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About this tool
Log a child's temperature, timing, fluids and medicine doses, then get a shareable summary with fluid targets and red-flag prompts.
The Child Fever Log records each temperature reading with the time, the measurement site, the fluids your child drank and any medicine given, then converts every reading to a core-equivalent temperature so the numbers are comparable. It uses the standard fever definition of 38.0 °C (100.4 °F) core, adds the usual site corrections of about 0.5 °C for armpit and 0.4 °C for oral readings, and estimates daily fluid needs with the Holliday-Segar 100/50/20 mL/kg maintenance rule plus roughly 12% extra per degree of fever. The output is a plain summary you can read out at a clinic or paste into a message.
Open Child Fever Log on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Armpit, oral and ear readings are corrected to a common core-equivalent figure so a rise or fall is real, not a thermometer artefact.
Daily fluid need is calculated from weight with the Holliday-Segar rule and increased for the height of the fever.
One copy button produces the timeline, peak, duration, fluids and dose timing in the order a doctor asks for them.
A core temperature of 38.0 °C (100.4 °F) or higher is a fever. Armpit readings run about 0.5 °C below core and oral readings about 0.4 °C below, so an armpit reading of 37.5 °C already corresponds to a fever. Ear and forehead thermometers are usually calibrated to display the core-equivalent value directly.
Immediately for any fever of 38.0 °C or more in a baby under three months, and the same day for a temperature of 39.0 °C or more in an infant aged three to six months. Also seek urgent help at any age for a non-blanching rash, laboured breathing, unusual drowsiness or floppiness, a seizure, or if the child simply seems seriously unwell.
Start from maintenance fluids: 100 mL per kg for the first 10 kg, 50 mL per kg for the next 10 kg and 20 mL per kg above that. A 12 kg child therefore needs about 1,100 mL a day at baseline, and roughly 12% more for each degree of fever above 37 °C. Small, frequent sips are usually easier than large drinks.
Paracetamol is normally spaced at least four hours apart with a maximum of four doses in 24 hours, and ibuprofen at least six hours apart with a maximum of four doses. The actual dose depends on the child's weight and must come from the product label, a pharmacist or a doctor — this log tracks timing only and never suggests an amount.