Celsius
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Celsius is a temperature scale in the metric system. The scale was originally defined such that at standard atmospheric pressure water freezes at 0 ºC and boils at 100 ºC. To convert from Fahrenheit to Celsius take the Fahrenheit temperature, subtract 32 then multiply by 5 and divide by 9.
One Celsius degree is equal to one Kelvin, with an offset such that T(°C) = T(K) - 273,15
Celsius is the commonly used unit of temperature in Europe, but in the United States, Fahrenheit is still preferred. Centigrade was a term commonly used as a synonym of Celsius in the past.