Ideal Weight Calculator

Compare ideal-weight estimates from the Devine, Robinson, Miller and Hamwi formulas.

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About the Ideal Weight Calculator

There is no single perfect weight, so this calculator shows estimates from four well-known medical formulas side by side: Devine, Robinson, Miller and Hamwi. Together they give a sensible range for your height and sex.

Example (Devine)

Men: 50 kg + 2.3 kg for each inch over 5 feet. Women: 45.5 kg + 2.3 kg per inch over 5 feet.

Good to know

These formulas were designed for medication dosing and don't account for muscle or frame size. Use the range as a guide, alongside BMI and waist measurements.

How to use Ideal Weight Calculator

  1. Enter your values. Units and defaults are shown beside each field.
  2. Press Calculate (results also update as you type once calculated).
  3. Read the result and the step-by-step breakdown with the formula used.
  4. Copy the result or reset to start again.

Frequently asked questions

How accurate is this calculator?

Calculations use the standard formulas shown on the page, computed in full precision and rounded only for display. The result is only as accurate as the inputs and assumptions listed.

Is this medical advice?

No. Health calculators give general estimates for information only and are not a diagnosis. Speak to a qualified health professional about your situation.

Is it free?

Yes. All tools are free to use without an account.