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Ideal Weight Calculator

Estimate a healthy target weight for your height and sex using four established formulas, plus the healthy range implied by BMI. These are guidelines — your ideal weight also depends on build, muscle and overall health.

About you

Estimated ideal weight
73 kg

  • Robinson (1983)
  • Miller (1983)
  • Devine (1974)
  • Hamwi (1964)
  • Healthy BMI range
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How it works

The classic ideal-body-weight formulas all start from a base weight at 5 feet (60 inches) tall and add a fixed amount per inch above that. For example, the Devine formula:

Men: 50 kg + 2.3 kg × (inches over 5 ft)
Women: 45.5 kg + 2.3 kg × (inches over 5 ft)

The Robinson, Miller and Hamwi formulas use the same shape with slightly different constants. We also show the weight range for a healthy BMI of 18.5–24.9.

Worked example

A man 5 ft 10 in (10 inches over 5 ft):

Frequently asked questions

Why do the formulas give different answers?
Each formula (Robinson, Miller, Devine, Hamwi) was derived from different populations and data, so they disagree by a few kilograms. That's why we show all four plus a BMI range — treat the spread as a healthy target zone rather than a single number.
Do these formulas account for muscle or build?
No. They use only height and sex, so a very muscular or large-framed person may sit healthily above the estimate. Body fat percentage and waist measurements give a fuller picture of healthy weight.
Is BMI or ideal body weight better?
They're complementary. The BMI healthy range gives a band of weights that's appropriate for your height; the ideal-weight formulas give a single point estimate often used in medicine for dosing. Both are screening tools, not diagnoses.

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