Need to convert Celsius to Fahrenheit, or vice versa? If you travel a lot internationally, it’s a necessary skill. This easy Celsius to Fahrenheit trick will teach you how to convert Celsius to Fahrenheit in your head.
Easy Celsius To Fahrenheit Trick
Here’s an easy Celsius to Fahrenheit trick: Double the Celsius degrees and then add 30 to get an approximate Fahrenheit temperature. For example, the formula to convert 12 degrees Celsius to Fahrenheit would be (12*2) + 30 = 54. This trick works in reverse too. Just subtract 30 from the Fahrenheit and divide by 2. So to convert 80º F to Celsius, the formula would be (80-30) ÷ 2 = 10º C.
Go ahead and try it out.
Celsius To Fahrenheit Calculator
Here’s a Celsius to Fahrenheit calculator to test your math. Just enter a number in either one of the Celsius or Fahrenheit fields below, then click outside the text box to complete the calculation.

Frank Wilson is a retired teacher with over 30 years of combined experience in the education, small business technology, and real estate business. He now blogs as a hobby and spends most days tinkering with old computers. Wilson is passionate about tech, enjoys fishing, and loves drinking beer.
“So to convert 80º F to Celsius, the formula would be (80-30) ÷ 2 = 10º C.” This is from the article and although
I think that it is just a typo, you may want to fix it.