Ideal Weight Calculator
Calculate your ideal body weight using 5 different formulas: Robinson, Miller, Devine, Hamwi, and BMI-based. See also BMI Calculator and Body Fat Calculator.
How to Calculate Ideal Body Weight
Ideal body weight (IBW) is an estimated weight considered healthiest for a person based on their height and gender. Multiple formulas exist because there is no single perfect method. This calculator uses five well-known formulas and averages them for a balanced estimate. All formulas use height as the primary input, with adjustments for gender differences in body composition.
Ideal Weight Formulas
Devine Formula (1974)
Male: IBW = 50 + 2.3 × (height in inches − 60)
Female: IBW = 45.5 + 2.3 × (height in inches − 60)
Robinson Formula (1983)
Male: IBW = 52 + 1.9 × (height in inches − 60)
Female: IBW = 49 + 1.7 × (height in inches − 60)
Miller Formula (1983)
Male: IBW = 56.2 + 1.41 × (height in inches − 60)
Female: IBW = 53.1 + 1.36 × (height in inches − 60)
Example (Male, 5'9" / 175 cm)
Height = 69 inches, inches over 5ft = 9
Devine: 50 + 2.3 × 9 = 70.7 kg (155.9 lbs)
Robinson: 52 + 1.9 × 9 = 69.1 kg (152.3 lbs)
Miller: 56.2 + 1.41 × 9 = 68.9 kg (151.9 lbs)
Ideal Weight by Height Table
| Height | Male (kg) | Female (kg) |
|---|---|---|
| 5'0" (152 cm) | 50.0 – 57.0 | 45.5 – 53.1 |
| 5'2" (157 cm) | 54.6 – 59.8 | 50.1 – 55.8 |
| 5'4" (163 cm) | 59.2 – 62.6 | 54.7 – 58.5 |
| 5'6" (168 cm) | 63.8 – 65.4 | 59.3 – 61.2 |
| 5'8" (173 cm) | 68.4 – 68.2 | 63.9 – 63.9 |
| 5'10" (178 cm) | 73.0 – 71.0 | 68.5 – 66.6 |
| 6'0" (183 cm) | 77.6 – 73.8 | 73.1 – 69.3 |
| 6'2" (188 cm) | 82.2 – 76.6 | 77.7 – 72.0 |
Frequently Asked Questions
Which ideal weight formula is most accurate?
No single formula is universally best. The Devine formula is most widely used in clinical settings. The Robinson and Miller formulas are considered more modern refinements. Using the average of multiple formulas gives the most balanced estimate.
Does ideal weight account for body composition?
No. These formulas only use height and gender. They do not account for muscle mass, bone density, age, or body frame size. A muscular person may weigh more than their "ideal weight" while being perfectly healthy.
Is ideal weight the same as healthy weight?
Not exactly. Ideal weight formulas give a single target, while healthy weight is a range. The BMI-based healthy range (18.5–24.9) is generally more useful for assessing whether your weight is in a healthy zone.