What Is 39°C in Fahrenheit?
39 degrees Celsius is exactly 102.2 degrees Fahrenheit.
How to Convert Celsius to Fahrenheit
To convert degrees Celsius to degrees Fahrenheit, multiply by 9/5, then add 32.
For example: 25 °C × 9/5 = 45, and 45 + 32 = 77 °F.
Where You Meet This Number
A reading of 39 °C is a high fever by any definition, and it is the kind of number people convert in a hurry while deciding what to do next. In American terms it is 102.2 °F.
A thermometer showing 39.0 °C reads 102.2 °F on an American device.
What People Get Wrong
How ill someone seems matters more than the reading. A child who is alert and drinking at 39 °C is usually less concerning than one who is listless at 38 °C — the thermometer is one input, not the verdict.
Body Temperatures in Celsius and Fahrenheit
| Degrees Celsius (°C) | Degrees Fahrenheit (°F) |
|---|---|
| 37 | 98.6 |
| 37.5 | 99.5 |
| 38 | 100.4 |
| 38.5 | 101.3 |
| 39 | 102.2 |
| 39.5 | 103.1 |
| 40 | 104 |
| 40.5 | 104.9 |
| 41 | 105.8 |
| 41.5 | 106.7 |
| 42 | 107.6 |
About These Scales
Degree Celsius
The Celsius scale puts the freezing point of water at 0 degrees and its boiling point at 100 degrees at sea level. It is the everyday temperature scale in nearly every country except the United States.
Degree Fahrenheit
On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees, so one Fahrenheit degree is 5/9 the size of a Celsius degree. It remains the standard scale for weather, ovens and body temperature in the United States.
Definitions follow The SI Brochure, BIPM. See how we calculate for the exact values and rounding rules.
Frequently Asked Questions
Is 39 °C dangerous?
It is a high fever and worth medical advice, particularly in young children, older adults, or alongside symptoms such as confusion, a stiff neck, difficulty breathing or a rash that does not fade under pressure.
What is 40 °C in Fahrenheit?
40 °C is exactly 104 °F, a fever high enough to warrant medical advice.
What is 39.5 °C in Fahrenheit?
39.5 °C is exactly 103.1 °F, close to the point US guidance says to call a doctor.
How high can a fever go?
Fevers from infection rarely exceed 41 °C (105.8 °F). Higher readings usually indicate heatstroke or another cause and need urgent medical attention.