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Ideal Weight Calculator

Your ideal weight by Robinson, Devine, Hamwi and Miller formulas.

How it is calculated

The tool applies four published formulas that all start from a baseline weight at 60 inches (152.4 cm) and add a fixed amount for each inch above that: weight (kg) = baseline + per-inch × (height in inches − 60). For men the baselines and increments are Robinson 52 kg + 1.9, Devine 50 + 2.3, Hamwi 48 + 2.7 and Miller 56.2 + 1.41; for women Robinson 49 + 1.7, Devine 45.5 + 2.3, Hamwi 45.5 + 2.2 and Miller 53.1 + 1.36. Enter height in centimetres, which the tool converts to inches. It also shows a healthy BMI range, 18.5 to 24.9 × height² (m). The formulas disagree by a few kilograms and ignore age, build and muscle mass, so treat them as rough reference points.

Worked example

A man is 175 cm tall. In inches: 175 ÷ 2.54 = 68.90, which is 8.90 inches above 60. The Robinson (1983) formula gives 52 + 1.9 × 8.90 = 68.91 kg. Devine gives 50 + 2.3 × 8.90 = 70.46 kg, Hamwi 72.02 kg and Miller 68.75 kg. The BMI range uses 1.75 m: 18.5 × 1.75² = 56.66 kg up to 24.9 × 1.75² = 76.26 kg. All four formula results fall inside this healthy range.

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Common mistakes

  • Entering height in inches or feet. The field takes centimetres; 70 would be read as 70 cm.
  • Choosing the wrong sex. The baselines differ by several kilograms, so a mistake shifts every formula.
  • Treating one formula as the single right answer. The four disagree by a few kilograms; look at the spread and the BMI range together.
  • Applying the formulas to children or people with a lot of muscle. They were designed for typical adults and ignore build, age and body composition.
  • Using heights below 152 cm and expecting normal results. Below 60 inches the formulas subtract from the baseline, which is an extrapolation.

Sources

About this calculator

Where BMI produces a category from a height-to-weight ratio, this calculator applies four older reference formulas — Robinson, Devine, Hamwi and Miller — each estimating a target weight from height and sex, and shows a healthy-weight range derived from BMI alongside them. These formulas were originally created for specific clinical purposes such as medication dosing rather than as general fitness targets, so results are best treated as a rough reference point rather than a strict goal.

People use it out of curiosity when comparing their own weight to a commonly cited reference number, and it sometimes comes up in fitness planning discussions alongside other measures like BMI or body fat percentage, since no single number captures the full picture of a healthy body weight for an individual.

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Comments (1)

  • Editorial team

    All four formulas start from a baseline at 5 feet and add a fixed amount per inch, so for shorter adults the tool simply extends that line downward. For a 140 cm man it gives anything from about 35 kg (Hamwi) to about 49 kg (Miller), a wide spread. Treat the BMI range line as the more cautious reference there, and see a doctor for personal targets. Which of the four formulas does your clinic or sport use?

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