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Réaumur to Delisle Calculator



How to use this Réaumur to Delisle Calculator 🤔

Follow these steps to convert given Réaumur value from Réaumur units to Delisle units.

  1. Enter the input Réaumur value in the text field.
  2. The Delisle is calculated in realtime ⌚ using the formula, and displayed under the Delisle label.
  3. You may copy the resulting Delisle using the Copy button.


To convert given temperature from Réaumur to Delisle, use the following formula.

Delisle = (80 - Réaumur) * 15 / 8


Calculation will be done after you enter a valid input.


The Réaumur scale is a temperature scale developed by the French scientist René Antoine Ferchault de Réaumur. On this scale, the freezing point of water is 0 degrees, and the boiling point is 80 degrees under standard atmospheric pressure. While not as widely used as Celsius or Fahrenheit, the Réaumur scale was historically employed in some European countries for scientific and industrial purposes.


The Delisle scale, proposed by the French astronomer Joseph-Nicolas Delisle, is a temperature scale where the freezing point of water is 150 degrees and the boiling point is 0 degrees under standard atmospheric pressure. The Delisle scale is unique in that its values decrease as temperature increases, making it less common in contemporary usage compared to other temperature scales.