Free & private

Ideal Weight Calculator

Estimate your ideal weight and a healthy weight range from your height, using the classic Devine, Robinson and Hamwi formulas.

⚖Your result will appear hereAdd your sex and height, then select calculate to see your estimated ideal weight.

Averaged ideal weight estimate

0^kg

Average of three formulas

0Devine

0Robinson

0Hamwi

Healthy weight range (±10%)

These are general population-based estimates. They do not account for frame size, muscle mass or individual body composition — use them as a starting reference only.

How to use the ideal weight calculator

This free calculator works with metric and imperial units. Select your sex, choose your units, and enter your height, then select calculate. Everything runs locally in your browser, so nothing is uploaded or stored by this tool.

1. Select sex & units

Choose male or female, then metric or imperial height.

2. Enter your height

Use centimeters, or feet and inches.

3. Review your estimate

See three formula results, their average, and a healthy range.

Understanding your ideal weight estimate

Ideal body weight formulas were originally developed to help estimate medication dosing, and later became popular as general reference weights. This calculator averages three well-known formulas and adds a practical ±10% range around that average.

Devine formula

Men: 50 + 2.3 × (height in inches − 60). Women: 45.5 + 2.3 × (height in inches − 60), in kilograms.

Robinson & Hamwi formulas

Robinson and Hamwi use similar height-based logic with slightly different constants, giving a useful spread of estimates.

A limitation to know

None of these formulas account for muscle mass, bone density or frame size, so treat the range as a starting point, not a target.

What formulas are used to estimate ideal weight?

This calculator uses three classic formulas — Devine, Robinson and Hamwi — which estimate ideal body weight from height and sex, and averages the three.

Why do the three formulas give different results?

Each formula was developed from a different population and era, so results vary slightly. Averaging them gives a more balanced estimate.

What is the healthy range shown?

The range is the averaged estimate plus or minus 10%, a practical band rather than a strict cutoff.

Do these formulas account for muscle mass or frame size?

No. They are general estimates based only on height and sex, and do not account for muscle mass, frame size or body composition.