The formulas
Each formula starts from a base weight at 5 feet (about 152 cm) and adds a set amount per additional inch of height. The four differ in their constants, which is why a range is the most useful takeaway.
Using the result
Consider it a rough target, not a strict rule. Body composition, frame size and health goals all matter — pair this with BMI and body-fat estimates for a fuller picture.
Frequently asked questions
How is ideal weight calculated?
Several classic formulas estimate a healthy weight from your height and sex. CalcNow shows the Robinson, Miller, Devine and Hamwi results and a suggested range from them.
Why do the formulas differ?
Each was derived from different data, so they give slightly different numbers. A range is more meaningful than any single value.
Is ideal weight the same as a healthy weight?
Not exactly. These formulas ignore muscle mass and body composition, so treat the result as a general guide alongside measures like BMI and body fat.
For general information only — not medical advice.