Devine Formula Calculator
The Devine formula (1974) — 50 kg (men) or 45.5 kg (women) at 5 ft, plus 2.3 kg per inch — is the clinical standard for drug dosing. 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 Devine Formula
The Devine formula (1974) is 50 kg (men) or 45.5 kg (women) at 5 ft, plus 2.3 kg per inch above that. For a 5 ft 10 in man that is 73.0 kg (161 lb). Enter your height above with Devine pre-selected as the primary formula.
How the Devine Calculation Works
Devine is deliberately simple: take the base weight for your sex — 50 kg for men, 45.5 kg for women — and add 2.3 kg (about 5 lb) for each inch of height above 5 ft. A 6-foot man is 12 inches over the base, so Devine gives 50 + (2.3 × 12) = 77.6 kg; a 5 ft 4 in woman is four inches over, giving 45.5 + (2.3 × 4) = 54.7 kg. Because the increment is the same for both sexes, the male and female curves stay a fixed 4.5 kg apart at every height. It is pure arithmetic from height and sex, with no input for weight, muscle or body fat — which is why the calculator also shows the healthy BMI range as a cross-check.
Devine Against the Other Formulas
Devine usually sits in the upper-middle of the four common equations. It runs a little above Robinson and Miller at taller heights and below Hamwi, so if you want a single clinical reference it is a reasonable pick — but the average of all four is a more balanced anchor. Because Devine reflects lean-tissue reference weight, it pairs naturally with a lean-mass view: estimate yours with the Lean Body Mass Calculator, and place the figure on the standard scale with the BMI Calculator. To compare Devine side by side with Robinson, Miller and Hamwi, use the full Ideal Weight Calculator.
Devine, B.J. (1974), 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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