Ideal weight calculator tools estimate a healthy target weight range based on your height, sex, and body frame. This free browser-based tool uses established formulas including Devine, Robinson, and Miller to give you a realistic reference point. No signup required. The result is a general guideline rather than a prescription, useful for setting realistic fitness goals or discussing weight targets with a healthcare provider.
Ideal Body Weight Calculator is a free browser-based tool that estimates a target body weight range based on height and sex, using established clinical formulas. Ideal body weight estimates are used in medical settings for dosing certain medications (particularly those that are highly lipophilic or have a narrow therapeutic index), assessing nutritional needs, and providing a reference point for weight management discussions. The tool calculates results using multiple established formulas (Devine, Robinson, Miller, and Hamwi) and displays all results alongside the range they span, giving a more complete picture than any single formula alone. It supports both metric and imperial inputs. No account or installation is required.
Ideal Body Weight Calculator produces estimates using four of the most widely cited formulas in clinical practice, each developed at different times and for slightly different applications. The Devine formula, published in 1974 and originally developed for medication dosing, is the most widely used in clinical pharmacology. The Robinson, Miller, and Hamwi formulas were developed around the same era and are used interchangeably in different clinical contexts. Because the formulas were developed from data on mid-twentieth century adult populations, their absolute values should be interpreted as reference points rather than prescriptive targets, particularly for individuals with above-average musculature, very short stature, or older age where body composition norms differ from the formula assumptions. The range spanned by the four formulas gives a realistic sense of the uncertainty in any single estimate: a difference of two to four kilograms between formula outputs is normal. In clinical medication dosing, the Devine formula is typically used by default, but the comparison with other formulas helps identify whether the specific patient's physique is close to the formula assumptions. For weight management purposes, ideal body weight is a less clinically meaningful target than a healthy BMI range, since the formulas do not account for body composition. The BMI Calculator and this tool together provide complementary perspectives on weight relative to height. The tool runs free in the browser with all calculations done locally without any data sent to a server.