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Ideal Weight Calculator

Compare four ideal weight formulas plus the healthy BMI range.

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What each formula says

They disagree, which tells you how approximate the whole idea is.

Healthy weight range

—

From a BMI of 18.5 to 24.9 at your height.

Average of the four formulas—
Spread between them—
Frame adjustment—

Enter a weight to see where it sits in the healthy range.

These formulas were derived for clinical purposes such as drug dosing, not as health targets, and none accounts for muscle mass or body composition. Read the healthy BMI range as a band rather than any single number as a goal, and speak to a clinician about what is right for you.

Quick Tool Overview

The Ideal Weight Calculator shows what four widely used ideal body weight formulas predict for your height and sex, together with the healthy range implied by a BMI of 18.5 to 24.9. They are presented side by side deliberately, because they disagree.

What it does
Compares four ideal weight formulas and the healthy BMI range
You give it
Your height, sex and optionally frame size
You get back
Four predicted weights plus a healthy weight band
Best for
Orientation and context, not a target to hit
Calculators Free, unlimited use No sign-up Runs in your browser

About the Ideal Weight Calculator

Enter your height and sex to see what four widely used ideal body weight formulas predict, shown together with the healthy weight range implied by a BMI of 18.5 to 24.9. Frame size can be adjusted where the formula supports it.

They are presented side by side deliberately, because they disagree, sometimes by several kilograms at the same height. Most originated in clinical settings for drug dosing rather than as health targets, and none accounts for muscle mass, frame or body composition. Read the healthy BMI range as a band to sit within rather than any single formula as a number to hit, and treat the whole page as orientation rather than a goal.

Key features of the Ideal Weight Calculator

Four formulas together

Devine, Robinson, Miller and Hamwi are shown side by side, sometimes disagreeing by several kilograms at the same height.

Healthy BMI range alongside

A band to sit within is more useful than any single formula's number to hit.

Frame size adjustment

Applied where the formula supports it, since build genuinely varies at the same height.

Clear about the origins

Most of these formulas came from clinical settings for drug dosing rather than as health targets, and none accounts for muscle mass.

Metric and imperial

Results are given in kilograms and in stones and pounds.

How to use the Ideal Weight Calculator

  1. 1

    Enter your height

    Use metric or imperial units, whichever you measure in.

  2. 2

    Select your sex

    Every one of these formulas is sex-specific.

  3. 3

    Compare the results

    The four formulas are shown together with the healthy BMI range, so you can see the spread rather than one figure.

Frequently asked questions

None is authoritative. Devine is the most commonly cited and is still used for some drug dosing, but all four were derived for clinical purposes rather than as health targets. The healthy BMI range is a more useful guide.

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