Ideal Weight Calculator
Determine ideal weight ranges using BMI, Devine, Hamwi, Robinson, and Miller formulas plus body frame estimation.
Measurements
Current BMI:
Healthy weight range:
Frame size:
Devine ideal weight:
Hamwi ideal weight:
Robinson ideal weight:
Miller ideal weight:
Use this as a guideline; talk to a healthcare professional before making weight or nutrition changes.
Why so many different formulas?
Devine, Hamwi, Robinson, and Miller are all decades-old regression formulas originally developed to estimate a "reference" weight for medical drug dosing, not necessarily an aesthetic or fitness target — they typically agree reasonably closely but were derived from different study populations, which is why each gives a slightly different number. The BMI-based healthy range and the wrist-based frame size estimate offer a complementary, body-composition-aware perspective alongside those formulas.
Frequently asked questions
Which formula should I trust most? None is definitively "correct" — they were built for different original purposes (mainly medication dosing calculations) and none accounts for muscle mass, bone density, or body composition, so treat them as a general reference range rather than a precise personal target.
Why does frame size matter? A larger bone/frame structure can support a healthy weight toward the higher end of a BMI-based range, while a smaller frame may be healthier toward the lower end — the wrist-circumference-to-height ratio used here is a simple, commonly cited proxy for frame size.
Should athletes use these numbers? Be cautious — someone with high muscle mass will likely weigh more than these formulas suggest while still being lean and healthy, since none of these equations distinguish muscle from fat.