Calculators
BMR Calculator
Estimate basal metabolic rate with Mifflin–St Jeor and see rough daily calorie needs by activity level.
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Version 1.0.0 · Last reviewed
Tool
Result
Live output from your inputs
Enter values and calculate to see results.
How it worksShow guideHide guide
Introduction
Basal Metabolic Rate (BMR) estimates the calories your body burns at rest. This tool uses the Mifflin–St Jeor equation and shows rough daily calorie needs at common activity levels.
Disclaimer: This tool is for informational purposes only and is not professional medical, financial, or tax advice.
Formula
Mifflin–St Jeor estimates basal metabolic rate in kilocalories per day from weight (kg), height (cm), age (years), and sex.
- w — Weight in kilograms
- h — Height in centimeters
- a — Age in years
Step-by-step
- Enter weight in kilograms and height in centimeters.
- Enter age in years.
- Select the sex used by the Mifflin–St Jeor equation.
- Review BMR and activity-adjusted estimates.
Worked example
A 30-year-old male at 70 kg and 175 cm has a Mifflin–St Jeor BMR of about 1,665 kcal/day.
Use cases
- Get a resting calorie baseline
- Roughly estimate maintenance calories (TDEE)
- Pair with BMI for a fuller wellness picture
Frequently asked questions
Is this medical advice?
No. BMR and TDEE formulas are population estimates. Individual needs vary — consult a clinician for personalized guidance.
Why activity multipliers?
They approximate total daily energy expenditure (TDEE) from BMR. Choose the level closest to your typical week.
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