# Ideal Weight Calculator — Devine, Robinson, Miller & Hamwi > Find your ideal body weight from four classic formulas plus the healthy BMI range for your height. Metric or imperial, instant, free, no sign-up. - **Category:** Health & Body - **Interactive calculator:** https://youcalc.com/en/health-body/ideal-weight/ - **Price:** Free, no sign-up required ## Overview This calculator gives you a range of ideal body weight estimates for your height and sex, drawn from four widely cited clinical formulas, alongside the healthy weight range derived from a BMI of 18.5–24.9. Use it as an informational starting point — not a medical target — when thinking about your weight relative to your height. ## How to read your result The result shows a spread of estimates from Devine, Robinson, Miller, and Hamwi rather than one definitive number. Each formula was developed in a different clinical context and arrives at a slightly different figure; the range reflects that honest disagreement. The healthy BMI range (18.5–24.9) is also shown as a complementary reference. None of these figures account for body composition, muscle mass, age, or individual build — an athlete may legitimately sit above the formula estimates while still being healthy. ## Method The calculator applies four formulas, each expressed as a base weight plus a fixed increment per inch of height above 5 ft (152 cm). Devine (1974): men 50 + 2.3 × h kg, women 45.5 + 2.3 × h kg. Robinson (1983): men 52 + 1.9 × h kg, women 49 + 1.7 × h kg. Miller (1983): men 56.2 + 1.41 × h kg, women 53.1 + 1.36 × h kg. Hamwi (1964): men 48 + 2.7 × h kg, women 45.5 + 2.2 × h kg. Here h is inches above 60 (i.e. height in inches minus 60). The healthy weight range is computed from BMI 18.5–24.9 as weight = BMI × (height in metres)². ## Example - **Setup:** A woman aged 30, height 165 cm (5 ft 5 in), enters her details without entering a current weight. - **Result:** The four formula estimates fall between 56.4 kg and 59.8 kg (Hamwi: 56.4, Devine: 56.9, Robinson: 57.4, Miller: 59.8). The healthy BMI range for 165 cm is 50.4–67.8 kg. All four estimates sit within that range. ## Frequently asked questions ### Which formula estimate is the most accurate? No single formula is universally best. Devine (1974) was designed for drug dosing in adults, Robinson and Miller (both 1983) were refinements for clinical settings, and Hamwi (1964) is a simple rule of thumb. Each can differ by several kilograms for the same person. Treat the range as a ballpark, not a precision target. ### Why do these formulas use height over 5 ft (152 cm)? All four formulas were developed when height was measured in feet and inches in clinical practice. They each start with a base weight for a person exactly 5 ft tall, then add or subtract a fixed amount per inch above or below that reference point. The calculator converts your height to inches internally before applying each formula. ### Should I aim to reach one of these estimates? These are historical reference figures, not personal prescriptions. Body weight goals should be discussed with a qualified healthcare provider who can consider your full health picture, including body composition, activity level, and medical history. ### What if my current weight falls outside the healthy BMI range? The calculator shows a signed difference (delta) between your current weight and the nearest edge of the healthy BMI range. A positive delta means you are above the range; a negative delta means you are below. This is informational only — the BMI range itself does not capture muscle mass, bone density, or other factors that a clinician would weigh up. ### Do the formulas differ for men and women? Yes. Every formula uses a different base weight and a different per-inch adjustment for men versus women, reflecting average differences in body composition. The calculator applies the correct set of coefficients based on the sex you select. ## Related calculators - [BMI Calculator](https://youcalc.com/en/health-body/bmi/) - [Body Fat Calculator](https://youcalc.com/en/health-body/body-fat/) - [BMR Calculator](https://youcalc.com/en/health-body/bmr/) - [Calorie Calculator](https://youcalc.com/en/health-body/calorie/) ## Sources - https://clincalc.com/kinetics/idealbw.aspx - https://www.cdc.gov/bmi/adult-calculator/ --- Interactive version: https://youcalc.com/en/health-body/ideal-weight/ · From YouCalc — https://youcalc.com