BMR Calculator
Estimate your Basal Metabolic Rate with multiple formulas and options.
Disclaimer: For informational purposes only. Always consult a qualified healthcare provider for medical, fitness, or nutrition advice.
🔥 BMR Calculator – Find Out How Many Calories You Burn at Rest
Your Basal Metabolic Rate (BMR) is the number of calories your body burns each day just to keep you alive — powering essential functions like breathing, circulation, and cell repair. This free BMR Calculator gives you an accurate estimate using the most trusted formulas in nutrition science, so you can better plan your diet, fitness, and weight management goals.
đź“‹ Simple, Accurate Inputs
- Choose metric or imperial units for height and weight.
- Enter your age, sex, height, and weight.
- Optional body fat % input for advanced calculations.
- Formula selector: Mifflin–St Jeor, Harris–Benedict, Katch–McArdle, or compare all at once.
đź“Š Multiple Formula Options
- Mifflin–St Jeor – the most commonly used modern BMR formula.
- Harris–Benedict (Revised) – classic method with proven accuracy.
- Katch–McArdle – based on lean body mass, ideal if you know your body fat %.
- Show all formulas side-by-side for comparison.
⚡ Clear, Flexible Results
- BMR in kcal/day for your selected formula(s).
- Optional kilojoules/day toggle for Australian and New Zealand users.
- Copy your results instantly for tracking or sharing.
- Modern, mobile-friendly design for quick use anywhere.
đź“Ś Why Knowing Your BMR Matters
Once you know your BMR, you can estimate your Total Daily Energy Expenditure (TDEE) by factoring in activity levels — making it easier to set calorie targets for weight loss, muscle gain, or maintenance. This calculator is a perfect starting point for building a personalized nutrition plan.