Adjusted Body Weight Calculator
IBW and adjusted weight for dosing.
Enter your values
Enter the height in inches.
Choose one of: Male, Female.
Enter the actual weight in kg.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Adjusted body weight
- 87.8 kg
- Ideal body weight
- 73 kg
- Actual body weight
- 110 kg
- Percent over IBW
- 50.68%
- Lean estimate
- 87.8 kg
Quick answer
Adjusted body weight is ideal body weight plus 40% of the excess over ideal, used when actual weight overestimates dose.
AdjBW = IBW + 0.4 × (ABW − IBW)
At a glance
| What it does | IBW and adjusted weight for dosing. |
|---|---|
| Category | Health |
| Inputs needed | Height, Sex, Actual weight |
| Main output | Adjusted body weight |
| Formula | AdjBW = IBW + 0.4 × (ABW − IBW) |
| Cost | Free — no sign-up, no download |
How to use the Adjusted Body Weight Calculator
- 1Enter height in inches.
- 2Select sex for the Devine formula.
- 3Enter actual body weight in kilograms.
Inputs explained
- Height(inches)
- Enter the height in inches.
- Sex
- Choose one of: Male, Female.
- Actual weight(kg)
- Enter the actual weight in kg.
Worked example
Using the values the calculator loads with:
Inputs
- Height70 inches
- SexMale
- Actual weight110 kg
Results
- Adjusted body weight87.8 kg
- Ideal body weight73 kg
- Actual body weight110 kg
- Percent over IBW50.68%
- Lean estimate87.8 kg
Frequently asked questions
When is adjusted weight used?
For aminoglycosides and some chemotherapy dosing in obesity.
Which formula is this?
Devine ideal body weight with the standard 0.4 correction factor.
What do I need to enter into the Adjusted Body Weight Calculator?
Just 3 values: height, sex, actual weight. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Adjusted Body Weight Calculator work out the answer?
Adjusted body weight is ideal body weight plus 40% of the excess over ideal, used when actual weight overestimates dose. It applies the formula AdjBW = IBW + 0.4 × (ABW − IBW) and shows the working so you can check each step by hand.
Is the Adjusted Body Weight Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.