Question 1

How is ideal body weight calculated?

Accepted Answer

This calculator uses four clinically recognized formulas: Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964). Each uses your height, sex, and a base weight per inch above 5 feet to estimate ideal body weight. The final result is the average of all four formulas.

Question 2

What is the most accurate ideal weight formula?

Accepted Answer

The Devine formula is the most widely used in clinical practice for drug dosing, but no single formula is universally accurate. We show all four formulas plus the average so you can compare. For medical decisions, consult your doctor.

Question 3

Does ideal weight account for body frame or muscle mass?

Accepted Answer

The classic Devine, Robinson, Miller and Hamwi formulas do not consider body frame size or muscle mass. They are general estimates based on height and sex. Athletes and muscular individuals may weigh more than the formula suggests while still being healthy.

Question 4

Is this ideal weight calculator free and private?

Accepted Answer

Yes — completely free, no signup, no data sent anywhere. All calculations run in your browser.