Pediatric Dosing Calculator
Weight-based pediatric dosing with Lexicomp / Micromedex cross-check. Supports mg/kg, mcg/kg, and per-day or per-dose regimens.
Calculate pediatric doses using weight-based dosing, Clark's rule, or Young's rule.
Formula
Dose = Weight (kg) × Dose per kg, divided by the prescribed frequency
Always check against age-band labeling and maximum dose. Use ideal body weight for obese pediatric patients. Clark's rule: child dose = (weight in lb ÷ 150) × adult dose.
Step-by-step method
- 1
Find the FDA / Lexicomp pediatric entry
Look up the drug in the FDA label or Lexicomp / Micromedex pediatric module and identify the dose for the child's age band and indication.
- 2
Confirm the child's weight
Use the most recent recorded weight in kg. Convert pounds → kg if needed (1 lb = 0.4536 kg).
- 3
Multiply weight by dose per kg
Dose per administration = Weight × Dose per kg.
- 4
Apply the maximum cap
Compare against the labeled maximum daily and per-dose limits — do not exceed adult dose.
- 5
Round to a measurable volume
Round to a volume that can be measured accurately with the supplied oral syringe.
Worked example
Scenario: Amoxicillin 25 mg/kg PO q8h for an 18 kg child.
Answer: 18 × 25 = 450 mg q8h; 1350 mg total daily.
Practice calculations for the NAPLEX
350+ exam-style calculation questions with detailed explanations, mapped to NABP NAPLEX competency Area 4 (Perform Calculations).