BMR Calculator ⚡

Basal Metabolic Rate — calories your body burns at rest

Your Details 📋

Your BMR ⚡

Daily BMR (Mifflin-St Jeor)
1,648
calories per day at complete rest

📐 Compare Formulas

Mifflin-St Jeor (1990)Most accurate, recommended ⭐
1,648 cal
Harris-Benedict (1919)Original formula
1,696 cal
Revised Harris-Benedict (1984)Updated version
1,673 cal
Katch-McArdleUses body fat % (most accurate if known)
1,635 cal
💡 Tip: BMR is just resting calories. Multiply by activity factor (1.2-1.9) to get TDEE — your actual daily calorie needs.

📋 What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic functions while at complete rest — breathing, circulation, organ function, cell production, brain activity.

Roughly 60-75% of your daily calories go to BMR. The rest is from physical activity and digestion.

📐 The Formulas

Mifflin-St Jeor (1990) — Most Accurate ⭐

Men: BMR = 10 × kg + 6.25 × cm − 5 × age + 5

Women: BMR = 10 × kg + 6.25 × cm − 5 × age − 161

Harris-Benedict (1919) — Classic

Men: BMR = 66 + (13.7 × kg) + (5 × cm) − (6.8 × age)

Women: BMR = 655 + (9.6 × kg) + (1.8 × cm) − (4.7 × age)

Katch-McArdle — Body Fat Based

BMR = 370 + (21.6 × Lean Body Mass kg)

💡 What Affects BMR?

✅ Muscle mass: More muscle = higher BMR (muscle burns more calories than fat)

✅ Age: BMR decreases ~2% per decade after 20

✅ Gender: Men typically have higher BMR than women

✅ Genetics: Some people naturally have faster metabolism

✅ Body size: Larger bodies have higher BMR

⚠️ Disclaimer: BMR is an estimate. Actual values can vary ±10% based on individual metabolism, hormones, and health conditions.
⚠️

Important Medical Disclaimer

This calculator is for informational and educational purposes only. The results are estimates based on standard formulas and should NOT be used as a substitute for professional medical advice, diagnosis, or treatment.

  • 🩺 Always consult a qualified healthcare professional (doctor, registered dietitian, certified trainer) before making any decisions about your health, diet, exercise, pregnancy, or fitness routine.
  • ⚕️ Individual results may vary based on genetics, medical conditions, medications, age, lifestyle, and other personal factors not captured by this calculator.
  • 🚫 Do not rely solely on these calculations for treating, diagnosing, preventing, or managing any disease, medical condition, or pregnancy-related decision.
  • 🆘 In case of emergency or serious health concerns, contact your doctor immediately or call emergency services (Dial 112 in India).
  • 🤰 Pregnancy-related tools are estimates only — actual due dates and fertility windows must be confirmed by a gynecologist via ultrasound and medical examination.
  • 💊 If you have any medical condition (diabetes, heart disease, kidney issues, eating disorders, etc.), consult your doctor before using this tool's recommendations.

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