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Paracetamol Dose Calculator

Work out paracetamol dose instantly with clear inputs, formula shown and shareable results.

About Paracetamol Dose Calculator

Calculates a weight-based paracetamol dose and checks the daily total against the lower of 75 mg/kg/day and the 4 g adult ceiling.

Formula

Paracetamol dosing

Dose = weight x 15 mg/kg every 4-6 hours; daily ceiling = min(75 mg/kg/day, 4000 mg/day)

Worked example

With the default values below, Paracetamol Dose Calculator returns Dose per administration of 300. Change any input above and every figure here is recalculated in your browser.

Inputs used

Body weightaccepts 2–150 kg
20 kg
Dose per kilogramaccepts 7.5–20 mg/kg
15 mg/kg
Doses per dayaccepts 1–6
4

Results

Dose per administration
300 mg
Total daily dose
1,200 mg
Applicable daily ceiling
1,500 mg
Ceiling check
Within the usual ceiling

Step by step

  1. 1Values used
  2. 2Paracetamol dosing
  3. 3Dose per administration= 300 mg
  4. 4Total daily dose= 1,200 mg
  5. 5Applicable daily ceiling= 1,500 mg
  6. 6Ceiling check= Within the usual ceiling

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why is the adult cap 4 g?

Above 4 g a day the risk of hepatotoxicity rises sharply, and lower caps apply in low body weight, liver disease or malnutrition.

Does the route change the dose?

Intravenous and rectal dosing differ from oral dosing; follow the product literature for each route.

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