paracetamol dose calculator

How this paracetamol calculator works

Paracetamol (also called acetaminophen) is commonly dosed by body weight in children and by fixed ranges in adults. This calculator provides:

• A suggested single-dose range.
• A conservative maximum total amount in 24 hours.
• Optional conversions to mL of liquid and tablet count.

For children, common references use 10–15 mg/kg per dose every 4–6 hours, with an upper daily limit often around 75 mg/kg/day (not exceeding adult maximums). Individual clinical guidance may vary by country and clinical situation.

Standard dosing guidance (general reference)

Children

• Typical single dose: 10–15 mg/kg.
• Typical interval: every 4–6 hours.
• Maximum frequency: usually up to 5 doses in 24 hours.
• Typical daily maximum: 75 mg/kg/day, up to an adult ceiling.

Adults and adolescents (usually 12+ years)

• Typical single dose: 500–1000 mg.
• Typical interval: every 4–6 hours.
• Maximum daily total: 4000 mg/day in healthy adults (many clinicians use lower limits for routine use).

Why weight matters

Children process medicine differently as they grow. Weight-based dosing improves safety and helps avoid underdosing or overdosing. Estimating by age alone is less precise, especially if a child is significantly above or below average weight.

Common concentration mistakes to avoid

• Check bottle strength: some liquids are 120 mg/5 mL, others are 160 mg/5 mL.
• Use a dosing syringe, not a kitchen spoon.
• Track all products: cold/flu medicines may also contain paracetamol.
• Space doses correctly: giving doses too close together increases toxicity risk.

When to seek medical advice urgently

• Child is under 3 months old with fever.
• Known liver disease, severe malnutrition, heavy alcohol use, or enzyme-inducing medications.
• Vomiting everything, persistent high fever, dehydration, breathing difficulty, seizure, rash, or lethargy.
• Any possible overdose or accidental repeat dosing.

FAQ

Is this calculator a prescription?

No. It is an educational estimate. Always follow the label and your clinician’s instructions.

Can I alternate paracetamol and ibuprofen?

Some clinicians recommend this in specific situations, but schedules can become confusing and increase dosing errors. If needed, ask your pediatrician for a written plan.

What if I missed a dose?

Give the next dose only if needed and if enough time has passed since the previous dose. Do not “double up.”

Important disclaimer

This page provides general educational information and is not a substitute for professional medical care. If you are unsure about the correct dose for a specific patient, contact a pharmacist or healthcare professional.