Free online tool
Ideal Weight Calculator
Four classic formulas, all shown side by side, based on your height and gender.
| Formula | Ideal weight |
|---|---|
| Devine | 70.5 kg (155.3 lb) |
| Robinson | 68.9 kg (151.9 lb) |
| Miller | 68.7 kg (151.6 lb) |
| Hamwi | 72.0 kg (158.8 lb) |
Where "ideal weight" comes from
The concept dates back to insurance actuarial tables from the mid-20th century, when statisticians tried to correlate weight with mortality risk. Several doctors — Devine, Robinson, Miller, and Hamwi — each proposed slightly different formulas, all based on height and gender. None is universally accepted as "the" answer, which is why this tool shows all four.
How to interpret the numbers
Treat the range as a rough guide, not a target. Frame size, muscle mass, ethnicity, and age all shift what's actually healthy for you. If you want a more individualized number, combine this with a BMI check and a body-fat estimate rather than relying on any single figure.
+Which formula is most accurate?
There's no clear winner. Devine is the most widely used in medical settings, especially for drug dosing.
+Does it work for children?
No. Pediatric weight guidelines use growth curves specific to age and are very different from adult formulas.
Why use the Ideal Weight Calculator on ToolNest?
The Ideal Weight Calculator is one of more than forty free browser-based utilities we maintain on ToolNest. Every tool on the site is engineered around the same three promises: it must be fast, it must protect your privacy, and it must be genuinely useful without hiding features behind an account, a paywall, or an email capture form. Whether you use the Ideal Weight Calculatoronce a month or several times a day, it should feel like a native part of your workflow — open the tab, get the result, move on.
Everything happens directly inside your web browser. When you type, paste, or upload something into the Ideal Weight Calculator, that data never leaves your device. There is no server round-trip, no logging, no analytics pixel watching your keystrokes, and no third-party API silently receiving a copy of your input. Closing the browser tab is the same as clearing your session. This is a deliberate design choice: too many free "online tools" quietly funnel user content through remote servers, and we do not think a utility as small as this one justifies that risk.
Speed is the other pillar. The Ideal Weight Calculator loads on a cold connection in well under a second and stays responsive on older phones, low-power laptops, and metered mobile networks. There are no heavy frameworks layered on top of the tool, no autoplay video ads, and no blocking third-party scripts. Search engines like Google reward pages that load quickly and stay interactive, but more importantly, so do human visitors who came here to get one specific job done.
If the Ideal Weight Calculator saves you time, the best thing you can do is bookmark this page and share it with a colleague or classmate who might need it. We also welcome direct feedback — bug reports, feature requests, and suggestions for entirely new tools all go to the same inbox and are read by a human. The best tools on ToolNest started life as a one-line reader email, and this page will keep improving as long as people keep telling us what they wish it did better.