Pediatric Dosage Calculator
Calculate safe pediatric medication doses using weight-based and body surface area (BSA) methods with age-appropriate safety ranges.
CRITICAL MEDICAL DISCLAIMER - PEDIATRIC USE
This calculator is for educational and reference purposes only. Pediatric dosing errors can be fatal. All calculations must be independently verified by a licensed healthcare professional, pharmacist, or physician before administration. Always consult age-appropriate formularies, verify maximum dose limits, and consider the child's age, organ function, and clinical condition. Never rely solely on this tool for patient care.
What This Calculator Does
This pediatric dosage calculator computes safe medication doses for children using weight-based (mg/kg) dosing and body surface area (BSA) methods. It calculates the single dose, total daily dose, liquid volume per dose, and BSA using the Mosteller formula. An optional maximum single dose cap prevents calculations from exceeding safe thresholds for pediatric patients.
The Formula
Weight-based dosing multiplies the prescribed mg/kg by the child weight in kilograms. The Mosteller BSA formula calculates body surface area in square meters from height (cm) and weight (kg). BSA dosing is used for chemotherapy, some antibiotics, and fluid calculations. If the calculated dose exceeds the maximum single dose, it is automatically capped at the safe limit.
Step-by-Step Example
Enter child weight and height
A 3-year-old weighing 15 kg and 96 cm tall. BSA: sqrt((96 x 15) / 3600) = 0.632 m2.
Enter prescribed dose
Amoxicillin 25 mg/kg TID for otitis media. Single dose: 25 x 15 = 375 mg.
Check maximum dose
Maximum single dose for amoxicillin is 500 mg. The calculated 375 mg is within the safe range.
Calculate volume
Using 250 mg/5 mL suspension (50 mg/mL): 375 / 50 = 7.5 mL per dose.
Real-World Use Cases
Pediatric Nursing
Verify physician-ordered doses against weight-based calculations before administering medications to children.
Pediatric Pharmacy
Pharmacists cross-check prescribed doses against safe ranges before dispensing pediatric prescriptions.
Emergency Pediatrics
Quickly calculate weight-based doses in emergency situations using estimated or actual patient weights.
Common Mistakes to Avoid
Using adult doses for children. Children are not small adults. Pediatric doses must be calculated based on weight or BSA, not scaled down from adult doses.
Not verifying the child weight. An incorrect weight leads to proportionally incorrect doses. Weigh pediatric patients at each visit and document in kilograms.
Forgetting maximum dose limits. Even weight-based calculations can produce doses that exceed the safe maximum for a given drug. Always check the ceiling.
Confusing mg/kg/dose with mg/kg/day. The dosing interval matters. A drug dosed at 30 mg/kg/day TID is 10 mg/kg per dose, not 30 mg/kg per dose.
Frequently Asked Questions
Accuracy and Disclaimer
CRITICAL: This calculator is for educational and reference purposes only. Pediatric dosing errors can be fatal. All calculations must be independently verified by a licensed healthcare professional, pharmacist, or physician before any medication is administered to a child. Always consult age-appropriate pediatric formularies (Harriet Lane Handbook, Lexicomp Pediatric), verify maximum dose limits, and consider the child age, organ function, allergies, and clinical condition. Never rely solely on any calculator for pediatric patient care.
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