Amoxicillin Pediatric Calculator — Children's Dose by Weight

⚠️ CRITICAL SAFETY WARNING: Amoxicillin is a prescription antibiotic. This calculator is for EDUCATIONAL purposes only. Always follow your doctor's prescribed dose. If your child has an allergic reaction (hives, difficulty breathing), call 911 immediately. Poison Control: 1-800-222-1222.

🩺 Free Amoxicillin Pediatric Calculator — Exact Dose by Weight

Your Child's Amoxicillin Dose

💊 Dose Per Dose:—

Total Daily Dose:—

mL to give per dose:—

Treatment Duration:—

⚠️ ALLERGY WARNING: Penicillin allergy selected. DO NOT give amoxicillin without doctor approval.

☎️ Poison Control: 1-800-222-1222 | Emergency: 911

📋 Key Takeaways — Amoxicillin Dosing at a Glance

Standard: 40 mg/kg/day divided every 8-12 hours
Ear infection: 85 mg/kg/day divided every 12 hours × 10 days
Strep throat: 50 mg/kg/day once daily × 10 days (full course essential)
Pneumonia: 90 mg/kg/day divided every 8-12 hours
Suspensions: 125/200/250/400 mg per 5 mL
Always complete full prescribed course to prevent resistance

ℹ️ This free amoxicillin pediatric calculator uses AAP 2026 guidelines. Enter child's weight and infection type to get exact dose in mg and mL. Updated November 2026.

📊 Quick Reference: Standard 40 mg/kg/day | Ear infection 85 mg/kg/day | Strep throat 50 mg/kg/day once daily | Pneumonia 90 mg/kg/day

⚠️ NEVER share antibiotics with others. Always complete full course. Call 911 for allergic reactions: hives, difficulty breathing, facial swelling.

📊 Amoxicillin Pediatric Dosing by Infection Type

Infection	Dose (mg/kg/day)	Frequency	Duration
Standard Infections	40 mg/kg/day	Every 8-12 hours	7-10 days
Ear Infection (Otitis Media)	85 mg/kg/day	Every 12 hours	10 days
Strep Throat	50 mg/kg/day	Once daily	10 days (full course essential)
Pneumonia	90 mg/kg/day	Every 8-12 hours	7-10 days
Sinusitis	85 mg/kg/day	Every 12 hours	10-14 days

📊 Amoxicillin Dose by Weight (Quick Reference)

How much amoxicillin for common weights? Here's the standard dose (40 mg/kg/day, twice daily):

Child's Weight	Daily Dose	Per Dose (mg)	mL (250mg/5mL)
5 kg (11 lb)	200 mg/day	100 mg	2.0 mL
10 kg (22 lb)	400 mg/day	200 mg	4.0 mL
15 kg (33 lb)	600 mg/day	300 mg	6.0 mL
20 kg (44 lb)	800 mg/day	400 mg	8.0 mL
30 kg (66 lb)	1,200 mg/day	600 mg	12.0 mL
40 kg (88 lb)	1,600 mg/day	800 mg	16.0 mL

📊 Amoxicillin Suspension Strengths (2026)

Suspension	mg per mL	Best For	Typical Dose
125 mg/5 mL	25 mg/mL	Infants, small children	Low-dose prophylaxis
200 mg/5 mL	40 mg/mL	Intermediate dosing	Standard infections
250 mg/5 mL	50 mg/mL	Most common	Ear infections, strep
400 mg/5 mL	80 mg/mL	High-dose (ear, pneumonia)	Larger doses, less volume

👩 Emily, 4 years — Chicago, IL

Condition: Ear infection | Weight: 16 kg (35 lbs) | 250 mg/5 mL suspension

Result: 85 mg/kg/day → 680 mg every 12 hours → 13.6 mL per dose

✅ "Perfect! The calculator matched exactly what our pediatrician prescribed. So reassuring!"

👨 Noah, 7 years — Texas

Condition: Strep throat | Weight: 22 kg (48 lbs) | 400 mg/5 mL suspension

Result: 50 mg/kg/day once daily → 1,100 mg/day → 13.75 mL once daily

✅ "Our doctor confirmed the dose. The 10-day reminder helped us complete the full course!"

How Much Amoxicillin for My Child? (Quick Answer)

Formula: Total Daily Dose (mg) = Weight (kg) × Dose (mg/kg/day). Then divide by number of doses per day.

Examples (standard dose 40 mg/kg/day, twice daily):

15 kg child: 15 × 40 = 600 mg/day ÷ 2 = 300 mg per dose
20 kg child: 20 × 40 = 800 mg/day ÷ 2 = 400 mg per dose
30 kg child: 30 × 40 = 1,200 mg/day ÷ 2 = 600 mg per dose

Use the calculator above for your child's specific weight and infection type.

What is an Amoxicillin Pediatric Dosage Calculator and How Does It Work?

An amoxicillin pediatric dosage calculator is an essential tool for parents and caregivers to determine the correct weight-based dose of amoxicillin for children. Our amoxicillin pediatric calculator uses American Academy of Pediatrics (AAP) guidelines to provide accurate dosing for ear infections, strep throat, pneumonia, and other bacterial infections.

How does the calculator work? Enter your child's weight, select the type of infection, choose the dose frequency, and pick the suspension strength. The calculator instantly shows the per-dose amount in mg and mL, plus treatment duration.

Amoxicillin Dosing Formula by Weight

The standard formula for amoxicillin pediatric dosing is: Total Daily Dose (mg) = Weight (kg) × Dose (mg/kg/day). Then divide by number of doses per day.

