Health & Fitness Calculators
BMI, calorie, body fat, and nutrition calculators for your wellness journey.
About Our Health & Fitness Calculators
These calculators give you useful starting points for understanding your body and nutrition. While they are not a substitute for professional medical advice, they use well-established formulas trusted by health professionals worldwide.
Frequently Asked Questions
How reliable is BMI as a health indicator?
BMI is a useful screening tool for general weight categories, but it does not measure body fat directly. Athletes with high muscle mass may have a high BMI despite being healthy. Consider it one data point alongside other measures like waist circumference and body fat percentage.
How many calories do I need per day?
Daily calorie needs depend on your age, sex, height, weight, and activity level. Our calorie calculator uses the Mifflin-St Jeor equation — one of the most accurate methods — to estimate your total daily energy expenditure.
What is a healthy body fat percentage?
Healthy ranges vary by age and sex. For men, 10 to 20 percent is generally considered healthy; for women, 18 to 28 percent. Our body fat calculator estimates your percentage so you can track changes over time.
Should I consult a doctor before using these calculators?
These tools provide estimates based on population-level formulas. For personal health decisions — especially related to diet, exercise programs, or medical conditions — always consult a qualified healthcare provider.