Pediatric Medication Dose Calculator — Tylenol & Motrin
Quick answer: Enter the child's weight in kg and the medication concentration. Get the exact dose in mg and mL.
Calculate the standard weight-based dose of acetaminophen (Tylenol) or ibuprofen (Motrin/Advil) for a child. Uses American Academy of Pediatrics guidelines: 12.5 mg/kg for acetaminophen every 4 hours, 10 mg/kg for ibuprofen every 6 hours. **For reference only — always confirm with your pediatrician.**
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Last reviewed: April 2026Report an error
⚠ Reference only. Always confirm with a pediatrician or pharmacist before giving any medication.
Common: Children's Tylenol = 160 mg/5mL. Children's Motrin = 100 mg/5mL.
Dose
5.3 mL (170 mg)
Give 5.3 mL (170 mg) every 4 hours, max 6 doses per 24 hr (1021 mg max daily). CONFIRM with your pediatrician.
Single dose
5.3 mL
Interval
every 4 hr
Max daily
1021 mg
⚠ This calculator is for educational reference only. Always confirm dosing with a pediatrician.
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How to Use This Pediatric Dose Calculator
- 1Enter the child's weight in kilograms (1 lb = 0.454 kg).
- 2Pick the medication.
- 3Enter the liquid concentration (check the bottle label).
- 4Read the dose in mg and mL.
- 5CONFIRM with your pediatrician before administering.
Frequently Asked Questions
- It is a reference tool, not a medical authority. Drug interactions, allergies, age restrictions, and clinical context matter. Always confirm with a pediatrician or pharmacist before giving medication.
- Ibuprofen can affect kidney function in infants. Acetaminophen is the standard for under-6-months when needed.
- Infant and Children's Tylenol are both 160 mg per 5 mL today. Older "Concentrated Drops" (80 mg per 0.8 mL) were discontinued in 2011 to reduce dosing errors. Always check the label.
- Fever in any infant <3 months, fever >102°F that doesn't respond to medication, or any concerning symptom (lethargy, breathing difficulty, dehydration, rash) requires medical evaluation.
- Pediatricians sometimes recommend it for stubborn fevers. The strict dosing schedule matters — confusion about timing causes most accidental overdoses. Use a written log if alternating.
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