Ideal Weight Calculator
Find your ideal weight using Devine, Robinson, Miller, and Hamwi formulas.
Loading Smart Logic...
Quick Tip
Select your sex and enter your height.
About This Tool
Why use Ideal Weight Calculator?
Ideal body weight formulas were developed to guide medication dosing and nutrition planning, not to set a beauty standard. This calculator shows four of them — Devine, Robinson, Miller and Hamwi — plus their average and the weight range that corresponds to a BMI of 18.5 to 24.9.
All four work the same way: a base weight for the first 5 feet (152.4 cm) of height, plus a fixed amount per additional inch. Devine (1974), the most cited, uses 50 kg + 2.3 kg per inch for men and 45.5 kg + 2.3 kg for women. The results differ by a few kilograms, which is a fair reminder that there is no single correct weight — the BMI range is usually the more practical target.
Key Benefits
Four published formulas
Devine, Robinson, Miller and Hamwi, so you can see how much the accepted figures vary.
BMI range for context
The 18.5–24.9 weight band for your height gives a realistic target range rather than a single number.
Same basis as clinical use
These are the formulas used for drug dosing and nutrition support, which is what they were designed for.
How to use Ideal Weight Calculator
- 1
Select your sex and enter your height.
- 2
Compare the four formula results and their average.
- 3
Check the healthy BMI range shown alongside, which is broader and more realistic.
- 4
Treat the numbers as reference points, not goals to hit exactly.
Best use cases
Get a reference weight range for your height.
Understand a figure quoted by a clinician or a fitness app.
Compare formula-based ideal weight with the healthy BMI band.
Set a realistic target before starting a weight programme.
Ideal Weight Calculator FAQs
Which ideal weight formula should I use?
Devine is the most widely cited and is standard for medication dosing. Robinson and Miller were later revisions that tend to give slightly lower figures. For everyday purposes the healthy BMI range is more useful than any single formula.
Do these formulas account for build or muscle?
No. They use height and sex only. A muscular or large-framed person can be healthy well above the formula weight, which is why the BMI range is shown alongside.
Why do the four results differ?
Each was developed from a different population and purpose, and each uses a different base weight and per-inch increment. A spread of a few kilograms between them is normal.
Are they suitable for children?
No. These formulas are for adults. Children and teenagers are assessed with age-and-sex growth charts instead.
Related Health Tools
More free health tools that work well alongside ideal weight calculator.