Convert Fahrenheit to Delisle
Convert Fahrenheit (°F) to Delisle (°De) instantly and accurately.
Conversion Formula
°De = (212 − °F) × 5/6
About Fahrenheit
Fahrenheit (°F) was developed by German physicist Daniel Gabriel Fahrenheit in 1724 and remains the primary temperature scale in the United States, Belize, and the Cayman Islands. Water freezes at 32°F and boils at 212°F at standard atmospheric pressure. For Americans, common references include: room temperature (68-72°F), body temperature (98.6°F), and a hot summer day (90-100°F). The scale was originally based on the lowest temperature Fahrenheit could create with ice and salt (-17.8°C or 0°F).
About Delisle
Delisle (°De) was created by French astronomer Joseph-Nicolas Delisle in 1732 and used in Russia for nearly a century before metrication. Uniquely, the scale is inverted: it increases as temperature decreases. Water boils at 0°De and freezes at 150°De - the opposite of Celsius. Delisle calibrated his mercury thermometer against the boiling point of water, assigning it zero. The scale was adopted by the Russian Academy of Sciences and used by astronomers and naturalists across the Russian Empire throughout the 18th century. It still appears in historical scientific records from that era.
Quick Reference Table
| Fahrenheit (°F) | Delisle (°De) |
|---|---|
| -40 °F | 210 °De |
| 32 °F | 150 °De |
| 68 °F | 120 °De |
| 98.6 °F | 94.5 °De |
| 212 °F | 0 °De |
| 392 °F | -150 °De |