Adjusted Body Weight

Clinical dosing accuracy. Calculate Ideal Body Weight (IBW) and Adjusted Body Weight (ABW) used for medical dosing in overweight individuals.

Adjusted Body Weight (ABW)

81.2

Kilograms

Ideal Weight (IBW)

72.0 kg

Weight excess

+23.0 kg

Why use Adjusted Body Weight?

I genuinely believe that "one size fits all" dosing is dangerous in modern medicine. When a patient is significantly overweight, using their actual weight to calculate medication doses can lead to toxicity, while using their ideal weight can lead to under-dosing. The ABW provides a "middle ground" calculation.

The Formulas Used:

IBW (Devine Formula): 50kg + 2.3kg per inch over 5 feet (Men) / 45.5kg + 2.3kg per inch over 5 feet (Women).
ABW: IBW + 0.4 * (Actual Weight - IBW). The 0.4 factor represents the distribution volume adjustment for obese individuals.

This tool is particularly useful for dosing medications like aminoglycoside antibiotics, which do not distribute well into fat tissue.