Why can't I just give my child a smaller adult dose?

Children aren't just small adults—they metabolize medications differently due to immature liver and kidney function, different body composition (more water, less fat), and varying enzyme systems. Weight-based dosing (mg/kg) is more accurate than age-based or fractional adult dosing. Some medications safe for adults are dangerous for children, and dose-response relationships differ. Many medications have specific pediatric formulations and dosing guidelines. Always use pediatric-specific dosing calculations and consult a healthcare provider or pharmacist before administering any medication to a child.

How do I calculate mg/kg dosing accurately?

First, get an accurate current weight in kilograms (1 kg = 2.2 lbs, so divide pounds by 2.2). Find the recommended dose in mg/kg/day or mg/kg/dose from package insert or pharmacy. Multiply child's weight by the mg/kg dose. For example: 20 kg child, 10 mg/kg/day medication = 200 mg total daily dose. If given twice daily, that's 100 mg per dose. Always verify: maximum daily dose isn't exceeded, dosing frequency is correct, and concentration of liquid medication (mg/mL) to calculate volume. Double-check all math—medication errors are serious.

What medications are dangerous for children?

Never give children aspirin (risk of Reye's syndrome except in specific conditions), adult formulations of cough/cold medications (dangerous under age 4), prescription medications without provider approval, supplements without checking pediatric safety, or medications past expiration dates. Be cautious with: ibuprofen (not under 6 months without provider approval), certain antibiotics (tetracycline stains developing teeth), and any medication in adult formulation. Always use child-specific formulations, follow age/weight restrictions, and consult your pediatrician or pharmacist about any medication questions.

How often should I update medication doses as my child grows?

Recalculate medication doses with significant weight changes (typically every 5-10 lbs) or at least every 6 months for chronic medications. Many parents continue giving the same dose for too long, resulting in underdosing as the child grows. For acute medications (antibiotics, fever reducers), use current weight. Keep an updated weight chart at home and inform your pharmacy of weight changes so prescription labels reflect accurate dosing. If your child seems to have reduced medication response, they may have outgrown their dose—consult your healthcare provider.

Health

Pediatric Dose Calculator

Calculate safe medication dosages for children based on weight.

⚠️ Medical Disclaimer: This tool is for educational purposes only. Always verify dosages with a medical professional or pharmacist.

Single Dose

0.0 mg

Total Daily Dose:0.0 mg

Weight in kg:0.00 kg

How to Use This Calculator

Weigh Your Child Accurately

Get your child's current weight in kilograms or pounds. For infants, use a baby scale. For older children, weigh in minimal clothing. If you only know pounds, the calculator can convert (1 kg = 2.2 lbs).

Find Recommended Dose

Look up the medication's recommended pediatric dose on the label, package insert, or as provided by your healthcare provider. It's usually expressed as mg/kg/dose or mg/kg/day. Note maximum single dose and daily dose limits.

Enter Medication Information

Input the medication name, recommended dose (mg/kg), dosing frequency (how many times per day), and concentration if it's a liquid medication (mg/mL). The calculator will determine the appropriate dose in mg and, if applicable, mL.

Verify and Administer

Double-check all calculations, confirm the dose doesn't exceed maximum limits, and verify you're giving the correct concentration. Use an oral syringe or dosing cup for accurate measurement. When in doubt, consult your pediatrician or pharmacist. Never guess with medication dosing for children.