Rankine is an absolute Fahrenheit-based temperature scale.
Rankines to Delisles Converter — R to De
Convert Rankine (R) to Delisle (De) using the exact temperature formula. See the formula, worked examples, and conversion table.
Rankines 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 Rankines to Delisles
Rankine and Delisle are both historical temperature scales no longer in everyday use — this conversion is mainly useful for historical reference or comparing older scientific texts against each other.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 = 559.725 °C
0 rankines = 559.725 delisles.
Real-world example
(0 − 32) × 5/9 = 559.725 °C
0 rankines = 559.725 delisles.
Conversion table
| Rankine (R) | Delisle (De) |
|---|---|
| -40 R | 593.0583333 De |
| -20 R | 576.3916667 De |
| 0 R | 559.725 De |
| 20 R | 543.0583333 De |
| 37 R | 528.8916667 De |
| 100 R | 476.3916667 De |
Reverse conversion: Delisle to Rankine
(558.8916667 − 32) × 5/9 = 0.99999996 °C
558.8916667 delisles = 0.99999996 rankines.
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
For a page dedicated to this direction, see Delisle to Rankine.
Understanding the Rankine (R)
Rankine is an absolute Fahrenheit-based 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 rankine?
1 rankine equals 558.8916667 delisles, using the offset temperature formula rather than an estimate.
How do I convert rankine 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 rankine?
Use the reverse factor: 1 delisle equals 670.47 rankines. You can also use the swap control in the converter above to flip the direction instantly.
What is a rankine?
Rankine (R) is a unit of temperature.
What is a delisle?
Delisle (De) is a unit of temperature.
Is the Rankine 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.