How to convert degrees Réaumur to degrees Celsius
°C = °Ré × 5/4Temperature scales have different zero points, so the conversion needs an offset as well as a scale factor. In one step: °C = °Ré × 1.25 + 5.684341886×10⁻¹⁴.
Worked examples
- 0 degrees Réaumur0 × 5/4 = 0 °C
- 20 degrees Réaumur20 × 5/4 = 25 °C
- 40 degrees Réaumur40 × 5/4 = 50 °C
- 60 degrees Réaumur60 × 5/4 = 75 °C
- 80 degrees Réaumur80 × 5/4 = 100 °C
Degrees Réaumur to degrees Celsius conversion table
Values are calculated by the conversion engine using the full formula and rounded to 8 significant figures.
| Degrees Réaumur (°Ré) | Degrees Celsius (°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 |
| Degrees Réaumur (°Ré) | Degrees Celsius (°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 |
About the units
Degree Réaumur (°Ré)
A historical scale with water freezing at 0 °Ré and boiling at 80 °Ré.
Degree Celsius (°C)
Defined as the kelvin temperature minus 273.15. Water freezes at 0 °C and boils at about 100 °C at sea level; normal body temperature is about 37 °C.
Frequently asked questions
What is the formula to convert degrees Réaumur to degrees Celsius?
°C = °Ré × 5/4. Temperature scales have different zero points, so the conversion needs an offset as well as a scale factor. In one step: °C = °Ré × 1.25 + 5.684341886×10⁻¹⁴.
What is 20 degrees Réaumur in degrees Celsius?
20 °Ré = 25 °C.
What is 0 °Ré in °C?
0 °Ré = 0 °C.
Can I just multiply to convert degrees Réaumur to degrees Celsius?
Yes. Both scales start at absolute zero, so the conversion is a pure multiplication by 1.25.
Is this °Ré to °C converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.