Example: 15 kg child, standard dose 40 mg/kg/day divided twice daily = 15 × 40 = 600 mg total per day ÷ 2 = 300 mg per dose. With 250 mg/5 mL suspension (50 mg/mL), the child needs 6 mL per dose.

Amoxicillin Pediatric Dose by Infection

Standard Infections: 40 mg/kg/day divided every 8-12 hours.

Ear Infection (Otitis Media): 85 mg/kg/day divided every 12 hours × 10 days.

Strep Throat: 50 mg/kg/day once daily × 10 days (full course essential to prevent rheumatic fever).

Pneumonia: 90 mg/kg/day divided every 8-12 hours.

Sinusitis: 85 mg/kg/day divided every 12 hours × 10-14 days.

Amoxicillin Suspension Strengths

125 mg/5 mL (25 mg/mL) — for infants and small children. 200 mg/5 mL (40 mg/mL) — intermediate strength. 250 mg/5 mL (50 mg/mL) — most commonly prescribed. 400 mg/5 mL (80 mg/mL) — concentrated for larger doses.

Shake well before each use. Use the measuring device that comes with the prescription — household spoons are inaccurate.

Common Side Effects

Common side effects: diarrhea (10-15% of children), nausea, vomiting, rash (non-allergic), diaper rash. Call doctor if severe diarrhea, spreading rash with fever, or vomiting prevents dosing.

Emergency for allergic reaction: hives, difficulty breathing, swelling of face/lips/tongue, or fainting.

How to Give Amoxicillin to Children

Use the dosing syringe that comes with the prescription — not a kitchen spoon
Shake well before each use
Can be mixed with small amount of applesauce, yogurt, or juice — give full mixture immediately
Refrigerate reconstituted suspension (36-46°F) — discard after 14 days
Complete the full course even if symptoms improve

❓ Frequently Asked Questions

How much amoxicillin should I give my child?

Standard dose is 40 mg/kg/day divided every 8-12 hours. For a 15 kg child: 15 × 40 = 600 mg/day, divided twice daily = 300 mg per dose. Use the calculator above for your child's exact dose.

What is the amoxicillin dose for ear infections?

For ear infections (acute otitis media), the recommended dose is 85 mg/kg/day divided every 12 hours for 10 days. This higher dose is needed because amoxicillin penetrates the middle ear less effectively.

What is the amoxicillin dose for strep throat?

For strep throat, the dose is 50 mg/kg/day once daily (max 1,000 mg) for 10 days. Full 10-day course is essential to prevent rheumatic fever.

How do I calculate amoxicillin dose by weight?

Formula: Total Daily Dose (mg) = Weight (kg) × Dose (mg/kg/day). Then divide by number of doses per day. Example: 15 kg child at 40 mg/kg/day divided twice daily = 600 mg/day ÷ 2 = 300 mg per dose.

How many days should a child take amoxicillin?

Ear infections: 7-10 days. Strep throat: 10 days. Pneumonia: 7-10 days. Sinusitis: 10-14 days. Always complete the full prescribed course to prevent resistance.

How much amoxicillin is in 5 mL?

Suspension strengths: 125 mg/5 mL = 25 mg/mL. 200 mg/5 mL = 40 mg/mL. 250 mg/5 mL = 50 mg/mL. 400 mg/5 mL = 80 mg/mL. For 300 mg dose with 250 mg/5 mL, give 6 mL.

Can I give amoxicillin on an empty stomach?

Yes. Amoxicillin can be taken with or without food. If your child has an upset stomach, give with a small snack. Mixing with applesauce or yogurt helps children who refuse medicine.

What are the signs of amoxicillin allergy?

Warning signs: hives (raised red itchy bumps), difficulty breathing, swelling of face/lips/tongue, wheezing, or severe rash with fever. Call 911 immediately if these occur. Poison Control: 1-800-222-1222.

What are common amoxicillin side effects in children?

Common side effects: diarrhea (10-15% of children), nausea, vomiting, non-allergic rash, diaper rash. These usually resolve on their own. Call the doctor if severe diarrhea or rash with fever.

Can I mix amoxicillin with juice or food?

Yes. Mix with a small amount of applesauce, yogurt, or juice. Give the full mixture immediately - don't save for later. Do not mix with hot liquids (heat destroys the antibiotic).

How should amoxicillin suspension be stored?

Store reconstituted amoxicillin suspension in the refrigerator (36-46°F). Discard after 14 days. Shake well before each use. Keep out of reach of children.

What happens if I miss a dose?

Give the missed dose as soon as you remember. If it's almost time for the next dose, skip the missed dose. Never double up to catch up. Missing doses promotes antibiotic resistance.

💡 Expert Tips for Giving Amoxicillin to Children

Tip #1: Always use the measuring device that comes with the prescription. Household spoons are inaccurate and can lead to incorrect dosing.

Tip #2: For children who refuse liquid medicine, mix with a small amount of applesauce, yogurt, or chocolate syrup. Give the full mixture immediately.

Tip #3: Complete the full course of antibiotics even if symptoms improve — stopping early promotes antibiotic resistance.

Tip #4: Store reconstituted amoxicillin suspension in the refrigerator (36-46°F) and discard after 14 days.

Tip #5: Set a phone alarm for each dose. Missed doses are the #1 cause of treatment failure.

Tip #6: Never give amoxicillin to a child with a known penicillin allergy. If unsure, call the pediatrician first.

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🛡️ CDCalculators proprietary amoxicillin pediatric calculator — data sources: AAP 2026 guidelines, FDA prescribing information. Last updated November 12, 2026. Disclaimer: Educational purposes only. Always consult your pediatrician before administering any medication.