18 Fahrenheit to Celsius
18 degrees Fahrenheit equals
-7.78°C
-7.78 degrees Celsius
18°F is -7.78°C, well below the point where water freezes. Roads ice over here, and this is where winter forecasts in northern climates spend most of the season. For reference, water freezes at 0°C, or 32°F.
How to convert 18°F to °C
Formula
°C = (°F − 32) × 5/9
Substituting 18°F
- 18 − 32 = -14
- -14 × 5/9 = -7.78
Fahrenheit places the freezing point of water at 32 rather than 0, so that offset comes off first. What remains is then scaled by 5/9, because a Celsius degree covers 1.8 times as much temperature change as a Fahrenheit degree.
How 18°F compares
| Reference point | Temperature | Difference |
|---|---|---|
| Freezing point of water | 0°C / 32°F | 7.8°C (14°F) colder |
| Room temperature | 21°C / 69.8°F | 28.8°C (51.8°F) colder |
| Body temperature | 37°C / 98.6°F | 44.8°C (80.6°F) colder |
| Boiling point of water | 100°C / 212°F | 107.8°C (194°F) colder |