Health Calculators
BMI, calorie, TDEE, and BMR calculators for fitness and nutrition tracking.
Our health calculators help you understand your body metrics and set evidence-based nutrition targets. Using validated scientific formulas (Mifflin-St Jeor, WHO BMI classification), these tools estimate your energy needs, body composition category, and calorie targets for weight management. All formulas are sourced from peer-reviewed research published in NIH/PubMed, WHO guidelines, and CDC recommendations.
Frequently Asked Questions
Are these health calculators medically validated?
Our calculators use peer-reviewed formulas: Mifflin-St Jeor for BMR (validated against indirect calorimetry, published in American Journal of Clinical Nutrition), WHO BMI classification standards, and established activity multipliers. They are screening tools, not diagnostic instruments.
Should I use BMI, TDEE, or BMR calculator?
Use BMI for a quick weight classification check. Use BMR to understand your resting calorie burn. Use TDEE (which includes BMR) for actionable daily calorie targets based on your activity level. Use the Calorie Calculator for weight management goals with macro breakdown.
Can I use these for medical decisions?
No. These calculators provide general estimates and are not substitutes for professional medical advice. Consult a healthcare provider or registered dietitian for personalized health and nutrition guidance.
Why do my results differ from my fitness tracker?
Fitness trackers use different algorithms and may include real-time heart rate data. Our calculators use population-level equations which are accurate for most people within ±10%. Track your actual intake vs weight change over 2-3 weeks for your personal calibration.