Pediatric Dose Calculator – Guide & Formulas
Calculate safe weight-based medication dosages (liquid suspensions) for children, including acetaminophen and ibuprofen.
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Put these formulas into practice with our instant, step-by-step Pediatric Dose Calculator.
Pediatric medication must always be measured precisely by a child's weight rather than their age, because metabolic rate and body water distribution vary drastically in growing bodies. This Pediatric Dose Calculator estimates safe dosage ranges for common over-the-counter pediatric medications like Acetaminophen (Tylenol) and Ibuprofen (Advil/Motrin) based on clinical pediatric weight-based protocols.
Key Takeaway
Use the free Pediatric Dose Calculator to calculate safe weight-based medication dosages (liquid suspensions) for children, including acetaminophen and ibuprofen. Get instant results with step-by-step explanations.
How to Use the Pediatric Dose Calculator
- Select the active drug type (Acetaminophen or Ibuprofen).
- Enter the child's weight in pounds or kilograms.
- Specify the concentration of the liquid medication (e.g., 160 mg per 5 mL).
- Examine the recommended single dose in milligrams (mg) and the precise liquid volume in milliliters (mL).
The Formula
Variable Definitions
- Target Dose (mg/kg): Clinical standard dose per kg body weight (15 mg/kg for acetaminophen, 10 mg/kg for ibuprofen)
- Concentration (mg/mL): The strength of the drug liquid formulation as labeled on the bottle
Calculating Children's Ibuprofen Dose
A mother needs to give Ibuprofen to her 24 lb child. The bottle concentration is 100 mg / 5 mL.
- Step 1: Convert weight to kg: 24 lbs / 2.20462 ≈ 10.89 kg.
- Step 2: Apply pediatric ibuprofen standard: 10 mg/kg.
- Step 3: Calculate required mg: 10.89 kg * 10 mg/kg = 108.9 mg.
- Step 4: Determine liquid concentration: 100 mg / 5 mL = 20 mg/mL.
- Step 5: Divide to find liquid volume: 108.9 mg / 20 mg/mL ≈ 5.4 mL.