What does this tool do?
The Ideal Weight Calculator gives a healthy weight range based on your height and gender using the Robinson, Miller, Hamwi, and Devine formulas plus a BMI-based range. It is a practical starting point for anyone setting goals, fitness enthusiasts, and people tracking their general health.
How to use it
- Enter your values into the fields.
- The result is calculated instantly.
- Read or copy the result.
Five formulas, one range
There is no single 'correct' ideal weight, so the tool calculates five separate methods side by side. The Robinson (1983), Miller (1983), Hamwi (1964), and Devine (1974) formulas each add a fixed amount of weight for every inch above five feet of height. The fifth row applies the midpoint of the 18.5-24.9 BMI range to your height. The results panel shows the lowest and highest of all methods as a single range, so you are not anchored to one number.
Unit and gender options
You can enter your height in centimeters or switch to inches with one click, and the tool converts automatically. The formula coefficients differ for men and women, so the gender button directly affects the result. Every value is displayed in both kilograms and pounds, and you can copy the range with a single tap. The calculation runs entirely in your browser, so nothing you enter is stored or transmitted.
Frequently asked questions
Which formula should I rely on?
No single formula is definitive. The Devine formula is common for clinical drug dosing, but for everyday use it is more realistic to treat the range formed by all five methods as a general target.
Why does it only ask for height and gender?
The classic ideal weight formulas it uses depend only on height and gender. Age, muscle mass, and body frame are not considered, so view the result as a guiding range rather than an exact target.
Are the results accurate for athletes?
Muscular athletes may sit above the suggested range because these formulas cannot distinguish muscle from fat. In those cases, body fat percentage is a more meaningful measure.
Is Ideal Weight Calculator free?
Yes. Ideal Weight Calculator and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Ideal Weight Calculator works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.