Convert Réaumur to Celsius

Convert Réaumur (°Ré) to Celsius (°C) instantly and accurately.

Conversion Formula

°C = °Ré × 5/4

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.

About Celsius

Celsius (°C) is the most widely used temperature scale worldwide, named after Swedish astronomer Anders Celsius (1742). It's based on the freezing point of water at 0°C and boiling point at 100°C under standard atmospheric pressure (1 atmosphere). This makes it intuitive for daily use: room temperature is around 20-22°C, body temperature is 37°C, and a hot summer day might reach 35-40°C. It's the standard in science, medicine, and weather reporting in most countries.

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