Historical Hamwi Weight Formula Calculator

The Historical Hamwi Weight Formula Calculator reproduces the Hamwi ideal-body-weight formula and frame-size multipliers as transparent arithmetic. Despite the route name, the result is not a healthy, ideal, or recommended body weight. The coefficients and frame multipliers are retained assumptions without support from the available authoritative sources.

Entries and assumptions

Choose centimeters or feet-and-inches for height, kilograms or pounds for the result, the male or female equation, and a small, medium, or large frame assumption. The controls default to centimeters, kilograms, the male equation, medium frame, 170 cm, and a stored feet-mode value of 5.7. In feet mode, digits after the decimal represent 0–11 inches, not a decimal fraction of a foot.

The historical base equations use height above 152.4 cm:

$\text{male base kg}=48+2.7\left(\frac{h-152.4}{2.54}\right)$

$\text{female base kg}=45.5+2.2\left(\frac{h-152.4}{2.54}\right)$

The selected frame assumption then creates a range:

Pound results use 2.20462 lb per kilogram.

Worked example

For the male equation at 170 cm, the base is:

$48+2.7\left(\frac{170-152.4}{2.54}\right)\approx66.71\text{ kg}$

The medium-frame assumption gives 66.71×0.95 through 66.71×1.05, shown as 63.4–70.0 kg. Entering 5.7 in feet mode represents 170.18 cm and gives 63.6–70.2 kg. That small difference comes from the height inputs, not a different equation.

Historical-formula checklist

• Label any saved result “historical Hamwi-derived range.”
• Keep the chosen sex equation and frame assumption with the number.
• Do not compare the range with actual weight as a health verdict.
• Use BMI for the separate weight-to-height screening task or waist-to-height ratio for a waist-based ratio.

Body composition, health history, and individual goals are not represented. The page is useful for reproducing the retained formula, not for choosing a target or making a clinical decision.

Keep the reference context

Record the height, unit selection, and other applicable inputs with the displayed range. Compare another measurement only after checking that the same reference context applies. The range is a result of the selected model and should remain distinguishable from an individualized clinical assessment or a personal target.