About this calculator
This pediatric acetaminophen calculator estimates a dose range from your child's weight and the liquid concentration on the medication label. It is designed for education and dose-checking only. It does not replace your child's clinician, pharmacist, product label, or local poison control service.
Acetaminophen dosing mistakes can cause serious liver injury. Always use a proper oral syringe or the dosing device that came with the product, and never use a kitchen spoon.
Uses the common pediatric oral acetaminophen dose range of 10–15 mg/kg/dose for educational calculation, with label-based safeguards: use the product's measured concentration, repeat no more often than directed, avoid more than 5 doses in 24 hours, and do not combine with other acetaminophen-containing medicines.
Formula active with medication-safety guardrails
Pediatric dosing depends on exact weight, age, concentration, route, and total daily acetaminophen from all products.
Formula and method
Dose range per dose = weight in kg × 10–15 mg/kg. Liquid volume = dose in mg ÷ concentration in mg per 5 mL × 5. The result also displays a daily ceiling based on 5 doses and 75 mg/kg/day, but caregivers should follow the product label or clinician instructions when stricter.
Limitations and when not to rely on this result
- Pediatric dosing depends on exact weight, age, concentration, route, and total daily acetaminophen from all products.
- Do not use this page for infants under 12 weeks, overdose concerns, liver disease, repeated vomiting, or unclear product strength without clinician or pharmacist advice.
- Always follow the product label, prescription instructions, poison-control guidance, or local pediatric protocol when they differ.
Frequently asked questions
How does this calculator estimate a pediatric acetaminophen dose? +
It converts the child's weight to kilograms, calculates 10–15 mg/kg for one oral dose, then converts that milligram range into mL using the liquid concentration you enter from the bottle label.
Can I use this for a baby under 2 years old? +
Use extra caution. AAP guidance says acetaminophen should not be given to children under 2 years without doctor guidance, and fever in the first 12 weeks needs medical attention.
How often can acetaminophen be given? +
Many pediatric labels and AAP guidance use every 4 hours while symptoms last and no more than 5 doses in 24 hours for children under 12. Follow your product label or clinician instructions when stricter.
What if my bottle is not 160 mg per 5 mL? +
Enter the exact concentration printed on your label. If you are unsure, do not guess; ask a pharmacist or clinician before giving a dose.
What should I do if I may have given too much acetaminophen? +
Contact Poison Control or emergency services right away. Serious overdose can occur even before symptoms are obvious.