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Infant Tylenol dosage calculator

Find the right dose of infant or children's Tylenol (acetaminophen) by weight, in mL or tablets for the product you have. Based on the AAP dosing table, with the 24-hour maximum and safety checks.

This is not medical advice

Estimate only. Not medical advice. Check with a doctor or pharmacist before acting on it. Read the full note

These calculators use published population formulas. They do not know your medical history and cannot diagnose, treat or replace a doctor, pharmacist or dietitian. Do not change medication, dosing, eating or drinking decisions on the basis of a number here. If you are pregnant, under 18, over 65, have a health condition or take medication, ask a clinician first. In an emergency call your local emergency number.

Units
kg
months

Dose is by weight; age is used for safety checks.

all US infant and children’s liquids since 2011

Your dose

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AAP dosing table by weight (160 mg / 5 mL liquid)

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WeightDoseLiquid 160 mg/5 mL

When not to give it, or to call first

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Acetaminophen (paracetamol, sold as Tylenol and many store brands) is dosed by weight, not age. Giving too little does nothing for the fever; giving too much, or too often, is the most common cause of accidental overdose in young children. This calculator applies the standard 10–15 mg per kilogram rule, converts it to millilitres or tablets for the product in your hand, and flags the situations where you should call a doctor instead.

How it is calculated

  1. Dose in milligrams = weight in kg × 10 to 15 mg. The main number uses 12.5 mg/kg, the middle of the range. A 9 kg baby: 90–135 mg, about 112 mg.
  2. Volume = milligrams ÷ concentration. All US infant and children’s liquids are 160 mg per 5 mL (32 mg/mL) since the 2011 standardisation, so 112 mg is about 3.5 mL. Liquid doses are rounded to the nearest 0.25 mL, the smallest mark on a syringe.
  3. Repeat no sooner than every 4 hours, no more than 5 doses in 24 hours, and never more than 75 mg/kg in a day.

Checking against the official table

The American Academy of Pediatrics publishes a weight-band table for the 160 mg/5 mL liquid, reproduced below with your child’s band highlighted. The calculated dose and the table dose can differ by a fraction of a millilitre because the table rounds to convenient syringe marks; both are inside the safe range.

Outside the United States

The 160 mg per 5 mL concentration is the US standard. In the UK and much of Europe, infant paracetamol suspension (Calpol and generics) is 120 mg per 5 mL, and the six-plus strength is 250 mg per 5 mL; Australian products vary by brand. The milligram dose by weight is the same everywhere; only the volume changes, so if your bottle says a different concentration, use the milligrams shown here and divide by your label’s mg per mL.

Older concentrated drops

Before 2011, infant drops were 80 mg per 0.8 mL, three times more concentrated than today’s liquid. If you have an old bottle, or one bought outside the US, read the label: the concentration is printed as mg per mL or mg per 5 mL. Only use the 160 mg/5 mL option here if the label says exactly that.

When a fever needs more than medicine

Medicine treats discomfort, not the cause. Call a doctor for any fever under 3 months of age, a fever over 40 °C (104 °F), a fever lasting more than 2–3 days, a child who is unusually drowsy, has a rash, trouble breathing, a stiff neck, or is not drinking. If you think a child has swallowed extra medicine, call Poison Control (1-800-222-1222 in the US) even if they seem fine; acetaminophen overdose has no early symptoms.

Frequently asked questions

How much Tylenol can I give my baby?

10–15 mg per kilogram of body weight every 4–6 hours, maximum 5 doses in 24 hours. For a 6 kg (13 lb) baby that is 60–90 mg, or 2–2.75 mL of the 160 mg/5 mL liquid. Enter the weight above for an exact number.

Can I give Tylenol to a 2-month-old?

Only if a doctor has told you to. Fever in a baby under 3 months needs to be evaluated first, because it can be the only sign of a serious infection.

How often can I give infant Tylenol?

Every 4 to 6 hours as needed, and no more than 5 times in 24 hours. Keep a written log with times; it is easy to lose track at night.

Is infant Tylenol the same as children’s Tylenol?

Yes, since 2011 both are 160 mg per 5 mL in the US. The difference is only the packaging and the syringe. Older infant drops were 80 mg per 0.8 mL and should be discarded.

Can I alternate Tylenol and ibuprofen?

Doctors sometimes recommend it for a stubborn fever in children over 6 months, but it raises the risk of dosing errors. Do not do it on your own; ask your pediatrician for a schedule and write it down.

What if I gave too much?

Call poison control right away (the number for your country is listed under the result), even if your child seems fine. Acetaminophen overdose damages the liver without early symptoms, and the antidote works best in the first hours.

Sources

  1. HealthyChildren.org (AAP): Acetaminophen Dosing Table for Fever and Pain
  2. FDA: Acetaminophen Prescription Combination Drug Products / pediatric OTC liquid standardization to 160 mg/5 mL
  3. Nationwide Children’s Hospital: Acetaminophen Dosage Table

By Calcelate Team. Formula from the sources above.

  1. 2026-09-14 · Formula and texts checked
  2. 2026-09-14 · Reference data as of this date
  3. 2026-09-14 · Emergency numbers verified against official sources