Ideal Weight Calculator
Estimate your ideal body weight from your height across four classic formulas.
How to use the ideal weight calculator
- Choose units and your sex.
- Enter your height.
- Click Calculate to compare the four formula estimates.
A range, not a target
The four formulas usually disagree by several kilograms, which is the point — treat the spread as a healthy range rather than a single number to chase.
Why 'ideal weight' is a range, not a number
Classic formulas like Devine, Robinson, Miller, and Hamwi estimate a healthy weight from height, but they were derived for clinical dosing rather than athletic goals. They ignore muscle mass and frame size, so treat the output as a reference range rather than a target to chase.
Better questions than ideal weight
For most people, body-fat percentage, waist measurement, fitness, and how they feel and perform are more useful than a single 'ideal' figure. A muscular athlete may sit well above their formula weight while being lean and healthy. Use this tool for orientation, then judge yourself on composition and performance.
What the four formulas say, by height (men)
| Height | Devine | Robinson | Miller | Hamwi |
|---|---|---|---|---|
| 165 cm (5 ft 5 in) | 61 kg | 61 kg | 63 kg | 61 kg |
| 170 cm (5 ft 7 in) | 66 kg | 65 kg | 66 kg | 67 kg |
| 175 cm (5 ft 9 in) | 70 kg | 69 kg | 69 kg | 72 kg |
| 180 cm (5 ft 11 in) | 75 kg | 73 kg | 71 kg | 77 kg |
| 185 cm (6 ft 1 in) | 80 kg | 76 kg | 74 kg | 83 kg |
Men's figures; women's run roughly 4-5 kg lower at each height. Notice how the four agree within a couple of kilograms at average height but spread to nine kilograms apart by 185 cm. That divergence is the clearest evidence they are rough clinical estimates, not precise targets — which is why a range beats any single number.
Frequently asked questions
How is ideal weight calculated?
Classic formulas base ideal weight on a baseline at five feet of height, adding a set amount per inch above that. Different formulas use slightly different constants.
Is there one true ideal weight?
No. These formulas give a reference range and ignore build and muscle. A healthy weight is best judged with body composition and how you feel and perform.
Which ideal weight formula should I trust?
They cluster closely for average heights. Rather than pick one, treat the spread across formulas as a healthy range and consider body composition alongside it.
Why is my ideal weight different from my goal weight?
Ideal-weight formulas ignore muscle and personal goals. An athletic goal weight can sensibly sit above the formula figure if you carry more muscle.
Does frame size affect ideal weight?
Yes. Larger-framed people naturally sit higher in or above the range, which is one reason these formulas are only a rough guide.
Related tools
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Calculate your Body Mass Index and see which WHO weight category it falls into.
Body Fat Calculator
Estimate your body-fat percentage using the U.S. Navy circumference method — just a tape measure required.
Lean Body Mass Calculator
Estimate how much of your body weight is lean mass versus fat using the Boer formula.