Convert Rømer to Réaumur

Convert Rømer (°Rø) to Réaumur (°Ré) instantly and accurately.

Conversion Formula

°Ré = (°Rø − 7.5) × 32/21

About Rømer

Rømer (°Rø) was designed by Danish astronomer Ole Christensen Rømer in 1701, making it one of the earliest calibrated temperature scales using two fixed points. It sets water's freezing point at 7.5°Rø and boiling point at 60°Rø; the offset of 7.5 at freezing was chosen to avoid negative numbers during the coldest Danish winters. In 1708, Daniel Gabriel Fahrenheit visited Rømer and was directly inspired by his thermometer design to create the Fahrenheit scale. Body temperature on the Rømer scale is approximately 22.5°Rø. Though now obsolete, Rømer's scale holds an important place in thermometric history.

About Réaumur

Réaumur (°Ré) was developed by French scientist René Antoine Ferchault de Réaumur in 1730 and was widely used across Europe until the 19th century. The scale sets water's freezing point at 0°Ré and boiling point at 80°Ré, creating a more compressed scale than Celsius. While largely obsolete today, it's still occasionally used in specific industries like cheese-making, brewing, and candy production in some European countries. For perspective: room temperature is about 16°Ré, body temperature is roughly 30°Ré, and a hot summer day reaches 32°Ré. The conversion is straightforward: °Ré = °C × 4/5.

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