Young's Rule — Paediatric Dose by Age

Calculate paediatric drug dose using Young's Rule (paediatric dose = age / (age + 12) × adult dose) as an age-based dosing approximation, noting limitations compared to weight-based approaches.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate paediatric drug dose using Young's Rule (paediatric dose = age / (age + 12) × adult dose) as an age-based dosing approximation, noting limitations compared to weight-based approaches

Each component has a specific meaning:

  • Young's Rule × adult dose) as an age-based dosing approximation — The young's rule × adult dose) as an age-based dosing approximation recorded for the scenario being assessed.
  • Noting limitations compared — The noting limitations compared recorded for the scenario being assessed.

Note: Interpret the young's rule paediatric result against the thresholds and context described above.

How to Use

Enter the Young's Rule × adult dose) as an age-based dosing approximation, noting limitations compared for the scenario you are assessing. Calculate paediatric drug dose using Young's Rule (paediatric dose = age / (age + 12) × adult dose) as an age-based dosing approximation, noting limitations compared to weight-based approaches. Use the young's rule paediatric result to inform your calculation.

Frequently Asked Questions