Degrees Réaumur (°Ré)
The Réaumur scale sets the freezing point of water at 0 and the boiling point at 80 degrees, so one degree Réaumur is 1.25 °C.
Convert degrees Réaumur to any temperature unit
1 degree Réaumur = 1.25 degrees Celsius
Quick facts
- Unit
- Degree Réaumur (plural: degrees Réaumur)
- Symbol
- °Ré
- Measures
- Temperature
- System
- Historical scales
- Definition
- °Ré = °C × 4/5; water freezes at 0 °Ré and boils at 80 °Ré.
- Also written
- reaumur, °Re, °r
1 degree Réaumur in other units
| Degrees Celsius | 1.25 °C |
| Degrees Fahrenheit | 34.25 °F |
| Kelvins | 274.4 K |
| Gas marks | -1.6575 GM |
| Degrees Rankine | 493.92 °R |
What is a degree Réaumur?
The Réaumur scale sets the freezing point of water at 0 and the boiling point at 80 degrees, so one degree Réaumur is 1.25 °C. It was widely used in Europe, especially France, Germany and Russia, until the 20th century, and appears in 19th-century novels. It survives in some Italian and Swiss cheese-making, where milk temperatures are still quoted in °Ré.
History of the degree Réaumur
René Antoine Ferchault de Réaumur introduced the scale in 1730, based on the expansion of alcohol, which he found expanded by 80 thousandths between freezing and boiling water.
Top degree Réaumur conversions
Common amounts of degrees Réaumur
Convert degrees Réaumur to all 16 other units
Common scales
Historical scales
Scientific
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Frequently asked questions
What is a degree Réaumur?
The Réaumur scale sets the freezing point of water at 0 and the boiling point at 80 degrees, so one degree Réaumur is 1.25 °C.
How is the degree Réaumur defined?
°Ré = °C × 4/5; water freezes at 0 °Ré and boils at 80 °Ré.
How many degrees Celsius are in a degree Réaumur?
One degree Réaumur equals 1.25 degrees Celsius.
How many degrees Fahrenheit are in a degree Réaumur?
One degree Réaumur equals 34.25 degrees Fahrenheit.
How many kelvins are in a degree Réaumur?
One degree Réaumur equals 274.4 kelvins.