Ideal Body Weight Calculator
Ideal Body Weight Calculator
Find your ideal body weight target based on your height and sex. Enter your details and see your IBW across four leading medical formulas — plus how far you currently are from it.
What is ideal body weight?
Ideal Body Weight (IBW) is an estimated weight range associated with good health outcomes for a given height and sex. It was originally developed in clinical settings to help calculate medication dosages and anesthesia, but it has since become a widely used benchmark in fitness and nutrition to set realistic, health-based weight goals.
Why does it matter?
Knowing your IBW gives you a data-driven weight target that goes beyond aesthetics. Whether you’re cutting fat, building muscle, or simply trying to reach a healthier baseline, your IBW tells you where science says your weight should roughly land for your frame.
It’s also useful for tracking progress — instead of chasing an arbitrary number on the scale, you can measure how close you are to a research-backed target.
The four formulas
- Devine → the original 1974 clinical formula, most widely used in medicine
- Robinson → a 1983 refinement with slightly lower targets for women
- Miller → a 1983 formula that tends to give higher IBW estimates
- Hamwi → a simple rule-of-thumb formula popular in dietetics
This calculator averages all four to give you the most balanced estimate possible.
IBW is a starting point, not a finish line — These formulas don’t account for muscle mass, bone density, or athletic build. A heavily muscled person will naturally weigh more than their IBW while still being in peak condition. Use it as a reference, not a rigid rule.
Sex
Units
Formula breakdown
| Formula | Ideal weight |
|---|---|
| Devine (1974) | — |
| Robinson (1983) | — |
| Miller (1983) | — |
| Hamwi | — |
Average of Devine, Robinson, Miller & Hamwi formulas · Healthy range = IBW ± 10%
