Ideal Body Weight Calculator — Devine Formula
Ideal Body Weight
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Formula Used
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In Kilograms
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How to Calculate Ideal Body Weight
The Devine formula (1974) is the most widely used method for calculating ideal body weight (IBW) in clinical settings. For males: IBW = 50 kg + 2.3 kg per inch over 5 feet. For females: IBW = 45.5 kg + 2.3 kg per inch over 5 feet.
IBW is primarily used in medicine for drug dosing, tidal volume calculations in mechanical ventilation, and nutritional assessments. It provides a target weight based on height and gender, independent of actual body composition.
Note that IBW does not account for muscle mass, frame size, or ethnic variations. It should be used as a clinical reference rather than a personal weight goal. For comprehensive health assessment, combine IBW with BMI, body fat percentage, and waist circumference.
Frequently Asked Questions
What is the Devine formula?
The Devine formula calculates ideal body weight as: Males = 50 + 2.3 x (inches over 60), Females = 45.5 + 2.3 x (inches over 60). It was originally developed for drug dosing calculations.
Is IBW the same as healthy weight?
Not exactly. IBW is a clinical reference for medication dosing and ventilator settings. A healthy weight range (BMI 18.5-25) may differ from IBW. IBW does not account for body composition or frame size.
What if I am shorter than 5 feet?
The Devine formula is designed for heights of 5 feet and above. For shorter individuals, other formulas or clinical judgment should be used, as the Devine formula may underestimate ideal weight.