Children's Medicine Dosage Calculators

KinToolkit provides educational children's medicine dosage calculators for Tylenol (acetaminophen), Motrin (ibuprofen), and Zyrtec (cetirizine). Always verify the product concentration and consult a healthcare professional.

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Choose a medicine and match your bottle

Choose the active ingredient, then match the concentration on your own bottle. The tool uses predefined label ranges; it does not calculate a personalized prescription.

How do I use these calculators?

Match your bottle, choose the weight or age range offered for that product, and read the label directions and warnings. If your bottle or range is not listed, ask a pharmacist or your child’s doctor.

Supported bottles

US liquid products supported by this calculator
BottleIngredientStrengthUses
Children’s TYLENOLAcetaminophen160 mg / 5 mLWeight or age
Infants’ TYLENOLAcetaminophen160 mg / 5 mLWeight or age
Children’s MOTRINIbuprofen100 mg / 5 mLWeight or age
Infants’ MOTRINIbuprofen50 mg / 1.25 mLWeight or age
Children’s ZYRTECCetirizine HCl1 mg / mLAge

US liquid products shown here only. Do not apply these amounts to another strength, formulation or country’s product. Use the measuring device supplied with your bottle and read the full label; this page does not reproduce every warning.

What is the difference between a brand name and an ingredient name?

For the bottles shown here, Tylenol contains acetaminophen, Motrin contains ibuprofen, and Zyrtec contains cetirizine. The brand is the product name; the active ingredient appears in Drug Facts. Match the full product and concentration, not just a familiar name.

Can I use an Equate, CVS Health, or Walgreens bottle?

Only bottles listed in the interactive selector are supported there. For other brands, check the exact product’s Drug Facts for its active ingredient, concentration, directions and age limits. Do not select a pictured bottle just because its ingredient matches.

Store-brand label references

Find the label for your exact store-brand product below. These are label references, not additional bottles in the guided questions. Use that flow only for bottles shown in its selector. Read your own package’s Drug Facts before use.

Published labels checked September 25, 2026. Product names, flavors and package codes identify the specific labels reviewed; other versions may differ.

Keep another caregiver in the loop

Share this calculator so they can match their own bottle. The link contains no child details or dosage results.

How KinToolkit prepares this information

KinToolkit organizes the selected US liquid medicine labels into bottle-matching tools and reference tables. The calculator and these tables use the same range lookup, not a continuous weight formula. Manufacturer labels are the primary sources; this summary does not establish an independently validated or clinically reviewed dosing protocol.

Label sources checked: . This is a source-check date, not a clinical-review date.

Before using label directions

Verify the active ingredient, concentration and warnings on your own package. KinToolkit is an independent educational tool, not a medical professional or a substitute for your child’s clinician. The brands mentioned above are not affiliated with KinToolkit.

Sources and accessible text

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