Children’s medicine doses, by weight
Pediatric dose calculator
Find the right amount of Tylenol, Motrin, Benadryl or Zyrtec for your child in mL, based on published dosing tables from the AAP and children’s hospitals.
Dose calculator
Prescription medicines have their own calculators: amoxicillin, Tamiflu. Also: MiraLAX, alternating Tylenol and Motrin.
Dosage charts by medicine
Fever and pain
Allergies and itching
- BenadryldiphenhydramineAllergic reactions, hives and itching
- ZyrteccetirizineSeasonal allergies, hives and itching
- ClaritinloratadineSeasonal allergies, hives and itching
- AllegrafexofenadineSeasonal allergies and hives
Stomach and bowels
Sleep
Antibiotics (prescription)
Flu (prescription)
Three rules for dosing children’s medicine
Dose by weight
Age is a rough guide. Weight is what dose tables are built on, so use a recent weight whenever you have one.
Measure in mL with a syringe
Oral syringes are the most accurate. Kitchen spoons aren’t. How to measure.
Know the limits
Every medicine has a minimum age and a maximum number of doses a day. The calculator shows both and stops when a doctor is needed.
Common questions
How do I calculate my child’s medicine dose?
Enter your child’s weight and age above and choose the medicine. The calculator finds the matching row in the published dose table and shows the amount for every product strength, how often to give it, and the 24-hour limit.
Why does the dose depend on weight instead of age?
Children the same age can differ in weight by 10 lb or more. Pediatric dose tables are built on weight, and age is only a stand-in for when you don’t know the weight.
Where do these doses come from?
From published dosing tables by the American Academy of Pediatrics, St. Louis Children’s Hospital, the CDC, and the FDA label for each medicine. Every page lists its sources. See all sources.
Is this calculator for doctors or parents?
Both, but it’s written for parents and caregivers of healthy children. Clinicians should verify doses against their own formulary.