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Delisle to Réaumur Calculator



How to use this Delisle to Réaumur Calculator 🤔

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

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


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

Réaumur = (80 - Delisle) * 8 / 15


Calculation will be done after you enter a valid input.


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.


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.