Adjusted Body Weight: A Middle Figure Explained
Adjusted weight is neither ideal nor actual weight. This guide explains the 40 percent formula and where the figure is used.
What is the Adjusted Body Weight Calculator?
Adjusted body weight sits part-way between ideal and actual weight and is often used in dosing estimates. This tool takes 40 percent of the gap between the two and adds it to the ideal weight. Enter both weights and the adjusted figure appears at once. This is an estimate for general use, not a dosing instruction — check with a clinician for any medical use.
How to use it
- Enter your actual weight in kilograms.
- Enter the ideal weight in kilograms.
- Click Calculate Adjusted Weight.
Worked example
Actual 100 kg and ideal 65 kg give an adjusted weight of 79 kg, since 65 plus 40 percent of 35 is 79.
When is adjusted weight used?
It is commonly used as an estimating input for drug dosing and similar calculations, but any real dosing decision belongs to a clinician.
Frequently asked questions
Why 40 percent?
The common convention takes 40 percent of the excess over ideal weight, giving a figure between ideal and actual.
What if actual weight is below ideal?
The formula still works, but adjusted weight is mainly meant for cases where actual weight is well above ideal.