Pediatric Dosage Rules/ Learn
Amie Bedgood, Austin Community College

Clark's Rule

Clark's Rule is a medical term referring to a procedure used to calculate the amount of medicine to give to a child aged 2-17. The procedure is to take the child's weight in pounds, divide by 150lbs, and multiply the fractional result by the adult dose to find the equivalent child dosage.

For example: If an adult dose of medication calls for 30mg and the child weighs 30lbs. Divide the weight by 150 (30/150) to get 1/5. Multiply 1/5 times 30mg to get 6mg.

Clark's Rule is not used clinically, but it is a popular dosage calculation formula for pediatric nursing instructors.

( wikipedia definition)


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