Ideal Weight Calculator
See what four established medical formulas say your ideal weight is for your height — and, more usefully, the healthy weight range that goes with it.
Ideal weight (average of four formulas)
65.9 kg
Healthy BMI range
53–66 kg
Indian (ICMR) cut-offs
Height
170 cm
66.9 inches
| Formula | Ideal weight | Notes |
|---|---|---|
| Devine (1974) | 65.9 kg | The standard in clinical drug dosing |
| Robinson (1983) | 65.2 kg | A refinement of Devine |
| Miller (1983) | 66.0 kg | Gives a slightly higher figure |
| Hamwi (1964) | 66.7 kg | Widely used by dietitians |
These formulas produce a single number, but a healthy weight is a range. For your height that range is 53 to 66 kg — anywhere inside it is fine.
These equations were developed for medical drug dosing, not as beauty standards, and none accounts for frame size or muscle mass. A muscular person can sit well above their so-called ideal weight and be perfectly healthy. The BMI range is the more useful guide.
Frequently Asked Questions
Which formula should I trust?
None of them exclusively. They were developed for calculating drug dosages, not for setting personal goals, and they disagree with each other by several kilograms. The healthy BMI range is the more meaningful guide.
Why do the formulas give different answers?
Each was derived from a different population and fitted with different constants. Miller consistently produces the highest figure and Hamwi the lowest, with a spread of three to five kilograms at typical heights.
Do these account for body frame or muscle?
No, and that is their main weakness. A muscular person can sit well above their calculated ideal weight and be in excellent health, because muscle is denser than fat.
Is there one ideal weight?
No. Health outcomes are similar across a fairly wide band, which is why the BMI range spanning several kilograms is a better target than any single number.