Augmentin (Amoxicillin–Clavulanate) Pediatric Dose Calculator
Weight-based amoxicillin–clavulanate dosing for children — 25 mg/kg/day in 2 divided doses. Enter age and weight for the dose in mg and syrup mL or tablets.
Pediatric dosing
Mild/moderate infection (twice daily)
Mild/moderate infection (three times daily)
Severe infection / otitis media / sinusitis / LRTI (twice daily)
Severe infection / otitis media / sinusitis / LRTI (three times daily)
High dose — ES-600 (recurrent/persistent otitis media)
Amoxicillin–clavulanate dose chart by age and weight
Mild/moderate infection (twice daily). Weights are WHO/IAP reference medians for age — always dose on the measured weight.
| Age | Weight | Dose (mg) | 200 mg amoxicillin / 28.5 mg clavulanate per 5 mL | 400 mg amoxicillin / 57 mg clavulanate per 5 mL | Frequency |
|---|---|---|---|---|---|
| 3 months | 6.1 kg | 76.3 mg | 1.9 mL | 0.95 mL | Every 12 hours |
| 6 months | 7.6 kg | 95 mg | 2.4 mL | 1.2 mL | Every 12 hours |
| 9 months | 8.6 kg | 107.5 mg | 2.7 mL | 1.3 mL | Every 12 hours |
| 1 year | 9.3 kg | 116.3 mg | 2.9 mL | 1.5 mL | Every 12 hours |
| 18 months | 10.6 kg | 132.5 mg | 3.3 mL | 1.7 mL | Every 12 hours |
| 2 years | 11.8 kg | 147.5 mg | 3.7 mL | 1.8 mL | Every 12 hours |
| 3 years | 14.1 kg | 176.3 mg | 4.4 mL | 2.2 mL | Every 12 hours |
| 4 years | 16.2 kg | 202.5 mg | 5.1 mL | 2.5 mL | Every 12 hours |
| 5 years | 17.5 kg | 218.8 mg | 5.5 mL | 2.7 mL | Every 12 hours |
| 6 years | 19 kg | 237.5 mg | 5.9 mL | 3 mL | Every 12 hours |
| 8 years | 24.4 kg | 305 mg | 7.6 mL | 3.8 mL | Every 12 hours |
| 10 years | 31.1 kg | 388.8 mg | 9.7 mL | 4.9 mL | Every 12 hours |
| 12 years | 39.4 kg | 492.5 mg | 12.5 mL | 6.2 mL | Every 12 hours |
Strengths in the calculator
- 125 mg amoxicillin / 31.25 mg clavulanate per 5 mL (Oral)
- 200 mg amoxicillin / 28.5 mg clavulanate per 5 mL (Oral)
- 250 mg amoxicillin / 62.5 mg clavulanate per 5 mL (Oral)
- 400 mg amoxicillin / 57 mg clavulanate per 5 mL (Oral)
- 600 mg amoxicillin / 42.9 mg clavulanate per 5 mL (ES-600) (Oral)
- Tablet 625 mg (500 mg amoxicillin / 125 mg clavulanate) (Oral — do not split)
- Tablet 1 g (875 mg amoxicillin / 125 mg clavulanate) (Oral — do not split)
Different strength on your bottle? Use “Different strength on the bottle?” under the result.
Safety
Contraindications and cautions
- Penicillin allergy.
- Previous cholestatic jaundice or hepatic dysfunction with amoxicillin–clavulanate.
Pregnancy and breastfeeding
Legacy FDA category B. Generally considered acceptable in pregnancy; avoid in women at risk of preterm pre-labour rupture of membranes (necrotising enterocolitis signal).
Compatible with breastfeeding.
Clinical notes
Dose on the amoxicillin component only — never on the combined strength. Check the bottle ratio (4:1, 7:1 or 14:1) against the chosen regimen. Give at the start of a meal to reduce GI upset; diarrhoea is common.
Adult and adolescent (≥40 kg) dose
500 mg every 8 hours or 875 mg every 12 hours (amoxicillin component) — Every 8 hours with food (max 875 mg per dose, 1750 mg per day).
Children ≥40 kg are dosed as adults; the paediatric mg/kg regimens are not extrapolated. Doses refer to the amoxicillin component only.
Other names and brands
Also known as Co-amoxiclav, Amoxiclav, Amox-clav, Amoxicillin + clavulanic acid, Amoxicillin clavulanate potassium.
- India: Augmentin, Clavam, Moxclav
- UK: Augmentin
- USA: Augmentin
Brand examples only — products and strengths vary by country. Always check the label.
Frequently asked questions
What is the amoxicillin–clavulanate dose for children?
Mild/moderate infection (twice daily): 25 mg/kg/day in 2 divided doses. Usual duration: 5–10 days. Always use the child's measured weight and check the strength on the bottle.
How many mL of 200 mg amoxicillin / 28.5 mg clavulanate per 5 mL for an 11.8 kg child?
For mild/moderate infection (twice daily), an 11.8 kg child (about 2 years) needs 147.5 mg per dose — 3.7 mL of 200 mg amoxicillin / 28.5 mg clavulanate per 5 mL, every 12 hours. Recalculate with the child's actual weight.
From what age can amoxicillin–clavulanate be given?
Age range in PediaRx: ≥3 months and <40 kg for the paediatric mg/kg calculator. The calculator does not calculate a dose below 3 months. Each indication can have its own age and weight limits, shown with its regimen.
Is amoxicillin–clavulanate safe in pregnancy?
Legacy FDA category B. Generally considered acceptable in pregnancy; avoid in women at risk of preterm pre-labour rupture of membranes (necrotising enterocolitis signal).
Sources and editorial process
- Amoxicillin and clavulanate potassium for oral suspension — paediatric dosing (US prescribing information) — DailyMed (U.S. National Library of Medicine)
- BNF for Children — Co-amoxiclav — NICE / BMJ Group / Royal Pharmaceutical Society
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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