Ideal Weight Calculator
Enter a valid height.
These formulas were developed decades ago for drug-dosing purposes, not as health targets — they don't account for muscle mass, frame size, or your actual body composition. Showing all four (instead of just one, like most calculators) makes clear this is a rough estimate with real spread, not a precise target.
Free ideal weight calculator showing all four classic formulas (Devine, Robinson, Miller, Hamwi) side by side — not just one number, so you can see how much these decades-old formulas actually disagree.
How it works
- Enter your sex and height
- See all four formulas' results plus their average
Frequently asked questions
Why do the four formulas give different answers?
They were developed independently between 1964 and 1983, mostly for medical drug-dosing purposes, using different population data. Showing all four instead of just one makes clear this is a rough historical estimate with real spread, not a single precise number.
Should I aim for this weight?
Not necessarily — these formulas don't account for muscle mass, bone density, or frame size. They're a general reference point, not a personalized health target. A healthy weight range based on BMI, or a conversation with a healthcare provider, is more useful for that.
Related tools
From the blog
Update history
- 2026-09-03 Height is now a slider instead of a number field, and the sex toggle shows an icon for each option.
- 2026-09-01 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
- 2026-09-01 Launched: ideal weight calculator showing all four classic formulas (Devine/Robinson/Miller/Hamwi) plus their average, instead of just one. Entirely client-side, reuses the body composition engine.