Celsius to Réaumur Converter
Quick answer
To convert degrees Celsius to Réaumurs, multiply by 0.8 (or divide by 1.25). Therefore, 1 Celsius (°C) equals 0.8 Réaumurs (°Ré).
Formula: °Ré = °C × 0.8. Worked example: 10 °C = 8 °Ré.
Convert Celsius (°C) to Réaumur (°Ré) online with our free unit converter. In temperature, 1 °C = 0.8 °Ré. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Celsius to Réaumur
- Step 1 — start with the formula. °Ré = °C × 4/5
- Step 2 — substitute your figure. 10 °C × 0.8
- Step 3 — read the result. 10 °C = 8 °Ré
- Step 4 — check it in reverse. °C = °Ré × 5/4 returns 10 °C, which matches the figure you started with.
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
Celsius and Réaumur Relationship
This calculation facilitates standardized conversion between recognized units of temperature. Since 1 Celsius represents a fraction of a Réaumur (1 Réaumur ≈ 1.25 degrees Celsius), the Réaumur is the larger measurement interval. Understanding the relationship between Celsius and Réaumur is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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 of Celsius: 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 of Réaumur: historic recipes, history of science.
Frequently Asked Questions
- How many Réaumurs are in 1 Celsius?
- There are exactly 0.8 Réaumurs 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 degrees Celsius to Réaumurs, 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