Young's Rule can be expressed with the following formula: \[ \text{Child's Dose} = \left( \frac{\text{Age in years}}{\text{Age in years} + 12} \right) \times \text{Adult Dose} \]
For instance, if an 8-year-old child needs a medication that has an adult dose of 100 mg, the calculation would be: \[ \text{Child's Dose} = \left( \frac{8}{8 + 12} \right) \times 100 = 40 \, \text{mg} \]
