BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using scientifically proven formulas including Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle equations.
Required for Katch-McArdle formula (3-50%)
Mifflin-St Jeor Equation (Recommended)
Men: BMR = (10 × weight_kg) + (6.25 × height_cm) - (5 × age) + 5
Women: BMR = (10 × weight_kg) + (6.25 × height_cm) - (5 × age) - 161
Most accurate formula for general population, developed in 1990
Revised Harris-Benedict Equation
Men: BMR = 88.362 + (13.397 × weight_kg) + (4.799 × height_cm) - (5.677 × age)
Women: BMR = 447.593 + (9.247 × weight_kg) + (3.098 × height_cm) - (4.330 × age)
Revised version of the original 1919 formula, updated in 1984
Katch-McArdle Formula
BMR = 370 + (21.6 × lean_body_mass_kg)
Lean Body Mass = weight_kg × (1 - body_fat_percentage/100)
Most accurate for lean individuals who know their body fat percentage
Accuracy: BMR calculations are estimates based on population averages. Individual metabolic rates can vary by ±20% due to genetics, muscle mass, hormone levels, and other factors.
Medical Disclaimer: These calculations are for informational purposes only. Always consult with a healthcare professional or registered dietitian before making significant dietary changes, especially if you have medical conditions or are taking medications that may affect metabolism.
Understanding BMR:
- • BMR: Calories burned at complete rest for basic bodily functions
- • RMR (Resting Metabolic Rate): Similar to BMR but measured under less strict conditions
- • TDEE: BMR multiplied by activity level to get total daily calories
- • Factors affecting BMR: Age, gender, body composition, genetics, hormones, temperature