Simple, accurate, and free health tools for everyone.
HealthCalc was built with one goal: to give everyone access to reliable health metrics without any sign-ups, subscriptions, or ads. We believe understanding your body is the first step toward better health decisions.
BMI = weight (kg) / height² (m). Categorised as Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), and Obese (≥30) per WHO guidelines.
We use the Mifflin-St Jeor equation, widely considered the most accurate for the general population:
Men: 10 × weight + 6.25 × height − 5 × age + 5
Women: 10 × weight + 6.25 × height − 5 × age − 161
We use the U.S. Navy circumference method, which estimates body fat from neck, waist, and (for women) hip measurements relative to height.
We average three well-known formulas — Devine (1974), Robinson (1983), and Miller (1983) — to provide a balanced healthy-weight range.
The results provided by HealthCalc are for informational purposes only and do not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making changes to your diet, exercise, or health regimen.
We do not collect, store, or transmit any personal data. All calculations happen entirely in your browser — nothing is sent to a server.