Pediatric Dose Calculator
Calculate safe pediatric medication doses using weight-based (mg/kg) and BSA-based (mg/m²) methods. Children are NOT small adults — pediatric pharmacokinetics differ significantly and require age/weight-specific dosing.
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Why: This page explains what the Pediatric Dose calculator does, what to enter, and how to read the results—without repeating the overview above.
How: Enter your values in the calculator fields below, keep units consistent, then run the calculation to see results and any step-by-step work shown on this page.
Run the calculator when you are ready.
📋 Quick Examples — Click to Load
Medical Disclaimer: This calculator is for educational purposes only. All pediatric doses must be verified by a qualified healthcare professional. Use oral syringes for accurate measurement.
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
Pediatric dosing requires weight-based (mg/kg) or BSA-based (mg/m²) calculations. Children are NOT small adults—pharmacokinetics differ significantly. Use recent weight and appropriate measuring devices. Medication errors in pediatrics can have serious consequences.
Sources: WHO, AAP, Lexicomp, Harriet Lane
Key Takeaways
- • Dose (mg) = Weight (kg) × Dose (mg/kg)
- • Volume (mL) = Dose ÷ Concentration × 5 (for mg/5mL)
- • Always use oral syringe for liquids—never household spoons
- • Verify against max single and max daily dose limits
Did You Know?
How Does Pediatric Dosing Work?
Weight-Based
Dose = Weight (kg) × mg/kg. Standard for antibiotics, antipyretics, antihistamines.
BSA-Based
BSA = √(H×W/3600). Used for chemotherapy, some immunosuppressants.
Volume Calculation
For mg/5mL: Volume = (Dose ÷ Concentration) × 5. Use pharmacy-provided device.
Expert Tips
Common Pediatric Medications
| Drug | mg/kg | Frequency | Max Single |
|---|---|---|---|
| Amoxicillin | 25-45 | Q8H or BID | 500 mg |
| Ibuprofen | 10 | Q6-8H | 400 mg |
| Acetaminophen | 15 | Q4-6H | 1000 mg |
| Prednisolone | 1-2 | Daily | 60 mg |
Frequently Asked Questions
Why is weight-based dosing used in children?
Children are NOT small adults. Pediatric pharmacokinetics differ—metabolism, absorption, and organ function vary with age. Weight-based dosing (mg/kg) individualizes therapy and prevents under- or over-dosing.
What is the Mosteller BSA formula?
BSA (m²) = √(Height cm × Weight kg / 3600). Used for chemotherapy and some immunosuppressants in pediatrics. More accurate than weight alone for body size.
How do I calculate liquid volume from mg dose?
Volume (mL) = Dose (mg) ÷ Concentration (mg per 5 mL) × 5. Example: 250 mg with 250 mg/5 mL = 5 mL. Always use an oral syringe—household spoons are inaccurate.
When should I use BSA vs weight-based dosing?
Weight-based (mg/kg) for most pediatric drugs: antibiotics, antipyretics, antihistamines. BSA-based for chemotherapy, some immunosuppressants, and drugs with narrow therapeutic index.
What are common pediatric medication errors?
Wrong weight (kg vs lbs), decimal errors, wrong concentration, and using household spoons. Double-check weight and use pharmacy-provided measuring devices.
Can this replace medical advice?
No. This tool is for educational purposes only. All pediatric doses must be verified by a qualified healthcare professional before administration.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. All pediatric doses must be verified by a qualified healthcare professional before administration. Use appropriate measuring devices.
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