Free Medical Tools & Health Calculators

Professional Medical Calculators — Clinically Accurate & Free

HoweHow's medical tool suite covers the most critical calculations in clinical practice, patient care, and health assessment. Every formula is validated against peer-reviewed sources, WHO guidelines, and established clinical scoring systems.

Body Metrics & Anthropometric Calculators

Our BMI calculator uses the WHO classification system with optional adjustments for age, sex, and ethnic background. The body fat percentage calculator applies the Jackson-Pollock and Navy methods. The waist-to-hip ratio tool and ideal body weight calculator use validated NIH reference ranges.

Clinical Scoring & Assessment Tools

The Glasgow Coma Scale, APGAR Score calculator, and pain scale assessment tool follow standardized protocols used globally in emergency and intensive care. Results include full interpretation guidelines and clinical notes.

Pharmacy & Dosage Calculators

The drug dosage calculator supports weight-based, age-based, and BSA-based dosing. The IV drip rate calculator, GFR estimation tool, and pediatric dose calculator include safety range alerts. For drug interactions see our Pharmaceuticals tools.