# Rankine to Kelvins Converter

Enter the temperature in Rankine below to get the value converted to kelvins.

Results in Kelvins: 1 °R = 0.555556 K

Do you want to convert kelvins to Rankine?

## How to Convert Rankine to Kelvins

Convert degrees Rankine to kelvins with this simple formula:

kelvins = [°R] × 5 / 9

Insert the [°R] temperature measurement in the formula and then solve to find the result.

For example, let's convert 50 °R to kelvins:

50 °R = ( 50 × 5 / 9 ) = 27.777778 K

## What is Rankine?

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

### Important Temperatures In Degrees Rankine

TemperatureDegrees Rankine
Absolute Zero0 °R
Freezing Point of Water491.67 °R
Triple Point of Water491.688 °R
Boiling Point of Water671.67 °R

## What is a Kelvin?

The Kelvin scale is an absolute temperature scale that uses absolute zero as the starting point. The kelvin is defined in terms of the Boltzmann constant, which is a measure of the energy of motion corresponding to one kelvin.

More specifically, one kelvin is equal to the change of thermodynamic temperature that results in a change of thermal energy kT by 1.380649 × 10−23 J.

0 kelvins are equal to −273.15 degrees Celsius, which is the point of absolute zero.

The kelvin is the SI base unit for temperature in the metric system. Kelvins can be abbreviated as K; for example, 1 kelvin can be written as 1 K.

The kelvin scale is different from other temperature scales in that it is not expressed in degrees, values are expressed in kelvins. When using the Kelvin scale in writing, the "k" is capitalized, however when using the kelvin as a unit the "k" should be lower-case, even though it is named for a person.

### Important Temperatures In Kelvins

TemperatureKelvins
Absolute Zero0 K
Freezing Point of Water273.15 K
Triple Point of Water273.16 K
Boiling Point of Water373.15 K

## Rankine to Kelvin Conversion Table

Rankine measurements converted to kelvins
Rankine Kelvins
-50 °R -27.78 K
-40 °R -22.22 K
-30 °R -16.67 K
-20 °R -11.11 K
-10 °R -5.5556 K
0 °R 0 K
10 °R 5.5556 K
20 °R 11.11 K
30 °R 16.67 K
40 °R 22.22 K
50 °R 27.78 K
60 °R 33.33 K
70 °R 38.89 K
80 °R 44.44 K
90 °R 50 K
100 °R 55.56 K
110 °R 61.11 K
120 °R 66.67 K
130 °R 72.22 K
140 °R 77.78 K
150 °R 83.33 K
160 °R 88.89 K
170 °R 94.44 K
180 °R 100 K
190 °R 105.56 K
200 °R 111.11 K
300 °R 166.67 K
400 °R 222.22 K
500 °R 277.78 K
600 °R 333.33 K
700 °R 388.89 K
800 °R 444.44 K
900 °R 500 K
1,000 °R 555.56 K

## References

1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf