Ideal Weight Calculator: Healthy Weight for Your Height

There is no single perfect weight, so this calculator gives a range. It shows the weight range that matches a healthy BMI and also the figures from four classic formulas so you can see how they compare.

FreeNo sign-upRuns in your browserUpdated 2 Nov 2026
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Your resultLive

Educational estimate only. It is not medical advice or a diagnosis. Talk to a doctor or registered dietitian before changing your diet or exercise.

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How to use this calculator

  1. Choose your sex.
  2. Enter your height in cm.
  3. Read the healthy range first. It is the most useful number.
  4. Compare with the four formulas if you want a single target.

The formula

Healthy range: height² × 18.5 to height² × 24.9 (height in metres). Devine: 50 kg (men) or 45.5 kg (women) + 2.3 kg per inch above 5 feet. Robinson: 52 + 1.9 or 49 + 1.7 per inch. Miller: 56.2 + 1.41 or 53.1 + 1.36 per inch. Hamwi: 48 + 2.7 or 45.5 + 2.2 per inch.

Worked example

A man who is 170 cm tall is 66.9 inches, which is 6.9 inches above 5 feet. Devine gives 50 + 2.3 × 6.9 = 65.9 kg, Robinson 65.2 kg, Miller 66.0 kg and Hamwi 66.7 kg. The BMI-based healthy range is 53.5 to 72 kg.

Understanding your result

The classic formulas were built to guide drug doses and give one number, so they cluster around the middle of the healthy range. Frame, muscle mass, age and ethnicity all change what is healthy for you, so use the range and focus on how you feel and perform.

When to use it

  • Set a realistic target weight range.
  • Compare formulas that clinicians use.
  • Check how far your weight is from the healthy band.

Assumptions and limits

Educational estimate, not medical advice. A doctor or registered dietitian can give guidance that fits your health. The formulas were designed for heights above 5 feet and for adults. They do not apply to children, pregnancy, or very muscular people.

Frequently asked questions

Is there one ideal weight?

No. A range is more honest. Healthy weight varies with frame, muscle and age.

Which formula should I trust?

They agree within a few kilograms. Treat them as rough guides, and the BMI range as the wider picture.

Are the formulas accurate for short people?

Less so. They assume heights above 5 feet, so results for shorter adults are rough.

Should I aim for the middle of the range?

Not necessarily. Many healthy people sit anywhere in the range.

Does ideal weight depend on age?

The formulas do not use age. Healthy ranges for older adults are sometimes slightly higher.