Celsius
Degrees Celsius is a temperature scale with water freezing at 0 °C and boiling at 100 °C; Fahrenheit converts as (C × 9/5) + 32.
Also called centigrade, °C, degrees Celsius
Celsius is the everyday scale in most of the world. Fahrenheit remains common in the United States, and Kelvin starts at absolute zero — 0 K is −273.15 °C.
Converting is exact arithmetic, not estimation. Multiply by 1.8 and add 32 for Fahrenheit; subtract 32 and divide by 1.8 to come back. 180 °C becomes 356 °F.
For cooking, gas marks and fan-forced ovens add their own offsets, so a recipe written for a conventional oven may need about 20 °C less in a fan oven. Oven temperatures and body temperatures are quoted in Celsius almost everywhere outside the US.
Common questions
How do I convert Celsius to Fahrenheit quickly?
Double it and add 30 for a rough figure. The exact conversion is C × 1.8 + 32, so 180 °C is 356 °F.
Is centigrade the same as Celsius?
Yes. Centigrade was the older name for the same scale and was replaced by Celsius in 1948.