Fahrenheit and Celsius are the units of temperature in U.S. and metric systems respectively. Note that the term Celsius has replaced the term Centigrade.
Estimate Celsius: subtract Fahrenheit degrees by 32 and divide by two.
Estimate Fahrenheit: multiply Celsius degrees by two and add 32.
Here are some familiar points on the scale:
Water freezes: 0 degrees Celsius, or 32 degrees Fahrenheit
Water boils: 100 degrees Celsius, or 212 degrees Fahrenheit
Normal body temperature: 37 degrees Celsius, or 98.6 degrees Fahrenheit
Comfortable room temperature: 20-25 degrees Celsius, or 68-77 degrees Fahrenheit
Fahrenheit and Celsius are the units of temperature in U.S. and metric systems respectively. Note that the term Celsius has replaced the term Centigrade. 
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