Adjusted Body Weight
Because drugs distribute partly into fat tissue, dosing uses ideal weight plus 40% of the excess. Using actual weight can overdose.
Your numbers
Result
74.8kg
Ideal weight
61.3kg
Formula
Result = Ideal weight + 0.4 × (Weight (kg) − Ideal weight)
It is typically applied above about 130% of ideal weight, and the right weight metric differs by drug — follow the prescription.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Height (cm)Height in centimetres; converted to metres inside the formula. | 165 | 100 ~ 250 |
| Weight (kg)The second weight you are comparing against. | 95 | 10 ~ 300 |
| Sex (M1 / F0)Where the formula splits by sex — enter 1 for male, 0 for female. | 1 | 0 ~ 1 |
Step by step
Quick reference table
Results when only Height (cm) changes and everything else stays put.
| Height (cm) | Result (kg) | Ideal weight (kg) |
|---|---|---|
| 100 | 39.7 | 2.8 |
| 124 | 52.7 | 24.4 |
| 165 | 74.8 | 61.3 |
| 248 | 119.6 | 136 |
| 250 | 120.7 | 137.8 |
What each result means
| Result | At default values |
|---|---|
| Result (kg)What the formula gives back — the answer this page is for. | 74.8 |
| Ideal weight (kg)A reference weight from height alone — a benchmark, not a goal. | 61.3 |
Common mistakes
It is typically applied above about 130% of ideal weight, and the right weight metric differs by drug — follow the prescription.
Glossary
- Height (cm)
- Height in centimetres; converted to metres inside the formula.
- Weight (kg)
- The second weight you are comparing against.
- Sex (M1 / F0)
- Where the formula splits by sex — enter 1 for male, 0 for female.
- Result
- What the formula gives back — the answer this page is for.
- Ideal weight
- A reference weight from height alone — a benchmark, not a goal.
Frequently asked questions
Q. How is Adjusted Body Weight calculated?
Result = Ideal weight + 0.4 × (Weight (kg) − Ideal weight) — Because drugs distribute partly into fat tissue, dosing uses ideal weight plus 40% of the excess. Using actual weight can overdose.
Q. Can you walk through an example?
With Height (cm) 165, Weight (kg) 95, Sex (M1 / F0) 1, the answer is Result 74.8kg.
Q. What do I need to enter?
Enter Height (cm), Weight (kg), Sex (M1 / F0). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Height (cm) moves the answer to Height (cm) 100 → Result (kg) 39.7 and Height (cm) 250 → Result (kg) 120.7. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
It is typically applied above about 130% of ideal weight, and the right weight metric differs by drug — follow the prescription.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.