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Ideal Weight Calculator

See your ideal weight range using the Devine, Robinson, Miller and Hamwi formulas and the healthy BMI range.

How to use

See your ideal weight range using four well-known formulas (Devine, Robinson, Miller and Hamwi) alongside the healthy BMI range of 18.5–24.9. The formulas were designed for adults and depend only on height and sex, so they ignore muscle, age and body frame. Use them as a rough guide, not a target.

  1. Enter your details.
  2. Results update instantly.
  3. Adjust the values to see how they change.

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Frequently asked questions

Which formula is best?

None is perfect. They give similar answers for average heights, so many people look at the range between them together with the healthy BMI range.

Do these apply to everyone?

They are intended for adults and do not account for muscle mass, age or medical conditions.

Is it free?

Yes. Everything is free, with no sign-up and no limits.

Is my data stored or sent?

No. Calculations run in your browser and nothing you enter is sent or stored.

Can I rely on these results?

They use standard published formulas and give estimates for general information.

For general information only. This is not medical advice. Talk to your doctor, midwife or dietitian about your own situation.