Dose Calculator (100 mg/mL)
Enter weight and dosing settings to estimate a single dose in milligrams and milliliters.
Educational tool only. Always verify with a physician or pharmacist, especially in infants, low body weight, liver disease, dehydration, or if taking other medicines that contain paracetamol/acetaminophen.
How this 100 mg/mL paracetamol calculator works
This tool converts a weight-based paracetamol dose from mg/kg into a liquid volume for a concentration of 100 mg/mL. The core formula is straightforward:
Single dose (mg) = weight (kg) × dose (mg/kg)
Single dose (mL) = single dose (mg) ÷ 100 (mg/mL)
In addition to the single-dose estimate, the calculator also checks your planned number of doses in 24 hours against commonly used daily limits.
Standard dosing references used in the calculator
Typical per-dose range
- Common oral dose: 10-15 mg/kg per dose
- Typical interval: every 4-6 hours
Common daily limits
- Children: often capped near 60 mg/kg/day (practice may vary by region/protocol)
- Adults and larger adolescents: generally do not exceed 4,000 mg/day
- Absolute practical frequency limit: no more than 6 doses in 24 hours
Local guidelines, hospital policies, and prescriber instructions may differ. If your healthcare professional gives a different plan, follow their instructions.
Example conversion at 100 mg/mL
If a child weighs 20 kg and uses 15 mg/kg:
- Dose in mg: 20 × 15 = 300 mg
- Volume in mL: 300 ÷ 100 = 3 mL
So one dose would be 3 mL of a 100 mg/mL solution.
When extra caution is needed
- Infants younger than 3 months
- Liver disease, severe malnutrition, chronic alcohol use, or dehydration
- Simultaneous use of multiple paracetamol-containing products
- Uncertain concentration on the bottle label
- Repeated vomiting, inability to keep medicine down, or persistent high fever
Frequently asked questions
Is paracetamol the same as acetaminophen?
Yes. The names differ by country, but they refer to the same active ingredient.
Why does concentration matter so much?
Different liquids can have very different strengths. A dosing volume that is safe at one concentration may be dangerous at another. This page is specifically for 100 mg/mL.
Can I give a dose sooner than 4 hours?
No. Typical recommendations use at least a 4-hour interval unless your clinician explicitly instructs otherwise.
What if I already gave another medicine for cough/cold?
Check the ingredient label. If it contains paracetamol/acetaminophen, count that dose in your daily total and seek medical advice before giving more.
Final note
A calculator is useful for quick conversions, but it is not a substitute for clinical judgement. If symptoms are severe, prolonged, or unclear, contact your doctor, pharmacist, or local emergency service.