Step by step
- Press the swap button so the converter goes from Fahrenheit to Celsius.
- Type 100 into the value box to see 37.78 °C and the formula.
- Compare the result with standard fever thresholds: 100.4 °F (38 °C) is the clinical cutoff for a full fever.
At a glance
| Body status | Fahrenheit (°F) | Celsius (°C) |
|---|---|---|
| Normal average | 98.6 °F | 37.0 °C |
| Low-grade fever | 100.0 °F | 37.8 °C |
| Clinical fever | 100.4 °F | 38.0 °C |
| High fever | 102.2 °F | 39.0 °C |
Related questions
Is 100 °F a fever in adults or kids?
100 °F (37.8 °C) is a mild or low-grade fever. Medical guidelines generally define a true fever starting at 100.4 °F (38 °C).
What is 101 °F and 102 °F in Celsius?
101 °F equals 38.3 °C, and 102 °F equals 38.9 °C.
How do I switch a digital thermometer from °F to °C?
On most digital thermometers, turn the device off, then press and hold the power button for 3 to 5 seconds until the scale flashes between °F and °C.
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Updated November 14, 2026.