Four formulas compared
Devine, Robinson, Miller and Hamwi each give a slightly different ideal weight, so you see the range rather than one arbitrary number.
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Ideal Weight Calculator
A healthy weight for your height from four classic formulas plus BMI.
- Input
- No upload needed — instant
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
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Overview
About the Ideal Weight Calculator
Find a healthy weight for your height and sex using the Devine, Robinson, Miller and Hamwi formulas, alongside the weight range for a healthy BMI of 18.5 to 24.9.
"Ideal body weight" formulas estimate a healthy weight from your height and sex. They were originally built for medical dosing, and each gives a slightly different answer. This calculator shows four of them together, plus the weight range for a healthy BMI, so you get a realistic target rather than a single rigid number.
The formulas
All four add a base weight to an amount per inch over five feet:
Devine (men): 50.0 kg + 2.3 kg per inch over 5 ft
Robinson (men): 52.0 kg + 1.9 kg per inch over 5 ft
Miller (men): 56.2 kg + 1.41 kg per inch over 5 ft
Hamwi (men): 48.0 kg + 2.7 kg per inch over 5 ftWomen use a lower base with a similar slope.
Use the range
Because these formulas ignore muscle and frame, the healthy BMI range for your height (a BMI of 18.5 to 24.9) is usually the better guide. Most people find their real target sits somewhere within it.
Private and precise
This calculator produces estimates from published formulas and is not medical advice. For anything about your health, talk to a doctor or a registered dietitian.
Step by step
How to use the Ideal Weight Calculator
Choose your units and biological sex.
Enter your height.
Read the ideal weight from four formulas and the healthy BMI weight range.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Healthy BMI range too
Alongside the formulas it shows the weight range for a BMI of 18.5 to 24.9 at your height, which is usually the more useful target.
Metric or imperial
Enter height in centimetres or inches and get results in kilograms or pounds.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
What is the best ideal-weight formula?
There is no single best. Devine is the most widely used, especially in medicine for dosing, but Robinson, Miller and Hamwi give similar results. Comparing all four, and the BMI range, is more honest than trusting one number.
Why is a range better than one number?
Because 'ideal' weight depends on muscle, bone and frame, which these formulas ignore. A healthy BMI range (18.5–24.9) allows for that variation, so aim for the range rather than an exact figure.