Ideal Weight Calculator

Knowing your ideal weight gives you a concrete, evidence-based target to work toward. Our Ideal Weight Calculator runs five different medical formulas simultaneously so you can see a range rather than a single rigid number — because no single formula fits every body type. Enter your height in feet/inches or centimeters, then select your biological sex. Click "Calculate" to see results from all five methods at once. The five formulas used: • Hamwi Formula (1964) — one of the first medical formulas, derived for clinical pharmacology dosing. Baseline: 48kg (women) or 52kg (men) for 5 feet, plus increments per inch above. • Devine Formula (1974) — widely used in medical settings for drug dosing calculations. Similar to Hamwi with slightly different increments. • Robinson Formula (1983) — derived from population data, considered one of the more accurate general-purpose estimates. • Miller Formula (1983) — tends to produce slightly higher ideal weight estimates, more suitable for athletic or muscular builds. • BMI Method (18.5–24.9 range) — calculates the weight range that produces a BMI between 18.5 and 24.9, the WHO-defined healthy BMI range. The results show you the ideal weight from each formula individually, plus a recommended target range (the average across all five, ±10%). This range acknowledges that ideal weight varies by body frame, muscle mass, age, and ethnicity — factors none of these formulas can fully capture. Important context: these formulas were developed for clinical drug dosing, not beauty standards. They represent weight ranges associated with reduced health risk, not a specific appearance. Athletes and heavily muscular individuals often fall above these ranges while being perfectly healthy. Use this alongside your doctor's guidance for the most meaningful interpretation.