Ibuprofen Dosage Calculator

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Dosing strategy differs: children use weight-based dosing, adults use standard fixed doses.
Body weight is the most reliable basis for ibuprofen dosing.
kg
Age helps flag eligibility. Ibuprofen is not recommended for children under 6 months.
years
Standard 5 mg/kg is suitable for mild pain or low fever. High 10 mg/kg (max 400 mg) is the upper limit used for more significant pain or fever - always use the lowest effective dose.
Choose the product you have on hand to get the exact volume or count needed per dose.
Ibuprofen can be given every 6-8 hours. Every 8 hours is preferred to minimize GI exposure.
Single doseLow dose
100mg

Ibuprofen per dose (rounded to the nearest practical amount)

Maximum daily dose800mg
Liquid volume per dose5mL
Liquid volume (teaspoons)1tsp
Doses per day3doses
Interval between doses8hours
Weight (for reference)20kg
100 mg
Low<200Standard200-400Rx - moderate400-600Rx - high600+

Safe dose: 100 mg every 8 hours (max 800 mg/day).

  • Dose of 100 mg equals approximately 5.0 mg/kg for this child.
  • Give every 8 hours as needed, up to 3 doses per day (300 mg total) - total daily ibuprofen should not exceed 800 mg.
  • Always measure liquid ibuprofen with an oral dosing syringe, not a kitchen spoon - household spoons vary significantly in volume.
  • Take ibuprofen with food or milk to reduce the chance of stomach upset.

Next stepIf fever or pain does not improve after 2 days, or worsens at any point, contact your child's doctor.

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