Enter the temperature in Réaumur in the top field, then press the 'Convert' button. Alternatively, you can convert from Rankine to Réaumur by entering the value in Rankine in the bottom field and press 'Convert'.

The Réaumur scale, named after René Antoine Ferchault de Réaumur places water freezing point at 0 °Ré and water boiling point at 80 °Ré.
The Rankine scale is named after Scottish physicist William John Macquorn Rankine. Similarly to kelvin absolute zero is 0 °R, equivalent to -459.67 °F. Rankine uses the same interval as Fahrenheit.