Amoxicillin Pediatric Dose Calculator

Determines dosage for infants and children, based on weight or common infections indications.

Refer to the text below the tool for more information about determining pediatric amoxicillin dosage.


Amoxicillin is a penicillin antibiotic recommended in treating different types of bacterial infection (e.g. tonsillitis, AOM, bronchitis, UTIs, pneumonia, bronchitis).

Common pediatric formulations include liquid, tablet or capsule for oral dosage.


General guidelines for amoxicillin dosage for children 1 month – 18 years are: 15 - 30mg/kg, to a maximum of 1,000mg; three times daily, however please seek advice from qualified personnel.

In case of strep A dosing – dosing depends on child’s body weight:

  • Under 15 kg – 50 mg/kg, once daily for 10 days;
  • 15- 29.9 kg – 750 mg, once daily for 10 days;
  • 30 kg or over – 1,000 mg, once daily for 10 days.

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Note: Amoxicillin general dosing 1 months – 18 years: 15 - 30mg/kg (maximum 1,000mg) three times daily, however please seek advice from qualified personnel.

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1. Fill in the calculator/tool with your values and/or your answer choices and press Calculate.

2. Then you can click on the Print button to open a PDF in a separate window with the inputs and results. You can further save the PDF or print it.

Please note that once you have closed the PDF you need to click on the Calculate button before you try opening it again, otherwise the input and/or results may not appear in the pdf.


 

Pediatric Amoxicillin Dosage Explained

Amoxicillin is a penicillin antibiotic recommended in treating different types of bacterial infection (e.g. tonsillitis, AOM, bronchitis, UTIs, pneumonia, bronchitis). Common pediatric formulations include liquid, tablet or capsule for oral dosage.

General guidelines for amoxicillin dosage for children 1 month – 18 years are: 15 - 30mg/kg, to a maximum of 1,000mg; three times daily.

In case of strep A dosing – dosing depends on child’s body weight:

  • Under 15 kg – 50 mg/kg, once daily for 10 days;
  • 15- 29.9 kg – 750 mg, once daily for 10 days;
  • 30 kg or over – 1,000 mg, once daily for 10 days.
Condition Indication Dose Divided
Acute otitis media (AOM) Any age + severe sx 80-90 mg/kg/day
To a max of 4 g/day
q8h x 10 days
2mo - 2yo q12h x 10 days
q8h x 10 days
2-5yo q12h x 7 days
q8h x 7 days
≥6yo q12h x 5-7 days
q8h x 5-7 days
Pneumonia ≥3mo 90 mg/kg/day
To a max of 4 g/day
q8h x 7-10 days
Acute bacterial rhinosinusitis Low-dose ≥2yo 45 mg/kg/day
To a max of 4 g/day
q12h x 5-10 days
High-dose ≥2yo 80-90 mg/kg/day
To a max of 4 g/day
q8h x 7-10 days
Group A streptococcal tonsillopharyngitis 3-18yo 50 mg/kg/day
To a max of 1 g/day
q12h x 10 days
Urinary tract infection (UTI) Any age 40 mg/kg/day
To a max of 1.5 g/day
q8h x 7 days

Pediatric doses are often expressed as mg/kg/day (similar to mg/kg) or mg/kg/dose and accompanied by a frequency of administration that can vary from once daily to every hour.

The daily dose is then multiplied by the infant or child’s weight in kilograms to obtain the daily dose. This value in mg is then divided by the frequency to determine each individual dose in mg.

  • Child dose by weight = (mg/day) = Adult Dose in mg/kg or mg/kg/day x Child Weight in kg

Some indications require one daily administration (qD), others require two doses a day (BID), three doses (TID) or four doses (QID).

Other indications may specify the time difference in hours, between two subsequent doses, for example administration every 4 hours (q4 hr) means the daily dose must be divided into 6 individual doses.

 

References

Gerald MC, O’Bannon FV. Nursing pharmacology and therapeutics. (2nd ed.). Englewood Cliffs, NJ: Prentice Hall Incorporated, 1988.

High dose amoxicillin: Rationale for use in otitis media treatment failures. Paediatr Child Health. 1999; 4(5):321-3.

Rann O, Sharland M, Long P, Wong ICK, Laverty AA, Bottle A, Barker CI, Bielicki J, Saxena S. Did the accuracy of oral amoxicillin dosing of children improve after British National Formulary dose revisions in 2014? National cross-sectional survey in England. BMJ Open. 2017; 7(9):e016363.


Specialty: Pharmacology

Article By: Denise Nedea

Published On: July 22, 2020

Last Checked: July 22, 2020

Next Review: July 22, 2025