Historical Hamwi Weight Formula Calculator

This page reproduces historical Hamwi-derived 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.