Réaumur to Celsius (ºRé to °C)

Celsius to Réaumur (Swap Units)


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Réaumur to Celsius formula

°C =
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More information: Celsius


The Réaumur scale also known as the "octogesimal division", is a temperature scale in which the freezing and boiling points of water are set to 0 and 80 degrees respectively. The scale is named after René Antoine Ferchault de Réaumur, who first proposed something similar in 1730.


Réaumur to Celsius formula

°C =


Although initially defined by the freezing point of water (and later the melting point of ice), the Celsius scale is now officially a derived scale, defined in relation to the Kelvin temperature scale.

Zero on the Celsius scale (0°C) is now defined as the equivalent to 273.15K, with a temperature difference of 1 deg C equivalent to a difference of 1K, meaning the unit size in each scale is the same. This means that 100°C, previously defined as the boiling point of water, is now defined as the equivalent to 373.15K.

The Celsius scale is an interval system but not a ratio system, meaning it follows a relative scale but not an absolute scale. This can be seen because the temperature interval between 20°C and 30°C is the same as between 30°C and 40°C, but 40°C does not have twice the air heat energy of 20°C.

A temperature difference of 1 deg C is the equivalent of a temperature difference 1.8°F.


Réaumur to Celsius table

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Réaumur Celsius
0ºRé 0.00°C
1ºRé 1.25°C
2ºRé 2.50°C
3ºRé 3.75°C
4ºRé 5.00°C
5ºRé 6.25°C
6ºRé 7.50°C
7ºRé 8.75°C
8ºRé 10.00°C
9ºRé 11.25°C
10ºRé 12.50°C
11ºRé 13.75°C
12ºRé 15.00°C
13ºRé 16.25°C
14ºRé 17.50°C
15ºRé 18.75°C
16ºRé 20.00°C
17ºRé 21.25°C
18ºRé 22.50°C
19ºRé 23.75°C
Réaumur Celsius
20ºRé 25.00°C
21ºRé 26.25°C
22ºRé 27.50°C
23ºRé 28.75°C
24ºRé 30.00°C
25ºRé 31.25°C
26ºRé 32.50°C
27ºRé 33.75°C
28ºRé 35.00°C
29ºRé 36.25°C
30ºRé 37.50°C
31ºRé 38.75°C
32ºRé 40.00°C
33ºRé 41.25°C
34ºRé 42.50°C
35ºRé 43.75°C
36ºRé 45.00°C
37ºRé 46.25°C
38ºRé 47.50°C
39ºRé 48.75°C
Réaumur Celsius
40ºRé 50.00°C
41ºRé 51.25°C
42ºRé 52.50°C
43ºRé 53.75°C
44ºRé 55.00°C
45ºRé 56.25°C
46ºRé 57.50°C
47ºRé 58.75°C
48ºRé 60.00°C
49ºRé 61.25°C
50ºRé 62.50°C
51ºRé 63.75°C
52ºRé 65.00°C
53ºRé 66.25°C
54ºRé 67.50°C
55ºRé 68.75°C
56ºRé 70.00°C
57ºRé 71.25°C
58ºRé 72.50°C
59ºRé 73.75°C