Adjusted Body Weight Calculator

How to Calculate Adjusted Body Weight

Adjusted Body Weight (AjBW) is a concept used in medical settings, particularly for dosing medications in overweight or obese patients. It provides a more accurate estimation of lean body mass compared to actual body weight. Here's a comprehensive guide on how to calculate AjBW.

Adjusted Body Weight Formula

The formula to calculate Adjusted Body Weight is:

$$AjBW = IBW + 0.4 \times (ABW - IBW)$$

Where:

• $$AjBW$$ is the Adjusted Body Weight
• $$IBW$$ is the Ideal Body Weight
• $$ABW$$ is the Actual Body Weight

Calculation Steps

1. Calculate the Ideal Body Weight (IBW)
2. Determine the difference between Actual Body Weight and Ideal Body Weight
3. Multiply this difference by 0.4
4. Add the result to the Ideal Body Weight

Example Calculation

Let's calculate the Adjusted Body Weight for a male patient with the following details:

• Height: 180 cm (70.87 inches)
• Actual Body Weight: 100 kg

Step 1: Calculate Ideal Body Weight (IBW)

For males: $$IBW = 50 + 2.3 \times (\text{height in inches} - 60)$$

$$IBW = 50 + 2.3 \times (70.87 - 60) = 75 \text{ kg}$$

Step 2: Calculate Adjusted Body Weight (AjBW)

$$AjBW = IBW + 0.4 \times (ABW - IBW)$$

$$AjBW = 75 + 0.4 \times (100 - 75) = 85 \text{ kg}$$

Step 3: Final Results

• Ideal Body Weight (IBW): 75 kg
• Adjusted Body Weight (AjBW): 85 kg

Visual Representation

This bar chart illustrates the relationship between Actual Body Weight, Ideal Body Weight, and Adjusted Body Weight in our example calculation.