Medicine Dose Calculator for Children
Calculates a child's total daily dose in milligrams from body weight and the dose per kilogram, then splits it into the amount for each administration.
Recent
Formula
How the calculation works
Enter the child's weight in kilograms, which is the value doctors use when they prescribe by mg/kg rather than by age.
Enter the dose per kilogram from the prescription and the number of times the medicine is given each day.
The tool multiplies weight by dose per kilogram to get the daily total in milligrams, then divides by the number of doses to get each single dose.
Common mistakes
- Mixing up the daily total and the single dose, so giving the whole daily figure at once instead of dividing it across the day's doses.
- Guessing the weight instead of using a recent measurement, because dose scales directly with weight and a rough figure shifts the milligrams.
When to use it
- Use it to double-check a prescribed mg/kg dose before measuring liquid medicine, so a decimal slip does not turn into an overdose.
- Use it when a prescription gives only the per-kilogram dose and you need the actual milligrams for each feed or dose.
Worked example
For a 20 kg child with a dose of 15 mg/kg given 3 times a day, the daily total is 300 mg and each dose is 100 mg.
Common questions
Does this tell me how many millilitres to give?
No, it gives milligrams, and you must convert to millilitres using the concentration on the bottle label, which states how many mg are in each ml.
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