Twenty-five degrees Celsius is equal to 77 degrees Fahrenheit. While online measurement converters are available, it is easy to find the answer mathematically. Multiply the Celsius temperature by 1.8, and then add 32 to arrive at the Fahrenheit equivalent.
To mathematically convert a Fahrenheit temperature to Celsius, subtract 32 and then multiply by .5556. It is helpful to remember a few equivalent temperatures from the two scales. For example, -40 degrees Celsius and -40 degrees Fahrenheit are the same temperature. Water freezes at 0 degrees Celsius and 32 degrees Fahrenheit, and it boils at 100 degrees Celsius and 212 degrees Fahrenheit. Average healthy body temperature is 37 degrees Celsius and 98.6 degrees Fahrenheit.