Celsius to Réaumur (°C to °Ré) Converter
1 Celsius equals 0.8 Réaumur (1 °C = 0.8 °Ré). Convert Celsius to Réaumur with formula, table, and examples.
To convert Celsius to Réaumur, multiply by 4/5. The Réaumur scale sets water's freezing point at 0°Ré and boiling point at 80°Ré. Once widely used in continental Europe, it is now nearly obsolete, surviving only in a few traditional cheese-making and dairy processes.
How to Convert Celsius to Réaumur
- Take your Celsius value
- Multiply by 4/5 (or 0.8)
- Read the result in Réaumur
Common Celsius to Réaumur Conversions
| Celsius (°C) | Réaumur (°Ré) | Status |
|---|---|---|
| -40 °C | -32 °Ré | |
| -20 °C | -16 °Ré | |
| -10 °C | -8 °Ré | |
| 0 °C | 0 °Ré | |
| 5 °C | 4 °Ré | |
| 10 °C | 8 °Ré | |
| 15 °C | 12 °Ré | |
| 20 °C | 16 °Ré | |
| 25 °C | 20 °Ré | |
| 30 °C | 24 °Ré | |
| 36 °C | 28.8 °Ré | |
| 37 °C | 29.6 °Ré | |
| 40 °C | 32 °Ré | |
| 50 °C | 40 °Ré | |
| 60 °C | 48 °Ré | |
| 80 °C | 64 °Ré | |
| 100 °C | 80 °Ré | |
| 150 °C | 120 °Ré | |
| 180 °C | 144 °Ré | |
| 200 °C | 160 °Ré | |
| 220 °C | 176 °Ré | |
| 250 °C | 200 °Ré | |
| 300 °C | 240 °Ré | |
| 500 °C | 400 °Ré | |
| 1,000 °C | 800 °Ré |
Good to Know About Celsius to Réaumur Conversion
The Réaumur scale was used in Germany longer than in France, even though a Frenchman invented it. German meteorological records from the 18th and 19th centuries often require Réaumur-to-Celsius conversion for modern analysis.
Celsius to Réaumur: What You Need to Know
Room temperature of 20°C equals 16°Ré. Body temperature (37°C) is 29.6°Ré. Boiling water (100°C) is 80°Ré. The Réaumur scale was the dominant temperature scale in Germany and France during the 18th and 19th centuries before Celsius replaced it.
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.
Learn more about Celsius →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.
Learn more about Réaumur →Going the other way? Use our Réaumur to Celsius converter.
Celsius to Réaumur FAQ
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The Réaumur scale survives only in niche applications, primarily in traditional cheese-making and dairy processes in parts of Switzerland and Italy. Some old recipes specify curdling temperatures in Réaumur.
Non-Frequently Asked Questions About Celsius to Réaumur
Questions nobody should ask - but someone did.
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Reaumur calibrated his thermometer with the expansion of alcohol mixed with water. The 80-degree range was not chosen for mathematical elegance - it was simply what his thermometer showed. Sometimes science is just 'that is what the instrument said.'
Related Articles About Celsius to Réaumur
Need the reverse? Use our Réaumur to Celsius converter. See all Temperature converters.