Ideal Body Weight Calculator
This ideal weight calculator estimates an ideal body weight from your height and sex using four established formulas — Devine, Robinson, Miller and Hamwi — and shows each result, their range and their average in kg and lbs.
About this tool
This ideal weight calculator estimates an ideal body weight from your height and sex using four established formulas — Devine, Robinson, Miller and Hamwi — and shows each result, their range and their average in kg and lbs.
How to use it
- Choose your sex.
- Enter your height in cm or inches.
- Read the ideal weight from each of the four formulas.
- Use the range and average as a reference point, not a strict target.
Good to know
- All four formulas start from a base weight at 5 feet (152.4 cm) and add a fixed amount per inch above that.
- Devine: 50 kg (men) or 45.5 kg (women) + 2.3 kg per inch over 5 feet.
- Robinson: 52 kg + 1.9 kg per inch (men) or 49 kg + 1.7 kg per inch (women).
- Miller: 56.2 kg + 1.41 kg per inch (men) or 53.1 kg + 1.36 kg per inch (women); Hamwi: 48 kg + 2.7 kg or 45.5 kg + 2.2 kg per inch.
- The formulas were developed mainly for medication dosing and ignore muscle mass and frame size.
Runs entirely in your browser — nothing you enter is uploaded or stored.
Frequently asked questions
What is my ideal weight for my height?
Enter your height above to see four estimates; for most adults they fall within a range of a few kilograms. Treat that range as a guide, since healthy weight also depends on muscle, frame and health markers.
Which ideal weight formula is most accurate?
None is definitive. The Devine formula is the most widely used in medicine, while Robinson and Miller were later refinements; averaging them gives a reasonable middle estimate.
Why is my ideal weight different from a BMI range?
Ideal weight formulas give a single value per height, while BMI defines a healthy range (18.5–24.9). A weight can be above an ideal-weight formula and still be within the healthy BMI range.
Do these formulas work for very short or very muscular people?
They are less reliable below 5 feet and for athletes with a lot of muscle, who can weigh more than the formulas suggest while being lean. Body fat percentage is a better measure in those cases.