The formula for converting Celsius to Fahrenheit is F = 9/5 (C + 32). This means to convert from Celsius to Fahrenheit, it is necessary to add 32 to the value for degrees Celsius, then multiply the quantity by 9 and divide it by 5.
To convert from Fahrenheit to Celsius, simply reverse the formula. Subtract 32 from the value for degrees Fahrenheit, then multiply the quantity by 5 and divide it by 9. Both scales have been around since the 1700s. The Celsius scale is also sometimes referred to as the centrigrade scale, because it divides the interval between the freezing and boiling points of water into 100 units.