Pediatric Dosage Calculator
This pediatric dosage calculator applies weight-based (mg/kg) dosing to find the per-dose and daily amount for a child, converts it to a liquid volume using the concentration, and caps the dose at the adult maximum when one is entered.
Calculator
LiveEducational tool, not medical advice. Verify every dose against the prescription and your institutional protocol — a licensed clinician is responsible for the final dose.
Enter values to see your result.
How to Use the Calculator
- Enter the child weight in kilograms.
- Enter the dose in mg/kg and the number of doses per day.
- Optionally enter the liquid concentration to get a volume in mL.
- Optionally enter the adult maximum to cap the per-dose amount.
What the Result Means
The per-dose is the amount to give each time; the daily total is the per-dose multiplied by the frequency. If a liquid concentration is provided, the volume in mL is what you measure. Always verify against a current pediatric reference and the product label.
When to Use This Calculator
- Weight-based pediatric prescribing
- Converting a pediatric dose to a liquid volume (mL)
- Checking a dose against the adult maximum
Frequently Asked Questions
How do I calculate a mg/kg dose for a child?
Multiply the child weight in kilograms by the prescribed mg/kg per dose. Multiply by the number of doses per day for the total daily amount. Always confirm against a current pediatric reference.
How do I convert a pediatric dose to mL?
Divide the per-dose amount in mg by the liquid concentration in mg/mL. For example, a 120 mg dose of a 160 mg/5 mL (32 mg/mL) suspension is 120 ÷ 32 = 3.75 mL.
Why is the dose capped at the adult maximum?
For heavier children, the weight-based dose can exceed the usual adult dose. Many drugs have an absolute per-dose ceiling, so the calculator caps the result at the adult maximum you enter and flags it for verification.
References & Guidelines
- AAP / pediatric dosing references (e.g., Lexicomp Pediatric).