How this calculator works
In modern temperature reporting, centigrade is the older name for the Celsius scale. The CIPM selected the name degree Celsius in 1948. A modern centigrade reading therefore keeps the same number in Celsius. This is a naming conversion, not a change of temperature scale; an original historical thermometer may require separate calibration.
Formula
degrees Celsius = degrees centigrade; kelvin = degrees Celsius + 273.15.
Worked example
A modern reading of 22 degrees centigrade is 22 °C and 295.15 K. A reading of -40 degrees centigrade is -40 °C.
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Frequently asked questions
Is there a conversion factor?
The factor is exactly one, with no offset between the modern names.
Why use Celsius instead of centigrade?
Celsius is the adopted name in international metrology and the standard name used with the symbol °C.
Can modern centigrade be below zero?
Yes. Negative Celsius readings are valid down to absolute zero at -273.15 °C. This converter rejects values below that limit.