About ideal body weight
This calculator estimates your ideal body weight from your height and sex using four classic formulas — Devine, Robinson, Miller and Hamwi — and shows a healthy weight range based on BMI. These are guides based on height alone and do not account for build or muscle, so use them alongside other measures. It runs in your browser.
How Ideal Weight works
How to use it
- Choose your sex and enter your height (cm or inches).
- Pick whether to show results in kg or lb.
- Read the average ideal weight, the healthy BMI range and each formula.
The formulas
Devine, Robinson, Miller and Hamwi each estimate ideal weight from height, adding a set amount per inch above 5 feet. They differ slightly, so the tool also shows their average.
Use with care
Ideal-weight formulas ignore frame size and muscle, so a muscular person may sit above the range while being perfectly healthy. The healthy BMI range is often a more practical target.
Common uses
- Estimate a healthy target weight
- Compare classic ideal-weight formulas
- See a healthy BMI weight range
- Set a realistic weight goal
- Check weight against height
- Support a fitness plan
- Convert results to kg or lb
- Get a quick health reference
Frequently asked questions
How is ideal weight calculated?
From your height and sex using formulas like Devine that add weight per inch above 5 feet. This tool shows several plus their average.
Which formula is best?
They are all rough guides; the tool averages them and also gives a healthy BMI range, which is often more useful.
Do these account for muscle?
No — they use height alone, so muscular people may weigh more while still being healthy.
What is a healthy BMI?
Generally 18.5–24.9; the tool converts that to a weight range for your height.
Can I use feet and inches?
Enter your height in inches (or centimetres) and choose kg or lb output.
Is my data uploaded?
No — it calculates in your browser.
Is this medical advice?
No — it is a general guide; consult a professional for personal advice.
Is it free?
Yes — completely free with no sign-up.