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Ideal Weight (Miller Formula) Calculator

See your ideal body weight with the Miller formula.

How it is calculated

Enter your height in centimetres and choose male or female. The tool converts the height above 5 feet (152.4 cm) into inches: inches over = (height − 152.4) ÷ 2.54. Then it applies the Miller formula. For men: IBW = 56.2 + 1.41 × inches over. For women: IBW = 53.1 + 1.36 × inches over. The result is in kilograms and is also shown in pounds (kg × 2.20462), both to two decimals. The formula is a straight line, so people shorter than 152.4 cm get a value below the base weight, and it keeps rising linearly for taller people. The tool does not look at age, frame size, muscle or body fat. Any choice other than female is treated as male.

Worked example

A man is 178 cm tall. Height over 5 feet: 178 − 152.4 = 25.6 cm, which is 25.6 ÷ 2.54 = 10.08 inches. Weight added: 1.41 × 10.08 = 14.21 kg. Ideal weight: 56.2 + 14.21 = 70.41 kg. In pounds this is 70.41 × 2.20462 = 155.23 lb. A woman of 165 cm would get 59.85 kg from the female line of the formula.

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Common mistakes

  • Entering height in inches or feet. The field is centimetres, so 70 (inches) would be read as a 70 cm person and give a meaningless number.
  • Leaving the sex on the default. Male is selected first, and the male line gives a higher weight than the female line at the same height.
  • Treating the result as a target everyone should reach. It is a statistical estimate, and a muscular or large-framed person can be healthy well above it.
  • Comparing it directly with results from Devine, Robinson or Hamwi. Each formula has different constants, so the same height gives different numbers.
  • Using it for children. The formula is built for adult height ranges, and it has no age input.

Sources

About this calculator

The Miller formula, published in 1983, is one of several equations doctors and dietitians use to estimate ideal body weight (IBW) from height and sex, refining earlier formulas like Devine and Robinson. It sets a base weight for 5 feet of height and adds a fixed amount for every inch above that: for men, IBW = 56.2 kg + 1.41 kg per inch over 5 feet; for women, IBW = 53.1 kg + 1.36 kg per inch over 5 feet.

Ideal-weight formulas like Miller's are widely used in clinical settings to guide medication dosing (where dosage is calculated per kilogram of ideal rather than actual body weight), to set nutritional targets, and as a quick reference point in fitness and weight-management contexts — with the understanding that they estimate a population average, not a personalized healthy weight for any one individual. Only height and sex are needed for the Miller formula, which gives an estimated ideal body weight.

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Comments (1)

  • Editorial team

    The Miller formula dates from the early 1980s and gives a single number from height and sex only, so treat it as a reference point and not a target. Other formulas such as Devine or Robinson give somewhat different values for the same person. It is a straight line meant for adults, so the tool only accepts heights from 120 to 250 cm. Which other formula would you like to see next to this one?

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