Convert Delisle to Rankine and Rankine to Delisle instantly. Bidirectional temperature converter with formula and common values.
To convert Delisle to Rankine, first convert to Kelvin by subtracting two-thirds of the Delisle value from 373.15, then multiply by 9/5. The Delisle scale is inverted: 0°De is boiling water, 150°De is freezing.
| °De | °R |
|---|---|
| 0 | 671.67 |
| 45 | 617.67 |
| 75 | 581.67 |
| 100 | 551.67 |
| 150 | 491.67 |
| 200 | 431.67 |
| 300 | 311.67 |
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First convert Delisle to Kelvin using K = 373.15 − °De × 2/3, then multiply by 9/5 to get Rankine. For example, 45°De: (373.15 − 45 × 2/3) × 9/5 = 617.67°R.
The Delisle scale was invented by Joseph-Nicolas Delisle in 1732. It runs in reverse: higher Delisle values mean colder temperatures. Water boils at 0°De and freezes at 150°De.
0°De (the boiling point of water) equals 671.67°R.
Delisle originally measured the contraction of mercury from the boiling point of water. As temperature drops, mercury contracts more, giving higher readings. This reverse convention was kept.