# Delisle to Celsius (°De to °C)

Source: https://www.unitconvertercalculator.com/temperature/delisle-to-celsius/

To convert Delisle to Celsius, subtract the Delisle value from 150 and multiply by 2/3. The Delisle scale runs in reverse, so this conversion 'un-reverses' it back to the familiar Celsius scale. This is needed when interpreting historical Russian temperature records from the 18th century.

## Formula

°C = 100 − °De × 2/3

## Conversion Table

| Delisle (°De) | Celsius (°C) |
|---|---|
| 0 °De | 100 °C |
| 50 °De | 66.66666666667 °C |
| 100 °De | 33.33333333333 °C |
| 150 °De | 0 °C |
| 200 °De | -33.33333333333 °C |
| 250 °De | -66.66666666667 °C |
| 300 °De | -100 °C |
| 350 °De | -133.33333333333 °C |
| 400 °De | -166.66666666667 °C |
| 500 °De | -233.33333333333 °C |
| 559 °De | -272.66666666667 °C |

## Units

### Delisle (°De)

A historical inverted temperature scale invented by Joseph-Nicolas Delisle in 1732. Water boils at 0 °De and freezes at 150 °De. Higher numbers mean colder temperatures.

### Celsius (°C)

A metric temperature scale where 0°C is the freezing point and 100°C is the boiling point of water. Used worldwide except in the US.

## Background

A Delisle reading of 120°De equals 20°C (room temperature). 150°De equals 0°C (freezing), and 0°De equals 100°C (boiling). Historical Russian meteorological data from the 1730s-1790s was recorded in Delisle and requires this conversion for modern climate studies.

## Good to Know

Russian scientists used the Delisle scale for about 60 years (1732-1790). Historical climate research on 18th-century Russia requires understanding this backwards-running scale.

## FAQ

### What is the formula for Delisle to Celsius?

The formula is: °C = 100 − °De × 2/3. For example, 120°De: 100 − 120 × 2/3 = 100 − 80 = 20°C.

### What is 150°De in Celsius?

150°De equals exactly 0°C - the freezing point of water.

### What is 0°De in Celsius?

0°De equals exactly 100°C - the boiling point of water. Remember, the Delisle scale runs backwards.

## Non-Frequently Asked Questions

### Is Delisle a French dessert?

No, though Joseph-Nicolas Delisle was French. He created his temperature scale in 1732 for Russian weather observations. The scale runs backwards: 0 is boiling, and higher numbers are colder. It is the only temperature scale optimized for Russian pessimism about winter.

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## See Also

- [Celsius to Delisle](https://www.unitconvertercalculator.com/temperature/celsius-to-delisle/)