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Formula
Calculates safe medication doses for children using established clinical rules.
Worked Example
Pediatric Dosing Rules
- Clark's Rule: Dose = (Weight in kg / 70) × Adult Dose OR (Weight in lbs / 150) × Adult Dose
- Young's Rule: Dose = [Age / (Age + 12)] × Adult Dose (typically for ages 1-12)
- Modern practice prefers precise mg/kg or mg/m² dosing for most medications
- Always verify pediatric doses with a pharmacist or specialist reference (e.g., Harriet Lane)
This tool provides a mathematical estimate. Pediatric medications must be prescribed by a qualified healthcare professional who considers the child's full clinical picture.
You can also calculate changes using our Corrected Age Calculator or IV Drip Rate Calculator.
Frequently Asked Questions
What is Clark's Rule?
Clark's Rule is a medical formula used to estimate a child's dose of medication based on their weight compared to an average adult weight of 70kg (or 150lbs).
When is Young's Rule used?
Young's Rule uses a child's age to estimate medication dosage. It is generally considered less accurate than weight-based methods because children's weights vary significantly at the same age.
Can I use this for all medications?
No. Many medications (like antibiotics or chemo) have very specific mg/kg dosing that cannot be estimated by these general rules.
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