Adult Paracetamol (Acetaminophen) Dose Calculator
Estimate a weight-based dose range and conservative daily maximum for adults.
Educational tool only. Always follow your medication label or clinician instructions. Do not combine multiple products containing paracetamol/acetaminophen.
How this adult calculator works
This calculator uses a conservative, commonly used adult weight-based framework:
- Single dose range: 10 to 15 mg per kg per dose
- Usual interval: every 4 to 6 hours as needed
- Single-dose cap: 1,000 mg maximum
- Daily cap: min(60 mg/kg/day, 4,000 mg/day)
- Lower-risk setting option: min(45 mg/kg/day, 3,000 mg/day)
Different hospitals, countries, and clinicians may use slightly different limits, especially in long-term use, low body weight, or liver risk. If your care team gave you specific instructions, those always take priority.
Quick adult dosing reference
| Situation | Typical guidance | Notes |
|---|---|---|
| General healthy adult | 500 to 1,000 mg per dose every 4 to 6 hours | Do not exceed 4,000 mg/day (many clinicians prefer lower routine totals) |
| Weight-based approach | 10 to 15 mg/kg per dose | Cap at 1,000 mg per dose |
| Higher liver-risk setting | Use lower total daily limit | Often capped at 3,000 mg/day or lower by clinician |
Why dose per kg matters in adults
Many people think only children need weight-based dosing. In reality, adult body weight can still matter, especially in adults at lower weight, older adults, or people with medical conditions. A fixed 1,000 mg dose may be reasonable for some adults, but not ideal for everyone.
A mg/kg method helps personalize dosing while still respecting hard safety ceilings. That’s the purpose of this tool: practical guidance, not a diagnosis or prescription.
Example estimates
- 50 kg adult: about 500 to 750 mg per dose; daily max often around 3,000 mg using 60 mg/kg/day rule
- 70 kg adult: about 700 to 1,000 mg per dose (capped at 1,000 mg); daily max up to 4,000 mg
- 90 kg adult: raw 900 to 1,350 mg per dose, but dose is capped at 1,000 mg; daily max remains 4,000 mg
How to take paracetamol safely
1) Check all combination medicines
Cold, flu, pain, and sleep products often contain acetaminophen/paracetamol. It is easy to double-dose by accident.
2) Track total mg in 24 hours
Write down every dose. If needed, use a phone note: time + mg taken. This simple step prevents most accidental overdoses.
3) Leave enough time between doses
Typical spacing is at least 4 hours. Taking doses too close together can push blood levels too high.
4) Be extra careful with liver risk
If you have liver disease, frequent alcohol use, malnutrition, or are medically frail, ask your clinician for an individualized maximum.
When to seek urgent care
Get urgent medical help or call poison control immediately if there is a possible overdose, even if you feel fine at first. Early symptoms can be mild, while liver injury may develop later.
- Took more than instructed total daily amount
- Unsure how much was taken
- Nausea, vomiting, abdominal pain, unusual sweating, or confusion after high intake
- Child or vulnerable adult accidentally took medication
FAQ
Is this the same as a Tylenol dose calculator?
Yes. Tylenol is a brand name for acetaminophen, also known as paracetamol.
Can I use this calculator if I’m under 18?
No. Pediatric dosing should use age- and weight-specific guidance from a pediatric source or clinician.
Should I always take the highest number in the range?
Not necessarily. Start with the lowest effective dose for symptoms, and avoid unnecessary repeat dosing.