Delisle to Réaumur (°De → °Ré)
Formula
°De → kelvin → °RéConversion Table
| °De | °Ré |
|---|---|
| 0 | 80.000 |
| 1.0000 | 79.467 |
| 2.0000 | 78.933 |
| 3.0000 | 78.400 |
| 4.0000 | 77.867 |
| 5.0000 | 77.333 |
| 6.0000 | 76.800 |
| 7.0000 | 76.267 |
| 8.0000 | 75.733 |
| 9.0000 | 75.200 |
| 10.000 | 74.667 |
| 11.000 | 74.133 |
| 12.000 | 73.600 |
| 13.000 | 73.067 |
| 14.000 | 72.533 |
| 15.000 | 72.000 |
| 16.000 | 71.467 |
| 17.000 | 70.933 |
| 18.000 | 70.400 |
| 19.000 | 69.867 |
| °De | °Ré |
|---|---|
| 20.000 | 69.333 |
| 21.000 | 68.800 |
| 22.000 | 68.267 |
| 23.000 | 67.733 |
| 24.000 | 67.200 |
| 25.000 | 66.667 |
| 26.000 | 66.133 |
| 27.000 | 65.600 |
| 28.000 | 65.067 |
| 29.000 | 64.533 |
| 30.000 | 64.000 |
| 31.000 | 63.467 |
| 32.000 | 62.933 |
| 33.000 | 62.400 |
| 34.000 | 61.867 |
| 35.000 | 61.333 |
| 36.000 | 60.800 |
| 37.000 | 60.267 |
| 38.000 | 59.733 |
| 39.000 | 59.200 |
| °De | °Ré |
|---|---|
| 40.000 | 58.667 |
| 41.000 | 58.133 |
| 42.000 | 57.600 |
| 43.000 | 57.067 |
| 44.000 | 56.533 |
| 45.000 | 56.000 |
| 46.000 | 55.467 |
| 47.000 | 54.933 |
| 48.000 | 54.400 |
| 49.000 | 53.867 |
| 50.000 | 53.333 |
| 51.000 | 52.800 |
| 52.000 | 52.267 |
| 53.000 | 51.733 |
| 54.000 | 51.200 |
| 55.000 | 50.667 |
| 56.000 | 50.133 |
| 57.000 | 49.600 |
| 58.000 | 49.067 |
| 59.000 | 48.533 |
| °De | °Ré |
|---|---|
| 60.000 | 48.000 |
| 61.000 | 47.467 |
| 62.000 | 46.933 |
| 63.000 | 46.400 |
| 64.000 | 45.867 |
| 65.000 | 45.333 |
| 66.000 | 44.800 |
| 67.000 | 44.267 |
| 68.000 | 43.733 |
| 69.000 | 43.200 |
| 70.000 | 42.667 |
| 71.000 | 42.133 |
| 72.000 | 41.600 |
| 73.000 | 41.067 |
| 74.000 | 40.533 |
| 75.000 | 40.000 |
| 76.000 | 39.467 |
| 77.000 | 38.933 |
| 78.000 | 38.400 |
| 79.000 | 37.867 |
Delisle to Réaumur Conversion
Converting Delisle (°De) to Réaumur (°Ré) is a common temperature conversion. 1 °De equals 79.466667 °Ré. For example, 100 °De is equal to 26.666667 °Ré.
Quick Mental Math: Delisle to Réaumur
Divide by 1.88 to convert delisle to reaumur.
Why is converting Delisle to Réaumur tricky?
The conversion factor requires careful attention to avoid reversing the operation.
Reference Temperatures
Absolute zero: 559.725 °De = -218.52 °Ré. Water freezing point: 150 °De = 0 °Ré. Room temperature: 120 °De = 16 °Ré. Body temperature: 94.5 °De = 29.6 °Ré. Water boiling point: 0 °De = 80 °Ré.
What is Delisle?
Delisle (°De) is a unit of temperature. The Delisle scale measures temperature with zero at the boiling point of water and increasing values downward. One degree Delisle equals 2/3 of a degree Celsius, making it inversely proportional to Celsius. This scale is now mostly historical and not used in modern thermometry [cgpm-resolutions]. Invented by Joseph-Nicolas Delisle in 1732, the scale was devised for scientific observations in Russia. It fixed 0 °De at 100 °C (water boiling point) and increased toward freezing point, opposite to Celsius. The scale fell out of use in favor of Celsius and Kelvin as international standards emerged [cgpm-resolutions]. The Delisle scale is obsolete and retained only in historical scientific texts and specialized archival references. Modern temperature measurements universally use Celsius, Fahrenheit, or Kelvin. Organizations like BIPM do not recognize Delisle for current temperature calibration [bipm-si-brochure].
What is Réaumur?
Réaumur (°Ré) is a unit of temperature. The Réaumur scale is a temperature scale where water freezes at 0 °Ré and boils at 80 °Ré at standard atmospheric pressure. Each degree Réaumur corresponds to 1.25 degrees Celsius. The scale was historically used in Europe but is now mostly obsolete and replaced by Celsius and Kelvin [cgpm-resolutions]. René Antoine Ferchault de Réaumur introduced the scale in 1730 to simplify temperature measurement using alcohol thermometers. It was widely used in France and parts of Europe until the 19th century before being supplanted by the Celsius scale [cgpm-resolutions]. Today, the Réaumur scale has limited use and appears mainly in historical or academic contexts. Some traditional cheese-making regions in Europe may still reference it. Modern science and industry prefer Celsius or Kelvin in line with SI standards [cgpm-resolutions].
Common Misspellings
People often search for this conversion using these alternate spellings: Delislee, Delisleu, Delisell, Delislee scale, Delisle temperature, reaumer, reaumur, reaumur scale, réamer. All of these refer to the Delisle to Réaumur conversion.