Pediatric Fever Management Calculator
Assesses whether a child's fever warrants medication and estimates a dosing indicator based on temperature, weight, age, and time since the last dose. Use it to decide whether it is safe to give another dose of fever reducer.
About this calculator
This calculator combines two clinical checks: fever severity and medication re-dosing safety. The fever elevation above normal (37°C) is scaled by an age factor — 1.2 for infants under 1 year (who tolerate fever less well) and 1.0 for older children — then multiplied by a weight-proportional factor (weight × 0.15) to produce a severity score. A critical gate checks whether enough time has elapsed since the last dose: acetaminophen requires at least 4 hours between doses, ibuprofen requires at least 6 hours. If the re-dosing interval has not been met, the output is zero, indicating medication should not be given yet. Formula: score = round(((temperature − 37) × ageFactor × (weight × 0.15) × redosingAllowed) × 100) / 100. A non-zero score suggests medication may be appropriate; always confirm with your paediatrician.
How to use
A 2-year-old weighing 12 kg has a temperature of 38.5°C. Last medication was acetaminophen given 5 hours ago. Age factor = 1.0 (child > 1 year). Re-dosing allowed = 1 (5 hours ≥ 4-hour acetaminophen interval). Score = ((38.5 − 37) × 1.0 × (12 × 0.15) × 1) = 1.5 × 1.8 × 1 = 2.7. A non-zero result confirms medication may be given. If only 3 hours had passed, the gate would return 0, indicating it is too soon for another dose.
Frequently asked questions
At what temperature should you give a child fever-reducing medication?
Most pediatric guidelines suggest considering fever-reducing medication when temperature exceeds 38.5°C (101.3°F) and the child appears uncomfortable. Temperature alone is not the only factor — a child with 39°C who is playing and drinking normally may need only monitoring, while a child with 38.5°C who is listless or in pain may benefit from treatment. Infants under 3 months with any fever above 38°C should be seen by a doctor immediately regardless of other symptoms.
How long should you wait between doses of children's acetaminophen and ibuprofen?
Acetaminophen (paracetamol) should be given no more frequently than every 4–6 hours, with a maximum of 5 doses in 24 hours. Ibuprofen should be spaced at least 6–8 hours apart, with a maximum of 3–4 doses per day. Exceeding these intervals risks liver damage (acetaminophen) or gastrointestinal and kidney problems (ibuprofen). Always use the weight-appropriate dose and a proper measuring device, never a kitchen spoon.
When should a parent seek emergency care for a child with a fever?
Seek emergency care immediately if a child under 3 months has any fever, if a child of any age has a fever above 40°C (104°F) that does not respond to medication, or if the child shows a non-blanching rash, stiff neck, severe headache, difficulty breathing, persistent vomiting, seizure, or is unusually difficult to wake. A febrile seizure, while frightening, is not in itself an emergency in most cases, but the child should still be evaluated promptly. When in doubt, call your local emergency services or paediatric advice line.