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

Kelvin is the unit of measure for temperature adopted by the International System of Units. Absolute zero is 0 K, equivalent to -273.15 °C. Kelvin uses the same interval as Celsius. The Kelvin scale is named after Baron Kelvin of Largs, who described the need for an absolute thermometric scale in his paper "On an Absolute Thermometric Scale".
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.
On an Absolute Thermometric Scale - Lord Kelvin's 1882 paper.