Pediatric Dose Calculator — Weight-Based Dosing
Calculate a weight-based pediatric medication dose from the child’s weight and the mg/kg rate. Choose per-dose or per-day dosing, add a concentration to get the volume to draw up, and set a maximum single dose.
Prescription
For reference and education only — always verify against local protocols and a clinician’s review. Calculated locally in your browser.
How weight-based dosing works
Most pediatric medicines are dosed by body weight. The dose is the child’s weight in kilograms multiplied by a drug-specific rate in mg/kg. Rates may be written per dose or per day — always confirm which the reference intends, then divide a daily total by the number of doses.
Worked example
A 12 kg child prescribed amoxicillin 15 mg/kg/dose, three times a day: 12 × 15 = 180 mg per dose(540 mg/day). With a 250 mg/5 mL (50 mg/mL) suspension, that is 180 ÷ 50 = 3.6 mL per dose.
Frequently asked questions
How is a weight-based pediatric dose calculated?+
Multiply the child’s weight in kilograms by the prescribed dose in mg/kg. For example, 12 kg × 15 mg/kg = 180 mg per dose. If the rate is expressed per day, divide the daily total by the number of doses to get each dose.
What is the difference between mg/kg/dose and mg/kg/day?+
mg/kg/dose is the amount for a single administration; mg/kg/day is the total for 24 hours, split across the daily frequency. This calculator lets you choose either basis so the maths is correct.
How do I convert a dose to a liquid volume?+
Divide the dose (mg) by the syrup/suspension concentration (mg/mL). Enter the concentration and the tool shows the millilitres to draw up.
Does it apply a maximum dose?+
Yes — enter an optional maximum single dose and the calculator caps the result (commonly the adult dose), which is important for heavier children.
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