Convert Delisle to Rankine

Convert Delisle (°De) to Rankine (°R) instantly and accurately.

Conversion Formula

°R = 671.67 − °De × 6/5

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.

About Rankine

Rankine (°R) is an absolute temperature scale named after Scottish engineer William John Macquorn Rankine. Like Kelvin, it starts at absolute zero (0°R = -459.67°F = 0 K), but uses Fahrenheit-sized degree intervals instead of Celsius-sized ones. It's primarily used in engineering applications in the United States, particularly in thermodynamics and steam power calculations. For reference: water freezes at 491.67°R, room temperature is about 530°R, and water boils at 671.67°R. The relationship is simple: °R = °F + 459.67.

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