Calculate Your BMR

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest to maintain basic physiological functions like breathing, circulation, cell production, and organ function. Understanding your BMR through our BMR calculator is crucial for effective weight management, fitness planning, and nutrition guidance. Your BMR represents approximately 60-70% of your total daily calorie expenditure, making it the foundation for all metabolic calculations and dietary planning.

Our BMR calculator uses scientifically proven formulas including the Mifflin-St Jeor equation (most accurate for general population), Harris-Benedict equation (traditional method), and Katch-McArdle formula (best when body fat is known). Clinical studies show our primary formula achieves approximately 90% accuracy for healthy adults, making our BMR calculator more reliable than those using outdated methods. While no BMR calculator can be 100% perfect due to individual metabolic variations, our calculator provides the most scientifically-backed estimates available.

To use our BMR calculator, you need to provide your age, gender, height (in cm), and weight (in kg). These factors directly impact your Basal Metabolic Rate calculation. For enhanced accuracy, you can also provide your body fat percentage if known, which allows our BMR calculator to use the more precise Katch-McArdle formula. The more accurate your input information, the more precise your BMR calculation will be.

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest to maintain basic physiological functions, while TDEE (Total Daily Energy Expenditure) includes your BMR plus additional calories burned through physical activity, exercise, and daily movements. Our BMR calculator shows your baseline calorie needs, which serves as the foundation for calculating your total daily calorie requirements. Understanding both values helps you make informed decisions about diet and exercise planning.

We recommend recalculating your BMR using our BMR calculator every 2-4 weeks during active fitness programs, or whenever significant changes occur in your weight (5+ pounds), body composition, or age. As you lose or gain weight, your BMR changes accordingly, which affects your daily calorie needs. Regular BMR recalculation ensures your calorie targets remain accurate for continued progress toward your fitness goals.

Yes, our BMR calculator provides the foundation for both weight loss and muscle gain planning. For weight loss, you typically need to consume fewer calories than your BMR plus activity calories. For muscle gain, you generally need to consume more calories than your total daily expenditure. However, these are general guidelines only, and individual needs vary significantly. We recommend consulting with healthcare professionals or registered dietitians for personalized advice, especially if you have underlying health conditions.

Our BMR calculator primarily uses the Mifflin-St Jeor equation, which research shows is the most accurate formula for the general population with approximately 90% accuracy. When you provide body fat percentage, our BMR calculator automatically switches to the Katch-McArdle formula, which is more accurate for individuals with known body composition. The Harris-Benedict equation is also available but is considered less accurate for modern populations.

Age significantly impacts your BMR calculation because metabolic rate typically decreases with age due to factors like muscle mass loss, hormonal changes, and reduced organ function. Our BMR calculator accounts for these age-related changes in its formulas. Generally, BMR decreases by about 1-2% per decade after age 30, which is why regular recalculation with our BMR calculator is important for maintaining accurate calorie targets.

Yes, we take your privacy very seriously. All BMR calculations are performed locally on your device using client-side processing - your personal information (age, weight, height, gender) never leaves your device or gets transmitted to our servers. We do not collect, store, or share any personal health data. Our BMR calculator ensures complete privacy and security of your information while providing accurate results.