Temperature conversion
18 °F to °C
-7.78 °C
18 degrees Fahrenheit = -7.78 degrees Celsius. Exact factor: °C = (°F − 32) × 5/9.
Live converter
Edit either field — the other updates instantly. Type decimal values like 38.4.
The formula
°C = (°F − 32) × 5/9
Worked example: (18 − 32) × 5/9 = -7.78 °C.
Values near 18 °F
| °F | °C |
|---|---|
| 15 | -9.44 |
| 16 | -8.89 |
| 17 | -8.33 |
| 18this page | -7.78 |
| 19 | -7.22 |
| 20 | -6.67 |
| 21 | -6.11 |
Frequently asked
How do you convert degrees Fahrenheit to degrees Celsius?
Apply the formula °C = (°F − 32) × 5/9. Enter any value in the live converter above and the result updates as you type.
What is 18 °F in °C?
18 °F equals -7.78 °C. The reference table below shows the values immediately around 18 °F.
Why does temperature conversion add 32?
The two scales have different zero points and step sizes. Water freezes at 32 °F but 0 °C, so the formula rescales by 5/9 and shifts by the 32-degree offset.