Ideal Weight Calculator
Find your ideal weight range using multiple validated medical formulas.
Health
Ideal Weight Calculator
Generated on April 24, 2026
?What is the Ideal Weight Calculator?
An ideal weight calculator estimates a healthy weight range for your height using multiple medically validated formulas — Robinson, Miller, Devine, and Hamwi — alongside the BMI-based healthy range (18.5–24.9). These classical formulas were originally developed for medication dosing (where body weight matters for dose calculation) but have been adopted widely as healthy-weight references. Showing several formulas together reveals that 'ideal weight' is a range, not a single number — different methods give slightly different values because they were developed with different populations and assumptions.
The Formula
All four classic formulas start from a baseline weight at 5 ft (60 inches) height and add a fixed increment per inch above that baseline. The four authors (Robinson, Miller, Devine, Hamwi) derived slightly different baselines and increments from different study populations, so their numbers differ by a few kilograms. The BMI-based range covers all weights that yield BMI 18.5–24.9 for a given height, which is the widest-accepted modern definition of healthy-weight range.
Practical Examples
A 175 cm male: Robinson ≈ 70 kg, Miller ≈ 74 kg, Devine ≈ 72 kg, Hamwi ≈ 75 kg, BMI range 56.7–76.3 kg — a span of roughly 20 kg.
A 165 cm female: Robinson ≈ 57 kg, Devine ≈ 57 kg, Miller ≈ 60 kg, BMI range 50.4–67.8 kg — showing the importance of seeing a range.
A 180 cm male: Robinson ≈ 73.5 kg, Miller ≈ 77 kg, Hamwi ≈ 79 kg.
A 155 cm female: Robinson ≈ 53.5 kg, Devine ≈ 50 kg, BMI range 44.4–59.8 kg.
A tall 190 cm man has a wide healthy range of approximately 67 to 90 kg under BMI guidelines — different body frames naturally sit in different spots within that range.
A short 150 cm adult has a narrower range (42–56 kg) but same principle applies — frame size and muscle mass determine where within the range is 'right'.