Ideal Weight Calculator.

Find your ideal weight range using five established medical formulas. Results are shown in both kg and lbs.

Sex

Height (cm)

Height (ft + in)

How to find your ideal weight range

Select your sex.
Enter your height.
Read the five formula results side by side — Devine, Robinson, Miller, Hamwi and the BMI-based range.
Treat the spread between them as the answer; they disagree by several kilograms, and none is authoritative.

About Ideal Weight Formulas

Different medical formulas give different results because they were derived from different populations and studies. None of them is definitively "correct" — they are all approximations. The BMI healthy weight range (18.5–24.9 kg/m²) is the most widely accepted current standard.

Devine (1974)

Widely used in pharmacology for drug dosing.

Robinson (1983)

Revision of Devine formula for clinical use.

Miller (1983)

Another revision, differs for taller individuals.

Hamwi (1964)

One of the original ideal body weight formulas.

Frequently Asked Questions

What is my ideal weight for my height?

It depends on the formula. For a man 175 cm (5 ft 9 in) tall, Devine gives 70.5 kg, Robinson 68.9 kg, Miller 68.7 kg and Hamwi 72.0 kg. The BMI healthy range for the same height, 18.5 to 24.9, spans about 56.7 to 76.3 kg.

Which ideal body weight formula is best?

None is definitive. Devine (1974) was designed for drug dosing and is the most widely used in medicine; Robinson and Miller (1983) are revisions of it; Hamwi (1964) is the oldest. Their spread of a few kilograms is itself useful, because it shows that ideal weight is a range, not a number.

How do the formulas work?

Each starts from a base weight at 5 ft (152.4 cm) and adds a fixed amount per inch above it. Devine, for example, is 50 kg + 2.3 kg per inch for men and 45.5 kg + 2.3 kg per inch for women. That is why they are least reliable for very short or very tall people.

Do ideal weight formulas account for muscle?

No. They use only height and sex, so a muscular person can sit well above every formula while being lean. For body composition, pair this with a body fat estimate, which measures what the weight is made of.

Sources · Reviewed 24 September 2026

Devine BJ (1974), Drug Intell Clin Pharm 8:650–655
Robinson JD et al. (1983) and Miller DR et al. (1983), Am J Hosp Pharm
Hamwi GJ (1964), Therapy: changing dietary concepts