100°F in °C
100°F is 37.78°C. To convert Fahrenheit to Celsius, take away 32, then divide by 1.8.
Formula from NIST.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| Take away 32 | 100 − 32 | 68 |
| Divide by 1.8 | 68 ÷ 1.8 | 37.778 °C |
Where the figures come from
- Fahrenheit reading at the freezing point used in the conversion: 32 °F. Source: NIST Guide to the SI, Appendix B.9: factors for units listed by kind of quantity. Checked 14 November 2026.
- Fahrenheit degrees in one Celsius degree: 1.8. Source: NIST Guide to the SI, Appendix B.9: factors for units listed by kind of quantity. Checked 14 November 2026.
Nearby temperatures
| °F | °C |
|---|---|
| 80°F | 26.67°C |
| 85°F | 29.44°C |
| 90°F | 32.22°C |
| 95°F | 35°C |
| 98°F | 36.67°C |
| 99°F | 37.22°C |
| 100°F | 37.78°C |
| 101°F | 38.33°C |
| 102°F | 38.89°C |
| 103°F | 39.44°C |
| 104°F | 40°C |
| 105°F | 40.56°C |
| 110°F | 43.33°C |
How to convert Fahrenheit to Celsius
The US National Institute of Standards and Technology gives the conversion as °C = (°F − 32) ÷ 1.8. So to go from °F to °C, take away 32, then divide by 1.8. For example, 100°F is 3778°C.. See NIST's table.
The two scales meet at −40, where −40°C and −40°F are the same temperature.