Young's Rule Calculator (Educational & Exam Reference)
Estimates paediatric dose for children aged 1–12 years using age in years for academic/GPAT examination preparation.
⚠️ Educational Calculation & Clinical Safety Safeguard: EDUCATIONAL / HISTORICAL FORMULA ONLY: Age-based formulas ignore growth variation; clinical dosing must use verified weight/BSA guidelines. Educational calculations do not replace clinician assessment, patient-specific laboratory monitoring, or institutional prescribing protocols.
Interactive Calculator
Allowed physiological/compounding range: 1 to 12 years
Allowed physiological/compounding range: 1 to 5000 mg
Calculated Output (mg)
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Step-by-Step Mathematical Derivation & Explanation:
Validated Formula & Conversion Rules
Young's Rule: Child Dose = [Age (years) / (Age + 12)] × Adult DoseWorked Clinical Example
6-year-old child, Adult Dose 600 mg: Child Dose = [6 / (6 + 12)] × 600 = (6 / 18) × 600 = 200 mg.
Rounding Rules, Assumptions & Source References
- Rounding Rule: Express exact fraction in academic calculations and round to 2 decimal places.
- Clinical Assumptions & Limitations: Validated only within the stated physiological input boundaries. For paediatric, renal (Cockcroft-Gault), and critical-care infusion calculations, always cross-check against official product labelling and institutional guidelines.
- Source References: Indian Pharmacopoeia (IP 2022), National Formulary of India (NFI), British National Formulary (BNF), and NCBI Bookshelf Clinical Pharmacology Compendia.