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Ideal Weight Calculator

Calculate your ideal body weight using three established formulas: Devine, Robinson, and Hamwi. Results are averaged to give a balanced estimate based on your height and gender.

Gender

Height (cm)

Fill in the fields above and click Calculate to see your results.

How to use

Calculate your ideal body weight using three established formulas: Devine, Robinson, and Hamwi. Results are averaged to give a balanced estimate based on your height and gender.

How it's calculated

Height (inches)

height_cm / 2.54

Height converted to inches for formula calculation

Inches Over 5 ft

max(0, height_in - 60)

Inches above 5 feet (60 inches) used in all three formulas

Devine (Male)

50 + 2.3 * inches_over_5ft

Devine formula for males

Devine (Female)

45.5 + 2.3 * inches_over_5ft

Devine formula for females

Robinson (Male)

52 + 1.9 * inches_over_5ft

Robinson formula for males

Robinson (Female)

49 + 1.7 * inches_over_5ft

Robinson formula for females

Hamwi (Male)

48 + 2.7 * inches_over_5ft

Hamwi formula for males

Hamwi (Female)

45.5 + 2.2 * inches_over_5ft

Hamwi formula for females

Devine Ideal Weight (kg)

(gender == 1) * devine_male + (gender == 2) * devine_female

Ideal weight by Devine formula

Robinson Ideal Weight (kg)

(gender == 1) * robinson_male + (gender == 2) * robinson_female

Ideal weight by Robinson formula

Hamwi Ideal Weight (kg)

(gender == 1) * hamwi_male + (gender == 2) * hamwi_female

Ideal weight by Hamwi formula

Average Ideal Weight (kg)

(devine_kg + robinson_kg + hamwi_kg) / 3

Average of Devine, Robinson, and Hamwi ideal weights

Examples

Male, 170 cm

Gender:1
Height (cm):170

Female, 160 cm

Gender:2
Height (cm):160

Frequently Asked Questions

Which ideal weight formula is most accurate?

No single formula is universally accurate. Devine (1974) was originally developed for drug dosing. Robinson (1983) and Hamwi (1964) are clinical alternatives. This calculator averages all three to give a balanced estimate. Individual factors like muscle mass and bone structure are not captured by any formula.

Why does the formula use height in inches?

All three formulas (Devine, Robinson, Hamwi) were developed using imperial measurements. The calculator automatically converts your height from centimetres to inches internally — you only need to enter your height in cm.

Is ideal weight the same as healthy weight?

Not exactly. Ideal weight formulas give a single target number, while healthy weight is a range. A BMI of 18.5–24.9 defines a healthy weight range. Use both the ideal weight and BMI calculators together for a more complete picture, and consult a healthcare professional for personalised guidance.