Fried's Rule Calculator (Educational Infant Reference)
Estimates infant dose (<24 months) from age in months and adult dose for academic/GPAT examination preparation.
⚠️ Educational Calculation & Clinical Safety Safeguard: EDUCATIONAL / HISTORICAL FORMULA ONLY: Neonates and infants have immature renal/hepatic clearance; never use Fried's rule for clinical prescribing. Educational calculations do not replace clinician assessment, patient-specific laboratory monitoring, or institutional prescribing protocols.
Interactive Calculator
Allowed physiological/compounding range: 1 to 24 months
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
Fried's Rule: Infant Dose = [Age (months) / 150] × Adult DoseWorked Clinical Example
10-month-old infant, Adult Dose 300 mg: Infant Dose = (10 / 150) × 300 = 20 mg.
Rounding Rules, Clinical Interpretation, Assumptions & Known Limitations
- 1. Purpose: Estimates infant dose (<24 months) from age in months and adult dose for academic/GPAT examination preparation.
- 2. Required Inputs & Validated Units: Infant Age (months, range 1–24), Standard Adult Dose (mg, range 1–5000)
- 3. Output Unit:
mg - 4. Result Interpretation Notes: Academic and GPAT examination reference for Fried's Rule (Age in months / 150 × Adult Dose).
- 5. Rounding Guidance: Round to 2 decimal places for examination questions.
- 6. Mathematical & Clinical Assumptions: Historical infant posology formula for infants under 24 months.
- 7. Known Limitations & Contraindications to Formula Use: Strictly for academic pharmacy exam preparation; never use Fried's Rule for real-world neonatal or infant prescribing.
- 8. Supporting Compendial & Clinical References: Indian Pharmacopoeia (IP 2022), National Formulary of India (NFI), British National Formulary (BNF), and NCBI Bookshelf Clinical Pharmacology Compendia.