Paediatric Dose by Weight
Children’s medication is dosed by body weight. Paracetamol, for instance, is commonly 10–15 mg/kg per dose with a daily ceiling near 75 mg/kg.
Your numbers
Dose
150mg
Result
450mg
Formula
Dose = Weight (kg) × Dose (mg/kg)
Always follow the prescription and package insert — this tool is for checking a dose, never for setting one.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Weight (kg)The second weight you are comparing against. | 15 | 1 ~ 100 |
| Dose (mg/kg)How much drug is given per kilogram of body weight. | 10 | 0.1 ~ 100 |
| Feeds per dayHow many feeds there are in a day. | 3 | 1 ~ 6 |
Step by step
Quick reference table
Results when only Weight (kg) changes and everything else stays put.
| Weight (kg) | Dose (mg) | Result (mg) |
|---|---|---|
| 7.5 | 75 | 225 |
| 11.3 | 113 | 339 |
| 15 | 150 | 450 |
| 22.5 | 225 | 675 |
| 30 | 300 | 900 |
What each result means
| Result | At default values |
|---|---|
| Dose (mg)How much drug goes in at one time. | 150 |
| Result (mg)What the formula gives back — the answer this page is for. | 450 |
Common mistakes
Always follow the prescription and package insert — this tool is for checking a dose, never for setting one.
Glossary
- Weight (kg)
- The second weight you are comparing against.
- Dose (mg/kg)
- How much drug is given per kilogram of body weight.
- Feeds per day
- How many feeds there are in a day.
- Dose
- How much drug goes in at one time.
- Result
- What the formula gives back — the answer this page is for.
Frequently asked questions
Q. How is Paediatric Dose by Weight calculated?
Dose = Weight (kg) × Dose (mg/kg) — Children’s medication is dosed by body weight. Paracetamol, for instance, is commonly 10–15 mg/kg per dose with a daily ceiling near 75 mg/kg.
Q. Can you walk through an example?
With Weight (kg) 15, Dose (mg/kg) 10, Feeds per day 3, the answer is Dose 150mg.
Q. What do I need to enter?
Enter Weight (kg), Dose (mg/kg), Feeds per day. 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 Weight (kg) moves the answer to Weight (kg) 7.5 → Dose (mg) 75 and Weight (kg) 30 → Dose (mg) 300. 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?
Always follow the prescription and package insert — this tool is for checking a dose, never for setting one.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.