Ideal Weight Calculator

Q: How do I calculate my ideal weight?

Ideal-weight formulas use your height and gender. The Devine formula, for example, is 50 kg + 2.3 kg per inch over 5 feet for men, and 45.5 kg + 2.3 kg per inch over 5 feet for women. Because formulas differ, it is best to look at a healthy weight range rather than a single number.

Q: What is a healthy weight range for my height?

The range that corresponds to a BMI of 18.5 to 24.9 for your height. For 170 cm that is roughly 53.5 kg to 72 kg. This tool shows your exact range.

Q: Which ideal weight formula is most accurate?

No single formula is definitive; they are estimates from the 1970s used mainly for medication dosing. The Devine, Robinson and Hamwi formulas give slightly different numbers, so treating them as a range and combining with BMI, waist size and a doctor's advice is best.

Enter your height and gender to see your ideal body weight from three trusted formulas, plus your healthy weight range. Metric or imperial — everything stays on your device.

Find your ideal weight

Units

Gender

Height (cm)

How ideal weight is calculated

Ideal-weight formulas estimate a target body weight from your height and gender only. The three best-known were designed in the 1960s–70s (originally to help doctors dose medication):

Devine: men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg per inch over 5 ft.
Robinson: men 52 kg + 1.9 kg per inch over 5 ft; women 49 kg + 1.7 kg per inch over 5 ft.
Hamwi: men 48 kg + 2.7 kg per inch over 5 ft; women 45.5 kg + 2.2 kg per inch over 5 ft.

Because they disagree slightly, the smartest approach is to treat them as a range, not one magic number — which is exactly what the calculator shows, alongside your BMI-based healthy range.

Ideal weight vs healthy weight range

A single "ideal" figure ignores that healthy bodies come in a band, not a point. The healthy weight range here is the span that gives a BMI of 18.5–24.9 for your height — for most people a spread of 15–20 kg. Where you sit in that band depends on muscle, frame size and body composition. Athletes with high muscle mass may sensibly weigh above their "ideal" figure while being very healthy.

📖 Related: check your BMI, estimate daily calories to reach a target weight, or convert pounds ↔ kg with the Unit Converter.

Frequently asked questions

How do I calculate my ideal weight?

From height and gender. Devine (men): 50 kg + 2.3 kg per inch over 5 ft. Best viewed as a range with BMI.

What is a healthy weight range for my height?

The weights giving a BMI of 18.5–24.9. For 170 cm, about 53.5–72 kg. The calculator shows yours exactly.

Which ideal weight formula is most accurate?

None is definitive — they are estimates. Use them as a range alongside BMI, waist size and medical advice.

Does ideal weight depend on age?

These classic formulas use only height and gender, not age. Body composition does change with age, so treat the result as a guide.

Note: Ideal-weight formulas are general estimates, not medical advice, and are less reliable for very tall, very short, highly muscular or older people. Consult a doctor or dietitian for personal guidance.