It calculates adult ideal body weight with Devine, Robinson, Miller and Hamwi formulas, then compares the result with the BMI 18.5–24.9 healthy weight range for your height.

Each formula uses a different historical equation and baseline. The average is useful as a central estimate, while the healthy range gives more context for normal variation in build and body composition.

Not always. Ideal weight formulas do not directly measure muscle, fat distribution, age, ethnicity, training status, pregnancy or medical needs. Use the result as a planning estimate, not a diagnosis.