Amoxicillin Pediatric Dose Calculator
Weight-based amoxicillin dosing for children — 15–30 mg/kg/dose · every 8 hours · max 500 mg/dose. Enter age and weight for the dose in mg and syrup mL or tablets.
Pediatric dosing
Standard dose (mild–moderate infection)
High dose — otitis media, sinusitis, pneumonia
Streptococcal pharyngitis (group A strep)
Amoxicillin dose chart by age and weight
Standard dose (mild–moderate infection). Weights are WHO/IAP reference medians for age — always dose on the measured weight.
| Age | Weight | Dose (mg) | Suspension 125 mg/5 mL | Suspension 200 mg/5 mL | Frequency |
|---|---|---|---|---|---|
| 1 month | 4.3 kg | 107.5 mg | 4.3 mL | 2.7 mL | Every 8 hours |
| 3 months | 6.1 kg | 152.5 mg | 6.1 mL | 3.8 mL | Every 8 hours |
| 6 months | 7.6 kg | 190 mg | 7.6 mL | 4.8 mL | Every 8 hours |
| 9 months | 8.6 kg | 215 mg | 8.6 mL | 5.4 mL | Every 8 hours |
| 1 year | 9.3 kg | 232.5 mg | 9.3 mL | 5.8 mL | Every 8 hours |
| 18 months | 10.6 kg | 265 mg | 10.5 mL | 6.6 mL | Every 8 hours |
| 2 years | 11.8 kg | 295 mg | 12 mL | 7.4 mL | Every 8 hours |
| 3 years | 14.1 kg | 352.5 mg | 14 mL | 8.8 mL | Every 8 hours |
| 4 years | 16.2 kg | 405 mg | 16 mL | 10 mL | Every 8 hours |
| 5 years | 17.5 kg | 437.5 mg | 17.5 mL | 11 mL | Every 8 hours |
| 6 years | 19 kg | 475 mg | 19 mL | 12 mL | Every 8 hours |
| 8 years | 24.4 kg | 500 mg | 20 mL | 12.5 mL | Every 8 hours |
| 10 years | 31.1 kg | 500 mg | 20 mL | 12.5 mL | Every 8 hours |
| 12 years | 39.4 kg | 500 mg | 20 mL | 12.5 mL | Every 8 hours |
Strengths in the calculator
- Suspension 125 mg/5 mL (Oral)
- Suspension 200 mg/5 mL (Oral) — Common in the US.
- Suspension 250 mg/5 mL (Oral)
- Suspension 400 mg/5 mL (Oral) — Useful for high-dose regimens; common in the US.
- Dispersible tablet 250 mg (Oral) — WHO/UNICEF childhood pneumonia formulation — disperse in a little water or breast milk.
- Capsule 250 mg (Oral)
- Capsule 500 mg (Oral)
Different strength on your bottle? Use “Different strength on the bottle?” under the result.
Safety
Contraindications and cautions
- Penicillin allergy.
Pregnancy and breastfeeding
Legacy FDA category B. Widely used and considered safe in pregnancy.
Compatible with breastfeeding.
Clinical notes
A non-allergic maculopapular rash is common when given during infectious mononucleosis (EBV). Complete the prescribed course.
Adult and adolescent (≥40 kg) dose
500 mg–1 g — Every 8 hours (max 1 g per dose, 3 g per day).
Severe infection: 1 g every 8 hours.
Other names and brands
Also known as Amoxycillin, Amox.
- India: Mox, Novamox
- UK: Amoxil
- USA: Amoxil
Brand examples only — products and strengths vary by country. Always check the label.
Frequently asked questions
What is the amoxicillin dose for children?
Standard dose (mild–moderate infection): 15–30 mg/kg/dose · every 8 hours · max 500 mg/dose. Usual duration: 5–7 days. Always use the child's measured weight and check the strength on the bottle.
How many mL of suspension 125 mg/5 mL for an 11.8 kg child?
For standard dose (mild–moderate infection), an 11.8 kg child (about 2 years) needs 295 mg per dose — 12 mL of Suspension 125 mg/5 mL, every 8 hours. Recalculate with the child's actual weight.
From what age can amoxicillin be given?
Age range in PediaRx: 1 month – adult. The calculator does not calculate a dose below 1 month. Each indication can have its own age and weight limits, shown with its regimen.
Is amoxicillin safe in pregnancy?
Legacy FDA category B. Widely used and considered safe in pregnancy.
Sources and editorial process
- BNF for Children — Amoxicillin — NICE / BMJ Group / Royal Pharmaceutical Society
- The diagnosis and management of acute otitis media (Lieberthal et al., Pediatrics 2013) — American Academy of Pediatrics
- Management of community-acquired pneumonia in infants and children older than 3 months (Bradley et al., Clin Infect Dis 2011) — PIDS / IDSA
- Revised WHO classification and treatment of childhood pneumonia at health facilities (2014) — World Health Organization
- Clinical practice guideline for group A streptococcal pharyngitis (Shulman et al., Clin Infect Dis 2012) — IDSA
Dosing data last updated 2026-09-27. PediaRx is built and maintained by Dr. Shounak Pal, MBBS (Medical Officer, Government of West Bengal, India — founder and developer of PediaRx). Every regimen is encoded with explicit units, maximum doses and age/weight limits and is checked by automated tests before publication. Report an error: hello@pediarx.com.
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Clinical disclaimer: reference tool for qualified health professionals. Verify every dose against current guidance and the product label before prescribing.
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