Body Temperature Log

Track body temperature readings in Celsius or Fahrenheit, monitor fever trends, and export your log locally from your browser.

Create a profile to start logging

About Body Temperature Log

Body Temperature Log is a free private tool for tracking body temperature over time. You can log readings in Celsius or Fahrenheit, record where the temperature was taken, and view trends in a simple chart. It is useful for monitoring fever patterns during illness or keeping a general family health record. Everything stays in your browser using IndexedDB, so no account or server upload is needed.

Temperature Ranges

Low

Below 36.0°C / 96.8°F

Normal

36.0–37.4°C / 96.8–99.3°F

Elevated

37.5–37.9°C / 99.5–100.2°F

Fever

38.0–39.4°C / 100.4–102.9°F

High Fever

39.5°C+ / 103.1°F+

These ranges are general guidance only and do not replace medical advice. Measurement method and device type can affect readings.

How to Use the Body Temperature Log

  1. Create a profile for yourself or a family member.
  2. Click Add Reading and enter the temperature in °C or °F.
  3. Select the measurement location such as oral, ear, forehead, or armpit.
  4. Add optional notes such as symptoms, medication, or time of day.
  5. Use the date range and location filter to narrow the log.
  6. Review the trend chart and export data as CSV if needed.

Frequently Asked Questions

Is my data private?

Yes. All profiles and readings are stored locally in your browser. Nothing is sent to a server.

Why does the chart use Celsius?

The chart uses normalized Celsius values so readings in Celsius and Fahrenheit can be compared accurately on one timeline.

Can I mix Celsius and Fahrenheit?

Yes. Each reading stores its original unit, and the tool converts it automatically for charting and summaries.

Does the measurement location matter?

Yes. Ear, forehead, oral, armpit, and rectal readings can differ slightly. Recording the location helps you spot more consistent patterns.

Is this a medical diagnostic tool?

No. This log is for personal tracking only. If you have persistent fever, low temperature, or concerning symptoms, contact a healthcare professional.