# How to Easily Convert from Celsius to Fahrenheit and Vice Versa

I spent extended time in the US and have many friends and coworkers there. My friends and I always found the Celsius/Fahrenheit conversion confusing. The calculation itself isn’t exactly straight forward. The formula to convert from Celsius to Fahrenheit is the following:

Temperature_F = Temperature_C*(5/9) + 32

Recently, I learned a neat trick for converting between the two. If you’re converting between Celsius to Fahrenheit, multiply by 2 and add 30. For example, if it’s 20 degrees Celsius:

(20*2)+30 = 70

Thus, 20 degrees celsius is approximately 70 degrees fahrenheit.

If you’re converting from Fahrenheit to Celsius, do the opposite, subtract by 30 and divide by 2. For example, let’s calculate 100 degrees fahrenheit:

(100-30)/2 = 35

So 100 degrees fahrenheit is 35 degrees celsius.