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About this tool
Informational timer for paracetamol spacing: next earliest dose time, doses left in 24 hours and how close you are to the daily limit.
Paracetamol dosing is governed by two separate limits — a minimum gap between doses, usually 4 to 6 hours, and a 24-hour total of 4000 mg for adults (many labels use 3000 mg). This timer takes the time of your last dose, how many doses have been taken in the past 24 hours and the strength of each, then returns the earliest time for the next dose, how many doses remain and which limit you will reach first. Weight-based paediatric dosing at 15 mg/kg per dose is supported. It is informational arithmetic on the label limits, not medical advice.
Open Paracetamol Dose Interval Timer on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Tracks the spacing rule and the 24-hour milligram total, and names whichever binds first.
Applies 15 mg/kg per dose and the 60 mg/kg daily ceiling, capped at the adult maximum.
Reminds you that cold and flu remedies commonly contain paracetamol, which is how accidental overdoses happen.
At least 4 hours, and 4 to 6 hours is the usual instruction on adult and children's labels. With a 4-hour gap no more than 6 doses fit in a day, and the 24-hour milligram total usually runs out before that.
4000 mg for most adults — for example four doses of 1000 mg, or eight 500 mg tablets. Many over-the-counter labels set a 3000 mg ceiling instead as an added safety margin, and lower limits apply with liver disease, low body weight, malnutrition or regular alcohol use.
The standard paediatric dose is 15 mg per kilogram of body weight, every 4 to 6 hours, with no more than 4 doses in 24 hours — about 60 mg/kg a day. A 20 kg child would therefore take roughly 300 mg per dose and no more than 1200 mg in a day. Always check the concentration on the bottle, and get dosing for infants from a doctor or pharmacist.
Contact a doctor, emergency department or poisons service immediately, even if you feel completely well. Liver injury from paracetamol develops with few early symptoms, and the antidote works best when it is started within the first several hours.