (cm or inches)
175
Age (years)
30
Sex parameter used by equation
Male
Activity multiplier
Moderately active (1.55)
Estimated resting calories (kcal/day)
1,648.75
Estimated maintenance calories (kcal/day)
2,555.5625

Factors affecting your result

Adult population estimate. Activity multipliers are broad assumptions, not a measured metabolic rate. Not intended for children, pregnancy, illness or restrictive weight-loss prescriptions.

Changing measurement system changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.

Frequently asked questions

How does the bmr calculator work?

Mifflin–St Jeor BMR = 10W + 6.25H − 5A + sex constant, with W in kg, H in cm and A in years. TDEE = BMR × selected activity multiplier.

What inputs does BMR Calculator need?

Enter measurement system, weight (kg or lb), height (cm or inches), age (years), sex parameter used by equation, activity multiplier. Choose values that correspond to the same situation and measurement convention.

How should I interpret the bmr calculator result?

Adult population estimate. Activity multipliers are broad assumptions, not a measured metabolic rate. Not intended for children, pregnancy, illness or restrictive weight-loss prescriptions.

Are my bmr calculator inputs uploaded?

No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.

Method reference

Maintained by Calculators.buzz Editorial Team. Implementation date: . No professional credentials or clinical review are claimed. Read our methodology policy.