🌡️ Réaumur to Fahrenheit Converter
Convert temperatures from Réaumur (°Ré) to Fahrenheit (°F). The Réaumur scale was proposed by René Antoine Ferchault de Réaumur in 1730, setting the freezing point of water at 0 degrees and the boiling point at 80 degrees. It was widely used in Europe, particularly in France, Germany, and Russia.
What Is the Réaumur Scale?
The Réaumur scale was proposed by the French physicist and naturalist René Antoine Ferchault de Réaumur in 1730. It is a temperature scale that sets the freezing point of water at 0 degrees and the boiling point of water at 80 degrees.
Key characteristics of the Réaumur scale:
- Zero point: 0 °Ré = the freezing point of water (0 °C, 32 °F).
- Boiling point: 80 °Ré = the boiling point of water (100 °C, 212 °F).
- Unit size: 1 degree Réaumur = 1.25 degrees Celsius (or 2.25 degrees Fahrenheit).
- Conversion to Fahrenheit: °F = (°Ré × 9/4) + 32.
The Réaumur scale was widely used in Europe during the 18th and 19th centuries, particularly in France, Germany, and Russia. It is still used in some specialized contexts today, such as the production of wine, cheese, and certain industrial processes.
How to Convert Réaumur to Fahrenheit
The formula to convert Réaumur to Fahrenheit is:
°F = (°Ré × 9/4) + 32
or °F = °Ré × 2.25 + 32
This formula works because:
- Multiplying by 9/4 (or 2.25) converts the Réaumur increment to Fahrenheit degrees.
- Adding 32 shifts the zero point from the freezing point of water to the Fahrenheit scale.
For example, to convert 80 °Ré (the boiling point of water) to Fahrenheit:
°F = (80 × 9/4) + 32
°F = 80 × 2.25 + 32
°F = 180 + 32
°F = 212 °F
Why Use This Converter?
- Instant results: Get accurate temperature conversions in real-time.
- Step-by-step breakdown: See exactly how the conversion is calculated.
- Common reference table: Quickly check temperatures from -40 °Ré to 100 °Ré.
- Free & private: No registration, no data storage — all calculations are done in your browser.
❓ Réaumur to Fahrenheit FAQ
What is the formula to convert Réaumur to Fahrenheit?
The formula is °F = (°Ré × 9/4) + 32. You can also use °F = °Ré × 2.25 + 32.
What is the Réaumur scale used for?
The Réaumur scale was widely used in Europe during the 18th and 19th centuries, particularly in France, Germany, and Russia. Today, it is still used in some specialized contexts, such as the production of wine, cheese, and certain industrial processes.
What is the relationship between Réaumur and Celsius?
Both scales have the same zero point (the freezing point of water = 0 °Ré = 0 °C). However, the boiling point of water is 80 °Ré on the Réaumur scale and 100 °C on the Celsius scale. One degree Réaumur is equal to 1.25 degrees Celsius.
What is absolute zero in Réaumur?
Absolute zero (−459.67 °F, 0 K, −273.15 °C) is approximately −218.52 °Ré.
What is the freezing point of water in Réaumur?
The freezing point of water (32 °F, 0 °C, 273.15 K) is 0 °Ré.
What is the boiling point of water in Réaumur?
The boiling point of water (212 °F, 100 °C, 373.15 K) is 80 °Ré.
Who invented the Réaumur scale?
The Réaumur scale was invented by René Antoine Ferchault de Réaumur (1683–1757), a French physicist and naturalist, in 1730.
Is the Réaumur scale still used today?
The Réaumur scale is largely obsolete for everyday use but is still referenced in some specialized contexts, particularly in European wine and cheese production.
How accurate is this converter?
This converter provides highly accurate results using the standard conversion formula °F = (°Ré × 9/4) + 32. You can adjust the decimal precision to suit your needs.
Is this converter free?
Yes, this converter is completely free to use. No registration or personal data storage is required.