-18 °C = -0.4 °F
-18 degrees Celsius is -0.4 degrees Fahrenheit exactly.
- Exact
- -0.4 °F
- Rounded
- -0.4 °F
- Formula
- -18 × 9/5 + 32
Convert any other temperature
Type in either box; the other follows, and the scale moves with it. Works for decimals and, for temperatures, numbers below zero.
Around -18 °C
Celsius to Fahrenheit for the whole numbers either side of -18, rounded to one decimal place. Each row opens its own page.
| Degrees Celsius | Degrees Fahrenheit |
|---|---|
| -23 °C | -9.4 °F |
| -22 °C | -7.6 °F |
| -21 °C | -5.8 °F |
| -20 °C | -4 °F |
| -19 °C | -2.2 °F |
| -18 °C | -0.4 °F |
| -17 °C | 1.4 °F |
| -16 °C | 3.2 °F |
| -15 °C | 5 °F |
| -14 °C | 6.8 °F |
| -13 °C | 8.6 °F |
How to convert Celsius to Fahrenheit
The formula
°F = °C × 9/5 + 32. The two scales start from different zero points, so there is a subtraction as well as a multiplication.
Worked through for -18
Multiply by 9/5 (1.8): -18 × 1.8 = -32.4. Add 32: -32.4 + 32 = -0.4. Rounded, that is -0.4 °F.
In your head
Double it and add 30: 20 °C → 40 + 30 = 70 °F (close enough for weather).
Questions
What is -18 °C in Fahrenheit?
-18 degrees Celsius is -0.4 degrees Fahrenheit, or -0.4 °F rounded to one decimal place.
How do you convert degrees Celsius to degrees Fahrenheit?
Use -18 × 9/5 + 32, which gives -0.4. For a quick estimate: Double it and add 30: 20 °C → 40 + 30 = 70 °F (close enough for weather).
Is -18 °C hot or cold?
-18 °C is -0.4 °F: bitterly cold, below the temperature of a home freezer.
What is -18 °F in Celsius?
Going the other way, -18 °F is -27.8 °C. The reverse conversion has its own page and converter.
Is the answer exact?
Yes. -18 °C converts to exactly -0.4 °F; the rounded figure is only for convenience.