Convert Reaumur (°r) to Fahrenheit (°F) instantly.
About these units
Reaumur (°r)
The Réaumur scale, created by René Antoine Ferchault de Réaumur in 1730, was once a major temperature scale in Europe, particularly in France, Germany, Russia, and parts of Italy. It sets the freezing point of water at 0°r and the boiling point at 80°r, giving it eighty divisions between these points. Réaumur's scale was historically used in cheese-making, brewing, confectionery, textile production, and early scientific experiments. Many recipes and industrial methods from the 18th and 19th centuries reference it. The scale's smaller numeric range made it easy to work with, though it offered less granularity than Celsius. Eventually, the Celsius scale replaced Réaumur almost everywhere due to metric standardization. However, the Réaumur scale's legacy persists in historical documents, culinary traditions, and scientific literature from the Enlightenment era, where it formed a cornerstone of early temperature standardization.
Fahrenheit (°F)
The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in the early 18th century and remains widely used in the United States and a few Caribbean nations. Its defining points—32°F for water's freezing point and 212°F for boiling—reflect an early attempt to create a scale that avoided negative values for common weather and indoor temperatures. Fahrenheit offers finer resolution per degree compared to Celsius. Because one Fahrenheit degree is smaller than one Celsius degree (1°C = 1.8°F), meteorologists argue that Fahrenheit provides a more nuanced sense of temperature changes in everyday life. For example, small variations in outdoor temperature feel more perceptible when expressed in Fahrenheit than in Celsius. Despite being non-metric, the Fahrenheit scale remains deeply rooted in American cultural, historical, and industrial practices. Its persistence illustrates how measurement systems often become embedded in a society's identity, even when alternative units may be more scientifically elegant.