Convert Kelvin to Réaumur

Convert Kelvin (K) to Réaumur (°Ré) instantly and accurately.

Conversion Formula

°Ré = (K − 273.15) × 4/5

About Kelvin

Kelvin (K) is the base unit of thermodynamic temperature in the International System of Units (SI), named after British physicist Lord Kelvin (William Thomson). It starts at absolute zero (0 K = -273.15°C), the theoretical point where all molecular motion ceases. Unlike other scales, Kelvin uses no degree symbol. This scale is essential in physics, chemistry, and astronomy: room temperature is about 295 K, water freezes at 273.15 K, and the Sun's surface is approximately 5,778 K. It's used in scientific calculations because it's directly proportional to molecular kinetic energy.

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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