Robinson Formula Calculator
The Robinson formula (1983) — 52 kg (men) or 49 kg (women) at 5 ft, plus 1.9 or 1.7 kg per inch — runs a few kilograms below Devine for tall men. It is pre-selected below; enter your height and sex.
Find Your Ideal Weight
Required: the ideal-weight formulas use biological sex (male or female) as a variable, so the estimate can’t be calculated without it.
Age adjusts the healthy BMI reference range for adults 65+ (senior guidelines use BMI 23–28).
Enter your height in centimeters (e.g., 170 cm)
Valid range: 152–214 cm (approx. 5 ft – 7 ft)
The ±10% frame adjustment is applied to all four formulas. Clinical medication dosing uses the unadjusted medium-frame value.
Women (>165 cm): Small <15.9 cm · Medium 15.9–16.5 cm · Large >16.5 cm
Valid range: 10–30 cm
Displays the average across all four major clinical formulas for a balanced target.
*This calculator is for informational purposes only. Please consult a healthcare professional before making any health decisions. See our medical disclaimer for more information.
Calculations are powered by the Devine, Robinson, Miller & Hamwi IBW Equations, four peer-reviewed clinical formulas for ideal body weight validated for adult assessment (Pai & Paloucek, Ann Pharmacother, 2000).
Quick Answer
The Robinson Formula
The Robinson formula (1983) is 52 kg (men) or 49 kg (women) at 5 ft, plus 1.9 kg or 1.7 kg per inch above that. For a 6-foot man that is 74.8 kg (165 lb) — a few kilograms below Devine. Enter your height above with Robinson pre-selected.
How the Robinson Calculation Works
Robinson takes the base weight for your sex — 52 kg for men, 49 kg for women — and adds a per-inch increment for every inch above 5 ft: 1.9 kg for men and 1.7 kg for women. A 5 ft 10 in man is 10 inches over, so Robinson gives 52 + (1.9 × 10) = 71.0 kg; a woman of the same height gives 49 + (1.7 × 10) = 66.0 kg. Robinson uses different increments for each sex, so the male and female curves are not a fixed distance apart the way Devine's are. It is height-and-sex arithmetic only — no weight or body-fat input — so the calculator pairs it with the healthy BMI range.
Robinson Against the Other Formulas
Robinson sits toward the conservative end for tall men, typically 2–4 kg under Devine and close to Miller. If you find Devine or Hamwi read a little high for your build, Robinson is often the figure that feels closer — but the average of all four remains the most balanced single anchor. To understand how much of your weight is lean tissue, estimate it with the Lean Body Mass Calculator, and to place a Robinson figure on the standard scale, the BMI Calculator shows the band for your height. See all four together in the Ideal Weight Calculator.
Robinson, J.D. et al. (1983), described in Pai & Paloucek, 2000. The formula is a population-based reference, not medical advice, and does not account for muscle mass or individual health conditions.
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