About Health Calculator
Health Calculator provides free, science-backed health calculators for BMI, calories, sleep cycles, macros, body fat, heart risk, nutrition planning, fitness metrics, hydration monitoring, and more. Our tools are developed using peer-reviewed research from the National Institutes of Health (NIH), Centers for Disease Control (CDC), and World Health Organization (WHO). Every calculator is reviewed by our medical advisory board consisting of board-certified physicians, registered dietitians, and exercise physiologists.
We are committed to the highest standards of accuracy, transparency, and user privacy. All calculations are performed locally on your device — we never store or share your health data. Our editorial process follows strict E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) guidelines to ensure every piece of content meets medical-grade publishing standards.
Published: January 25, 2026. Last updated: April 5, 2026. Written by the Health Calculator editorial team. Medical content reviewed by our advisory board of licensed healthcare professionals with expertise in internal medicine, nutrition science, exercise physiology, and preventive cardiology.