Ideal Weight Calculator
Find a healthy target weight range for your height and sex.
Results update as you type.
About this calculator
An ideal weight calculator gives a target weight for your height and sex using several well-known clinical formulas — Devine, Robinson, Miller and Hamwi — alongside the healthy-BMI range. Each formula starts from a base weight at five feet of height and adds a set amount for every inch above that, differing slightly for men and women. Showing them together gives a sensible range rather than a single false-precision number.
For example, a man 175 cm (about 5 ft 9 in) tall is roughly 9 inches over five feet, so the Devine formula gives 50 + 2.3 × 9 ≈ 70.5 kg, with the other formulas landing within a couple of kilograms. The healthy-BMI band for that height spans about 57 to 76 kg, which comfortably contains those estimates.
Use it as a starting reference for a weight goal, but remember these formulas ignore muscle mass and body composition, so a muscular or very lean person may sit outside the figure while being perfectly healthy. Treat the range as a guide, not a target to hit exactly.
Frequently asked questions
Which ideal weight formula is best?
They mostly agree within a few kilograms. The Devine formula is the most widely used clinically, but a healthy BMI range (18.5-24.9) is a more modern guide.
Is ideal weight the same as a goal weight?
Not necessarily. These formulas ignore muscle mass and body composition, so an athletic person may sit above their ideal figure while being perfectly healthy.
How is the Devine formula calculated?
For men it is 50 kg plus 2.3 kg for every inch over 5 feet; for women it is 45.5 kg plus 2.3 kg per inch over 5 feet. So a man 5 ft 9 in tall is 50 + 2.3 × 9 ≈ 70.5 kg.
Why do the formulas give different numbers?
Devine, Robinson, Miller and Hamwi were each derived from different data and use slightly different base weights and per-inch increments. They usually agree within a few kilograms, which is why the calculator shows them together as a range.
Does ideal weight depend on age or frame size?
These classic formulas use only height and sex, so they do not adjust for age, frame size or muscularity. The healthy-BMI range is a more modern guide, and a larger frame naturally sits toward the top of any range.
What weight range corresponds to a healthy BMI?
It is the weight span that keeps your BMI between 18.5 and 24.9 for your height. For 175 cm that works out to roughly 57 kg to 76 kg. The calculator derives this band from your height and shows it beside the Devine, Robinson, Miller and Hamwi estimates.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/ideal-weight/curl
curl "https://calculator.free/api/v1/ideal-weight/?sex=male&units=metric&height=175"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/ideal-weight/?" + new URLSearchParams({
"sex": "male",
"units": "metric",
"height": "175"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.