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Some key temperatures relating the Celsius scale to other temperature scales are shown in the table below.
| Kelvin | Celsius | Fahrenheit | Rankine | |
| Absolute zero (precisely, by definition) |
0 K | −273.15 °C | −459.67 °F | 0 °R |
| Melting point of ice
(approximate) [1] |
273.15 K | 0 °C | 32 °F | 491.67 °R |
| Water’s triple point (precisely, by definition) |
273.16 K | 0.01 °C | 32.018 °F | |
| Water's boiling point
(approximate) [2] |
373.1339 K | 99.9839 °C | 211.9710 °F | 671.641 °R |
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- ^ The ice point of purified water has been measured to be 0.000 089(10) degrees Celsius - see Magnum, B.W. (1995). "Reproducibility of the Temperature of the Ice Point in Routine Measurements" (PDF). Nist Technical Note. 1411. Retrieved 2007-02-11.
{{cite journal}}: Unknown parameter|month=ignored (help) - ^ For Vienna Standard Mean Ocean Water at one standard atmosphere (101.325 kPa) when calibrated solely per the two-point definition of thermodynamic temperature. Older definitions of the Celsius scale once defined the boiling point of water under one standard atmosphere as being precisely 100 °C. However, the current definition results in a boiling point that is actually 16.1 mK less. For more about the actual boiling point of water, see VSMOW in temperature measurement.