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Réaumur to Celsius (°Ré to °C) Converter

1 °Ré = 1.25 °C

1 Réaumur equals 1.25 Celsius (1 °Ré = 1.25 °C). Convert Réaumur to Celsius with formula, table, and examples.

To convert Réaumur to Celsius, multiply by 5/4 (or 1.25). This reverses the Celsius-to-Réaumur conversion and is needed when interpreting historical European temperature records from the 18th and 19th centuries, particularly from Germany, France, and Russia.

How to Convert Réaumur to Celsius

°C = °Ré × 5/4
Formula: Réaumur to Celsius
  1. Take your Réaumur value
  2. Multiply by 5/4 (or 1.25)
  3. Read the result in Celsius

Common Réaumur to Celsius Conversions

Réaumur (°Ré) Celsius (°C) Status
-30 °Ré -37.5 °C
-20 °Ré -25 °C
-10 °Ré -12.5 °C
0 °Ré 0 °C
5 °Ré 6.25 °C
10 °Ré 12.5 °C
15 °Ré 18.75 °C
20 °Ré 25 °C
25 °Ré 31.25 °C
30 °Ré 37.5 °C
40 °Ré 50 °C
50 °Ré 62.5 °C
60 °Ré 75 °C
70 °Ré 87.5 °C
80 °Ré 100 °C
100 °Ré 125 °C
200 °Ré 250 °C

Good to Know About Réaumur to Celsius Conversion

German weather diaries and agricultural records from the 1700s-1800s use Réaumur. Climate historians studying the Little Ice Age in Central Europe regularly need this conversion.

Réaumur to Celsius: What You Need to Know

A Réaumur reading of 16°Ré equals 20°C. Body temperature at 29.6°Ré equals 37°C. Historical German weather observations from the Kaiserzeit were often recorded in Réaumur and must be multiplied by 1.25 for modern Celsius equivalents.

What is a Réaumur? °Ré

A historical temperature scale where water freezes at 0 °Ré and boils at 80 °Ré. Named after René Antoine Ferchault de Réaumur. Once widely used in Europe.

Historical historical cheese making European history
Learn more about Réaumur →

What is a Celsius? °C

A metric temperature scale where 0°C is the freezing point and 100°C is the boiling point of water. Used worldwide except in the US.

Metric weather cooking science
Learn more about Celsius →

Going the other way? Use our Celsius to Réaumur converter.

Réaumur to Celsius FAQ

  • The formula is: °C = °Ré × 5/4. For example, 32°Ré: 32 × 5/4 = 40°C. Each Réaumur degree equals 1.25 Celsius degrees.

  • 80°Ré equals exactly 100°C - the boiling point of water. The Réaumur scale divides the freezing-to-boiling range into 80 degrees rather than 100.

  • The Réaumur scale was widely used in Germany from the mid-18th century through the late 19th century. It was gradually replaced by Celsius during German metrication.

Non-Frequently Asked Questions About Réaumur to Celsius

Questions nobody should ask - but someone did.

  • No. Rene Antoine Ferchault de Reaumur was a French scientist who created his temperature scale in 1730. His scale sets 0 at freezing and 80 at boiling. It was popular in France and Germany until Celsius took over. Reaumur also studied insects, which has nothing to do with temperature but is interesting.

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Need the reverse? Use our Celsius to Réaumur converter. See all Temperature converters.