The Celsius scale is used by scientists to measure temperature. The scale was originally defined such that at standard atmospheric pressure water freezes at 0 °C and boils at 100 °C. To convert from Fahrenheit to Celsius take the Fahrenheit temperature, subtract 32 then multiply by 5 and divide by 9.
Centigrade is a term commonly used as a synonym of Celsius (it was the original term used before the scale was renamed to honor its founder), especially when giving weather temperature on the air.
To convert Celsius to and from Fahrenheit, use the following equations:
Fahrenheit degrees = (Celsius degrees × 9⁄5) + 32
Celsius degrees = (Fahrenheit degrees - 32) × 5/9
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-  CIA World Factbook