Ideal Weight Calculator
Find your ideal body weight using four evidence-based formulas — Robinson, Miller, Devine, and Hamwi — and see the healthy BMI weight range for your height.
| Formula | Year | Basis |
|---|---|---|
| Robinson | 1983 | Height & sex |
| Miller | 1983 | Height & sex |
| Devine | 1974 | Clinical drug dosing |
| Hamwi | 1964 | Frame-size standard |
| Formula | kg | lbs | vs Average |
|---|---|---|---|
| Enter your height to see results | |||
See your estimated ideal body weight from four long-used clinical formulas — Robinson, Miller, Devine, and Hamwi — alongside the wider, more realistic healthy BMI weight range.
How Ideal Weight Calculator Works
All four formulas share the same basic structure: a base weight for 5 feet of height, plus a fixed amount added for every inch above that. For men, Robinson (1983) uses 52 kg + 1.9 kg/inch, Miller (1983) uses 56.2 kg + 1.41 kg/inch, Devine (1974) uses 50 kg + 2.3 kg/inch, and Hamwi uses 106 lbs + 6 lbs/inch (converted to kg). Female versions use different base weights and per-inch increments, generally producing lower figures for the same height.
These formulas were originally developed for clinical purposes like drug dosing (Devine) or nutritional assessment (Hamwi) rather than as fitness targets, which is why they produce a single "ideal" number rather than a range — and why they don't account for frame size, muscle mass, or individual body composition.
Because a single-point target can be misleading, the calculator also shows the healthy BMI weight range (18.5–24.9) for your height, which is generally considered a more realistic and clinically useful target than any single ideal-weight formula alone.
See It In Action
Who Uses Ideal Weight Calculator and Why
- Getting a general reference point for weight when starting a new health or fitness goal.
- Comparing several long-used clinical formulas side by side instead of relying on just one.
- Understanding how a single "ideal weight" figure compares to the wider healthy BMI range for the same height.
Mistakes to Avoid
- Fixating on hitting the exact average of the four formulas as a personal target — none of the four accounts for muscle mass, frame size, or individual body composition.
- Not realizing these formulas were built for specific clinical purposes (like Devine for medication dosing) rather than as general fitness or aesthetic goals.
- Ignoring the wider healthy BMI range shown alongside the four point estimates, which is usually the more practical target to sit within.
Tips for Best Results
- Treat the four-formula average as a rough midpoint reference, and aim to land anywhere within the healthy BMI range shown next to it rather than one exact number.
- If you know you carry more muscle than average, expect your actual healthy weight to run above these formulas' estimates — pair this result with a body fat calculator for better context.
Fixing Common Problems
The four formulas gave noticeably different numbers. — That's expected — each formula was developed decades apart by different researchers using different reference populations. None is definitively correct; use the range they collectively suggest rather than any single value.
Terms Explained
Ideal body weight (IBW): A single-point weight estimate for a given height, originally developed for clinical uses like drug dosing rather than as a general fitness target.