Paracetamol Dosage Calculator by Weight

Determines the dose to be administered safely to children every four to six hours, customisable by solution.

Refer to the text below the tool for more information about dosing paracetamol to infants and children.


Paracetamol is considered a drug that can be used for pain and fever relief in children and infants above 3 months of age, without causing drowsiness, frequent or serious side effects. The paracetamol dose should be based on the child’s actual body weight, without exceeding the adult dose, nor take more than four doses, at 4 to 6 hours apart.

It’s recommended to give the lowest dose that’s effective for the shortest period of time. Safe dosing guidelines are crucial in avoiding overdosing or poisonous ingestion.

Please note this Paracetamol Calculator is for information purpose only and you should speak to your doctor for qualified advice.


Paracetamol requires doctor’s dosing advice for administration to infants younger than 3 months and with a weight of 5 kg (11 lbs) or lower.

The oral dose of paracetamol for infants and children is: 15 mg/kg per dose, to a maximum of 1 g per dose, every four to six hours (to a maximum of four doses per day), with a maximum of 60 mg/kg daily, without exceeding 4 g daily.

Examples of paracetamol formulas include:

  • Infant Syrup (120 mg/5 mL)
  • Six plus syrup (250 mg/5 mL)
  • Tablets (500 mg)

Infant/Child Age
Infant/Child Weight
Paracetamol Formula
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Steps on how to print your input & results:

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 Paracetamol Dosing

Paracetamol is considered a drug that can be used for pain and fever relief in children and infants, without causing drowsiness, frequent or serious side effects. Paracetamol requires doctor’s dosing advice for administration to infants younger than 3 months and with a weight of 5 kg (11 lbs) or lower.

The paracetamol dose, as is the case with most other pediatric dosings, should be based on the child’s actual body weight, not their age, without exceeding the adult dose, nor take more than four doses, at 4 to 6 hours apart.

The oral dose of paracetamol for infants and children is: 15 mg/kg per dose, to a maximum of 1 g per dose, every four to six hours (to a maximum of four doses per day), with a maximum of 60 mg/kg daily, without exceeding 4 g daily.

Examples of paracetamol formulas include:

  • Infant Syrup (120 mg/5 mL)
  • Six plus syrup (250 mg/5 mL)
  • Tablets (500 mg)

A loading dose of 30 mg/kg (up to 1.5 g) may be given provided there has been no paracetamol administered within the preceding 12 hours.

It was found that due to the narrow therapeutic index of paracetamol, children under five years who are acutely unwell are particularly vulnerable to paracetamol toxicity and at increased risk of overdose.

Caution must be exerted when the weight-based dosing is applied to children weighing over 65 kg (143 lbs) so that daily adult paracetamol dose (4 g/day) is not exceeded.

Caution must also be exerted when administering paracetamol to children who are severely under-weight or malnourished, due to greater susceptibility to paracetamol toxicity (because of reduced levels of the detoxifying glutathione enzyme). Reduced 10 mg/kg doses or longer periods between dosing may be adopted in such cases.

It’s recommended to give the lowest dose that’s effective for the shortest period of time. Safe dosing guidelines are crucial in avoiding overdosing or poisonous ingestion.

The three most common errors in administering paracetamol include:

  • Exceeding recommended doses;
  • Dosing more frequent than at 4-6hours, up to 4 times a day;
  • Prolonged dosing (several days).
 

References

Goldstein LH, Berlin M, Berkovitch M, Kozer E. Effectiveness of oral vs rectal acetaminophen: a meta-analysis. Arch Pediatr Adolesc Med. 2008; 162(11):1042-1046.

Pierce CA, Voss B. Efficacy and safety of ibuprofen and acetaminophen in children and adults: a meta-analysis and qualitative review. Ann Pharmacother. 2010; 44(3):489-506.

Bilenko N, Tessler H, Okbe R, Press J, Gorodischer R. Determinants of antipyretic misuse in children up to 5 years of age: a cross-sectional study. Clin Ther. 2006; 28(5):783-93.


Specialty: Pharmacology

Article By: Denise Nedea

Published On: July 2, 2020

Last Checked: July 2, 2020

Next Review: July 2, 2025