Child Syrup Dose Calculator
Work out the millilitres of syrup a child needs from their weight and the label dose, capped at the adult maximum.
Recent
Formula
How the calculation works
The calculator multiplies the child's weight in kilograms by the milligrams per kilogram on the label.
It divides that total milligrams by the syrup concentration in milligrams per millilitre to get the dose in millilitres.
The dose is then capped at the adult maximum, so it never exceeds the highest safe single dose.
Common mistakes
- Reading the concentration as milligrams per teaspoon instead of per millilitre, which can triple the dose.
- Guessing the weight instead of using a recent measurement, since the dose changes directly with the child's weight.
When to use it
- Use it to check a prescriber's syrup dose against the child's weight before you measure the first spoonful.
- Use it to see the moment a heavier child's dose reaches the adult cap and no longer rises with weight.
Worked example
A 15 kg child at 10 mg per kg with a 50 mg per ml syrup needs doseMl = 15 x 10 / 50 = 3 ml, which is under the 10 ml adult cap.
Common questions
Why is the syrup dose capped at an adult maximum?
Above the adult maximum, a larger dose adds side effects without extra benefit, so the cap keeps a heavier child within the safe limit.
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