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Conversions

Celsius to Delisle Converter.

Converts a temperature from degrees Celsius to degrees Delisle, a historical temperature scale where water boils at 0 °De and freezes at 150 °De.

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Your inputs

How it works

  1. 1

    Enter the temperature in degrees Celsius.

  2. 2

    Subtract the Celsius value from 100.

  3. 3

    Multiply the result by 1.5 to get degrees Delisle.

(100 - celsius) * 1.5

Frequently asked questions

What is the Delisle scale?

The Delisle scale (°De) is a historical temperature scale where water boils at 0 °De and freezes at 150 °De. It was invented by French astronomer Joseph-Nicolas Delisle in 1732.

How do I convert Delisle back to Celsius?

To convert from Delisle to Celsius, use the formula: °C = 100 - (°De / 1.5). For example, 50 °De equals 100 - (50/1.5) ≈ 66.67 °C.

Why is the conversion factor 1.5?

The Delisle scale divides the interval between boiling and freezing (100 °C) into 150 degrees, so each degree Delisle is 2/3 of a degree Celsius. Thus, °De = (100 - °C) × 1.5.

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Temperature in Delisle

112.5°De

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How it works

Converts a temperature from degrees Celsius to degrees Delisle, a historical temperature scale where water boils at 0 °De and freezes at 150 °De.

  1. Enter the temperature in degrees Celsius.
  2. Subtract the Celsius value from 100.
  3. Multiply the result by 1.5 to get degrees Delisle.

Formulas

The math behind this calculator, written out so you can verify the result.

Celsius to Delisle

°De = (100 - °C) × 1.5

Subtract the Celsius temperature from 100 (the boiling point of water in Delisle) and multiply by 1.5 to account for the scale difference.

Example:

Input: °C = 20

Calculation: (100 - 20) × 1.5 = 80 × 1.5

Result: 120 °De

Real-world use cases

Where this calculation shows up in everyday life.

Historical research

Convert temperatures from historical scientific records that used the Delisle scale.

Example: Reading a 1730s thermometer reading of 80 °De.

Educational demonstrations

Teach students about alternative temperature scales and their relationships.

Example: Showing that 0 °C equals 150 °De.

Curiosity and comparison

Understand how different scales represent the same physical temperature.

Example: Comparing a typical room temperature of 22 °C to its Delisle value.

Tips and common mistakes

Tips

  • Remember that the Delisle scale is inverted: higher Celsius means lower Delisle.
  • For quick mental estimates, each 10 °C change corresponds to a 15 °De change.
  • Use the formula °De = (100 - °C) × 1.5 for exact conversions.
  • The freezing point of water is 150 °De, and the boiling point is 0 °De.

Common Mistakes to Avoid

  • Forgetting to subtract from 100 first; the formula is not simply °C × 1.5.
  • Confusing the direction: a higher Celsius value gives a lower Delisle value.
  • Using the wrong factor; it's 1.5, not 1.8 (which is for Fahrenheit).

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.