Celsius to Réaumur Converter
Convert Celsius (°C) to Réaumur (°Ré) instantly. 1 °C = 0.8 °Ré.
Temperature Converter
5 units available
1 °C = 0.8 °Ré
Formula:
°Ré = °C × 4/5With your value: 1 °C = 0.8 °Ré
Other Celsius to Réaumur conversions
Celsius to Réaumur Conversion Table
| Celsius (°C) | Réaumur (°Ré) |
|---|---|
| 0.5 | 0.4 |
| 1 | 0.8 |
| 2 | 1.6 |
| 5 | 4 |
| 10 | 8 |
| 15 | 12 |
| 20 | 16 |
| 25 | 20 |
| 50 | 40 |
| 100 | 80 |
| 250 | 200 |
| 500 | 400 |
| 1000 | 800 |
Réaumur to Celsius Conversion Table
| Réaumur (°Ré) | Celsius (°C) |
|---|---|
| 0.5 | 0.625 |
| 1 | 1.25 |
| 2 | 2.5 |
| 5 | 6.25 |
| 10 | 12.5 |
| 15 | 18.75 |
| 20 | 25 |
| 25 | 31.25 |
| 50 | 62.5 |
| 100 | 125 |
| 250 | 312.5 |
| 500 | 625 |
| 1000 | 1,250 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Celsius (°C)
Temperature
t/°C = T/K − 273.15. The degree Celsius has exactly the same magnitude as the kelvin.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Réaumur (°Ré)
Temperature
Traceable to the kelvin, defined by fixing the Boltzmann constant at 1.380 649 × 10⁻²³ J/K. Celsius and Fahrenheit are exact affine transforms of the kelvin scale.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Celsius to Réaumur
To convert from Celsius (°C) to Réaumur (°Ré), multiply the value by 0.8.
Formula: °Ré = °C × 4/5
Reverse: °C = °Ré × 5/4
Step-by-Step Example
- Start with your value in Celsius. For example: 5 °C
- Multiply by the conversion factor: 5 x 0.8
- The result is: 4 °Ré
About Celsius
The Celsius scale sets 0°C as the freezing point and 100°C as the boiling point of water at standard pressure. It is used by most countries worldwide.
Fun Fact: Anders Celsius originally proposed a scale where 100° was freezing and 0° was boiling—it was later reversed!
Common uses: weather, cooking, science.
About Réaumur
The Réaumur scale sets water's freezing point at 0 °Ré and its boiling point at 80 °Ré. It survives in a few European cheese and syrup recipes.
Common uses: historic recipes, history of science.
Frequently Asked Questions
How many Réaumur are in 1 Celsius?
There are exactly 0.8 Réaumur in 1 Celsius. This means the conversion factor from Celsius to Réaumur is 0.8.
What is the formula to convert Celsius to Réaumur?
The formula to convert Celsius to Réaumur is: °Ré = °C × 4/5. For example, to convert 10 Celsius to Réaumur, you would multiply 10 by 0.8.
What is a Celsius?
The Celsius scale sets 0°C as the freezing point and 100°C as the boiling point of water at standard pressure. It is used by most countries worldwide.
What is a Réaumur?
The Réaumur scale sets water's freezing point at 0 °Ré and its boiling point at 80 °Ré. It survives in a few European cheese and syrup recipes.
What are the common uses of Celsius?
The Celsius is commonly used in weather, cooking, science.
Related Temperature Conversions
Cite this page
UnitConvertLab. (2026). Celsius to Réaumur converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/celsius-to-reaumur