Rømer to Delisle Converter

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

Rømer to Delisle Conversion Formula


Reverse formula and conversion (Delisle to Rømer)


The Rømer scale owes its name to it's inventor Ole Christensen Rømer. A Rømer degree is equivalent to 40/21 of a Celsius degree. It places the water freezing point at 7.5 °Rø.


The Delisle scale places the water freezing point at 150 °D, and water boiling point at 0 °D. Therefore at higher Delisle numbers correspond lower temperatures. It was invented by Joseph-Nicolas Delisle, a French astronomer.