Ideal Weight Calculator

Each formula on its own page

This page runs the Devine formula. The other classic formulas — and the healthy BMI weight band — each have their own calculator with a worked example and a comparison:

• Robinson — A 1983 re-fit of Devine's constants — reads a little lighter than Devine at most heights.
• Miller — Also 1983, with the gentlest per-inch slope — the four formulas fan out most at the extremes of height.
• Hamwi — The 1964 original, and the heaviest of the four — 48 kg (men) / 45.5 kg (women) plus 2.7 / 2.2 kg per inch.
• Healthy BMI range — Not a single number — the whole weight band that lands in a BMI of 18.5–24.9 for your height.

How the formulas work

Both use the same shape: a base weight at 5 feet tall, plus a fixed amount per inch above that.

• Devine — men: 50 kg + 2.3 kg per inch over 5 ft
• Devine — women: 45.5 kg + 2.3 kg per inch over 5 ft
• Robinson — men: 52 kg + 1.9 kg per inch over 5 ft
• Robinson — women: 49 kg + 1.7 kg per inch over 5 ft

Below 5 feet the formulas are not defined, so this tool holds them at the base value and you should lean on the BMI range instead.

Worked example

A man 5 ft 10 in tall is 10 inches over 5 ft. Devine: 50 + 2.3 × 10 = 73 kg (161 lb). Robinson: 52 + 1.9 × 10 = 71 kg (156 lb). The healthy BMI range for that height is roughly 58–79 kg (129–174 lb) — so both formulas sit comfortably inside it, toward the middle.

Ideal weight by height (Devine)

Use it alongside other checks

These formulas are height-only. Pair the figure with your BMI, your body fat percentage, and your waist-to-height ratio (keep your waist under half your height) for a picture that accounts for muscle and fat distribution, not just the scale.