Ideal Weight Calculator

Find your ideal body weight

This ideal weight calculator estimates ideal body weight (IBW) from your height and sex. Instead of one number, it uses four well-known formulas and shows the range they give, their average and each result on its own.

How to use it

1. Select male or female.
2. Enter your height in centimetres, or switch to feet and inches. Heights from 100 cm to 250 cm are accepted.
3. Choose kg or lbs for the results.
4. Read the ideal weight range, the average of all four formulas and the comparison chart.

The four formulas

Each formula starts with a base weight for a height of 5 feet (60 inches) and adds a fixed amount for every inch above that. Results are in kg.

Formula	Men	Women
Devine (1974)	50 + 2.3 per inch	45.5 + 2.3 per inch
Robinson (1983)	52 + 1.9 per inch	49 + 1.7 per inch
Miller (1983)	56.2 + 1.41 per inch	53.1 + 1.36 per inch
Hamwi (1964)	48 + 2.7 per inch	45.4 + 2.2 per inch

Example: a man who is 175 cm tall is 68.9 inches, or 8.9 inches over 5 feet. The results are Devine 70.5 kg, Robinson 68.9 kg, Miller 68.7 kg and Hamwi 72.0 kg. The tool shows a range of 68.7 – 72.0 kg and an average of 70.0 kg. For lbs, each kg value is multiplied by 2.20462.

Tips for reading the results

• Treat the range as a rough guide, not a single target.
• These formulas were built for adults around 5 feet tall or more. Results for shorter heights are less reliable.
• The formulas ignore muscle mass, frame size, age and body composition, so athletes often weigh more than the result.

Results are estimates for general information only and are not medical advice. Speak to a doctor or dietitian about a healthy weight for you.

Frequently asked questions

Why do the four formulas give different answers?

They were made at different times from different data. Miller usually gives the lowest change per inch and Hamwi the highest, so the gap grows with height.

Does it use BMI?

No. This tool uses only the Devine, Robinson, Miller and Hamwi formulas. It does not calculate BMI.