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Delisle Converters

Convert temperatures between Delisle and other temperature scales (Celsius, Fahrenheit, Kelvin).

What this tool does

Convert temperatures between Delisle and other temperature scales (Celsius, Fahrenheit, Kelvin). Type an amount in degrees Delisle, choose the units, and the tool converts it to degrees Celsius. It offers 4 temperature units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Degree Delisle, Degree Celsius, Degree Fahrenheit, Kelvin. Starts as Degree Delisle.
  • To: Choose one of the same 4 units as "From". Starts as Degree Celsius.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from degrees Delisle to degrees Celsius:

  • 1 °De ≈ 99.333333 °C
  • 5 °De ≈ 96.666667 °C
  • 10 °De ≈ 93.333333 °C
  • 50 °De ≈ 66.666667 °C
  • 100 °De ≈ 33.333333 °C

Multiply the number of degrees Delisle by -0.6666666667, then add 100, to get degrees Celsius. The formula follows from exact definitions. -0.6666666667 has more digits than fit here, so it is shown rounded.

Sources: Degree Delisle: Delisle scale. Degree Celsius: SI Brochure, 9th edition (2019).

Limitations

  • Converts a temperature reading only. A temperature difference, such as a rise of 10 degrees, converts differently because it has no offset.
  • Nothing below absolute zero is accepted.
  • Delisle is a historical scale, rarely used today.

FAQs

Q: How do I convert Delisle to Celsius?
A: Subtract the Delisle value from 150 and multiply by 2/3. In this scale water boils at 0 °De and freezes at 150 °De.
Q: Why do Delisle values fall as it gets hotter?
A: The scale was defined with boiling water at zero and freezing water at 150, so higher temperatures give lower numbers and very cold temperatures give large positive ones.
Q: What is 100 °C in Delisle?
A: 0 °De. The scale puts its zero at the boiling point of water.

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