Reaumur is a historical temperature scale.
Reaumurs to Delisles Converter — Re to De
Convert Reaumur (Re) to Delisle (De) using the exact temperature formula. See the formula, worked examples, and conversion table.
Reaumurs to Delisles converter
Converter
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Reaumur, and Romer.
Context values
Some unit families need one extra value for a physically accurate result.
Delisle is a historical temperature scale.
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
Temperature conversion uses Kelvin as the intermediate absolute scale.
Reserved above the conversion cards and below the converter.
About Converting Reaumurs to Delisles
Reaumur and Delisle are both historical temperature scales no longer in everyday use — this conversion is mainly useful for historical reference or comparing older scientific texts against each other.
Formula
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
Both scales are converted through Kelvin as a common absolute reference point.
Simple example
(0 − 32) × 5/9 = 150 °C
0 reaumurs = 150 delisles.
Real-world example
(0 − 32) × 5/9 = 150 °C
0 reaumurs = 150 delisles.
Conversion table
| Reaumur (Re) | Delisle (De) |
|---|---|
| -40 Re | 225 De |
| -20 Re | 187.5 De |
| 0 Re | 150 De |
| 20 Re | 112.5 De |
| 37 Re | 80.625 De |
| 100 Re | -37.5 De |
Reverse conversion: Delisle to Reaumur
(148.125 − 32) × 5/9 = 1 °C
148.125 delisles = 1 reaumur.
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
For a page dedicated to this direction, see Delisle to Reaumur.
Understanding the Reaumur (Re)
Reaumur is a historical temperature scale.
Understanding the Delisle (De)
Delisle is a historical temperature scale.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many delisles are in 1 reaumur?
1 reaumur equals 148.125 delisles, using the offset temperature formula rather than an estimate.
How do I convert reaumur to delisle?
Use the formula shown above: it involves both a multiplication and an addition/subtraction because the two scales don't share a common zero point.
How do I convert delisle back to reaumur?
Use the reverse factor: 1 delisle equals 79.46666667 reaumurs. You can also use the swap control in the converter above to flip the direction instantly.
What is a reaumur?
Reaumur (Re) is a unit of temperature.
What is a delisle?
Delisle (De) is a unit of temperature.
Is the Reaumur to Delisle conversion exact?
Yes. Both scales are formally defined relative to the Kelvin scale, so the conversion formula is exact — the only rounding involved is in how many decimal places you choose to display.