BMR Calculator
Calculate your basal metabolic rate and daily calorie needs at rest using proven BMR formulas with this free calculator in your browser.
Enter details
Result
Fill in the fields to see your result.
Estimate only — not medical or nutritional advice. Individual needs vary; consult a professional before making big changes.
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter sex, age, height and weight.
- Pick a formula (Mifflin–St Jeor is recommended).
- Read your basal metabolic rate (BMR).
How it works
BMR is the energy your body uses at rest. Mifflin–St Jeor: 10·kg + 6.25·cm − 5·age + 5 (men) or − 161 (women). Harris–Benedict is also offered.
Worked example
Man, 80 kg, 180 cm, 30 y. Mifflin–St Jeor BMR = 1,780 kcal/day.
Tips
- Estimate only — not medical or nutritional advice. Individual needs vary.
Frequently asked questions
BMR vs TDEE?
BMR is at-rest energy; TDEE adds your activity. Use the TDEE calculator for maintenance calories.
Which formula?
Mifflin–St Jeor is generally the most accurate for most people.
Privacy?
Runs entirely in your browser. Your inputs are not saved or transmitted.
Related tools
- TDEE Calculator
- Calorie Deficit Calculator
- Macro Calculator
- BMI Calculator
- Ideal Body Weight Calculator
- Weight Change Timeline Calculator
Explore more in Health, Fitness, Nutrition & Body.
Cite this tool
Zerdly. (2026). BMR Calculator. Retrieved from https://www.zerdly.com/tools/bmr-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.