Pediatric Dose By Weight
Calculator

Children vary widely in size at any given age, and drug distribution and clearance relate more closely to body weight (and sometimes body surface area) than to age alone. Weight-based dosing, usually expressed as mg per kilogram, allows more precise and safer dosing across the wide range of sizes seen in pediatric patients.

It multiplies the child's weight in kilograms by the recommended dose per kilogram for a specific medication, as established in pediatric dosing references, to produce a total dose. Some medications also have a maximum dose cap regardless of weight, which should always be checked separately.

Mixing up pounds and kilograms, or misreading a dose as mg per kg per day versus mg per kg per single dose, are common and dangerous sources of medication errors in pediatrics. Always confirm the child's weight is entered in kilograms unless the tool specifically requests pounds, and verify the dosing units match the reference source.

No, standard weight-based dosing calculators assume typical organ function and don't adjust for kidney or liver impairment, which can significantly change how a drug should be dosed. A pediatrician or pharmacist should always review dosing for children with known organ dysfunction or other complicating conditions.

No, this tool is intended as an educational reference and a way to double-check dosing math, not as a substitute for guidance from a pediatrician, pharmacist, or the medication's official prescribing information. Always confirm any dose with a healthcare professional before administering medication to a child.