When you log a temperature, you can enter it in °C or °F. New entries default to °C. Switching the unit converts the number you typed; it does not change temperatures already saved.
Where to find the unit switch
On the website
Participant observations → create or edit a Temperature log — field Temperature with °C | °F
Reports → Temperature (List, Archived, or Chart) — same pill on the form and beside the chart
In the Care Diary app
Temperature log form — field Temperature with °C | °F
Record a temperature
Open a temperature form (from the participant or from Reports → Temperature).
Select °C or °F on the Temperature unit control.
Enter the reading. An Equivalent line shows the value in the other unit when a number is present.
Save the log as usual.
Accepted range: 35.0–41.0 °C (about 95.0–105.8 °F). Care Diary shows an error if the value is outside that range or not a valid number.
Charts and lists
The chart unit toggle only changes how the chart is displayed. It does not rewrite saved records.
Lists and filters still show stored values in Celsius (for example Temperature (°C)). Exports can include the original reading and unit.
Tips
Leave the field blank if you are not ready to enter a value; switching units keeps a blank field blank.
Older logs recorded before units existed are treated as Fahrenheit when shown.