-18f to c

Step 1: Identify the conversion factor

The conversion factor from fahrenheit to celsius is:

1 fahrenheit = 1.543 celsius

Step 2: Set up the calculation

To convert -18 fahrenheit to celsius, multiply -18 by the conversion factor 1.543:

-18×1.543

Step 3: Calculate

-18×1.543=-27.778

Step 4: Round the result

The result is approximately: -28 celsius

Final Answer:

-18 fahrenheit is approximately -28 celsius.