Ideal weight calculator

All four take height in inches and add to a base weight for 60 inches (5 ft). The slope determines how fast the target grows with each extra inch.

• Hamwi (1964) — clinical rule of thumb. Male: 48 kg + 2.7 kg per inch above 60. Female: 45.5 + 2.2.
• Devine (1974) — most-cited in pharmacology dosing tables. Male: 50 + 2.3. Female: 45.5 + 2.3.
• Robinson (1983) — gentler slope. Male: 52 + 1.9. Female: 49 + 1.7.
• Miller (1983) — flatter still, US data. Male: 56.2 + 1.41. Female: 53.1 + 1.36.

For a 180 cm (5 ft 11 in) male the four come out at about 78, 75, 73, 72 kg — a 6 kg spread. The BMI 18.5–24.9 band for the same height is roughly 60–80 kg.

Hamwi was published in 1964 from observational hospital data; Devine was a pharmacology heuristic; Robinson and Miller were updates with more recent population samples. None of them account for body composition, frame size, ethnicity, age or training history. A 90 kg lifter at 12% body fat is not overweight regardless of what Hamwi says.

Use the BMI 18.5–24.9 range as the wide band and the four formulas as anchor points inside it. If you carry muscle, expect to land at the upper end and that's fine.

All four were derived for adults at or above 60 inches (5 ft). Below 60 inches each formula subtracts from the base — Devine female at 4 ft 10 in (147 cm) gives 40.9 kg, which is below the BMI 18.5 floor (40 kg). The BMI band is the more reliable reference at short heights.

WHO has flagged that BMI thresholds may need adjustment for some Asian populations, with overweight starting at 23 rather than 25. If that applies to you, treat the lower half of the band as the more relevant target.

When to reach for it. Use the range as a rough frame of reference for goal-setting conversations, not a single magic number to hit.

When something else is better. These formulas (Devine, Robinson, Hamwi) predate modern body-composition science and ignore frame size and muscle — don’t treat them as targets for athletes.

The pitfall to watch. The most common error is fixating on the midpoint. A healthy weight is a band, and where you sit within it depends on composition and health markers.

Everything runs on your device. The values you enter are processed locally in this browser tab — EpitomeTool does not send your input to a server, store it, or log it. That means you can use the tool offline once the page has loaded, and refreshing the tab wipes the slate.