Ideal Weight Calculator
Calculate your ideal body weight using proven medical formulas
Ideal Weight Calculator
The Ideal Weight Calculator computes ideal body weight (IBW) ranges based on height, gender, and age. The idea of finding the IBW using a formula has been sought after by many experts for a long time. Currently, there persist several popular formulas, and our Ideal Weight Calculator provides their results for side-to-side comparisons.
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The ideal weight based on popular formulas:
| Formula | Ideal Weight |
|---|---|
| Robinson (1983) | 72.6 kg |
| Miller (1983) | 71.5 kg |
| Devine (1974) | 75.0 kg |
| Hamwi (1964) | 77.3 kg |
| Healthy BMI Range | 59.9 - 81.0 kg |
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What is IBW?
Ideal Body Weight (IBW) was initially introduced to estimate dosages for medical use. The formulas calculate IBW are not related to how a person looks at a given weight, but rather for medical and dosage purposes.
IBW Limitations
IBW is not a perfect measurement. It doesn't consider body fat percentage, muscle mass, or body composition. Highly fit athletes may be considered overweight based on IBW despite being healthy.
Health Considerations
IBW should be considered with other health indicators. It's more important to make healthy life choices than to chase a specific weight based on a generalized formula.
Factors Affecting Ideal Weight
Age
Age shouldn't be a large determinant of IBW past adolescence. However, as people age, lean muscle mass decreases and it's easier to accumulate body fat.
Gender
Generally, females weigh less than males despite having a higher percentage of body fat. Males typically have higher muscle mass and bone density.
Height
Taller people have more muscle mass and body fat, resulting in more weight. A male at similar height to a female should weigh about 10-20% more.
Body Frame Size
Body frame size significantly impacts ideal weight. It's categorized as small, medium, or large based on wrist circumference relative to height.
Ideal Weight Formulas
IBW formulas were developed mainly to facilitate drug dosage calculations. All formulas have the same format: a base weight given a height of 5 feet with a set weight increment added per inch over 5 feet.
G. J. Hamwi Formula (1964)
Male: 48.0 kg + 2.7 kg per inch over 5 feet
Female: 45.5 kg + 2.2 kg per inch over 5 feet
Invented for medicinal dosage purposes.
B. J. Devine Formula (1974)
Male: 50.0 kg + 2.3 kg per inch over 5 feet
Female: 45.5 kg + 2.3 kg per inch over 5 feet
Most widely used formula for IBW measurement.
J. D. Robinson Formula (1983)
Male: 52 kg + 1.9 kg per inch over 5 feet
Female: 49 kg + 1.7 kg per inch over 5 feet
Modification of the Devine Formula.
D. R. Miller Formula (1983)
Male: 56.2 kg + 1.41 kg per inch over 5 feet
Female: 53.1 kg + 1.36 kg per inch over 5 feet
Modification of the Devine Formula.
Healthy BMI Range
The World Health Organization's recommended healthy BMI range is 18.5 - 25 for both males and females. Based on this range, it's possible to find a healthy weight for any given height.