Rankine to Kelvin (°R → K)
Formula
°R → kelvin → KConversion Table
| °R | K |
|---|---|
| 0 | 0 |
| 1.0000 | 0.55556 |
| 2.0000 | 1.1111 |
| 3.0000 | 1.6667 |
| 4.0000 | 2.2222 |
| 5.0000 | 2.7778 |
| 6.0000 | 3.3333 |
| 7.0000 | 3.8889 |
| 8.0000 | 4.4444 |
| 9.0000 | 5.0000 |
| 10.000 | 5.5556 |
| 11.000 | 6.1111 |
| 12.000 | 6.6667 |
| 13.000 | 7.2222 |
| 14.000 | 7.7778 |
| 15.000 | 8.3333 |
| 16.000 | 8.8889 |
| 17.000 | 9.4444 |
| 18.000 | 10.000 |
| 19.000 | 10.556 |
| °R | K |
|---|---|
| 20.000 | 11.111 |
| 21.000 | 11.667 |
| 22.000 | 12.222 |
| 23.000 | 12.778 |
| 24.000 | 13.333 |
| 25.000 | 13.889 |
| 26.000 | 14.444 |
| 27.000 | 15.000 |
| 28.000 | 15.556 |
| 29.000 | 16.111 |
| 30.000 | 16.667 |
| 31.000 | 17.222 |
| 32.000 | 17.778 |
| 33.000 | 18.333 |
| 34.000 | 18.889 |
| 35.000 | 19.444 |
| 36.000 | 20.000 |
| 37.000 | 20.556 |
| 38.000 | 21.111 |
| 39.000 | 21.667 |
| °R | K |
|---|---|
| 40.000 | 22.222 |
| 41.000 | 22.778 |
| 42.000 | 23.333 |
| 43.000 | 23.889 |
| 44.000 | 24.444 |
| 45.000 | 25.000 |
| 46.000 | 25.556 |
| 47.000 | 26.111 |
| 48.000 | 26.667 |
| 49.000 | 27.222 |
| 50.000 | 27.778 |
| 51.000 | 28.333 |
| 52.000 | 28.889 |
| 53.000 | 29.444 |
| 54.000 | 30.000 |
| 55.000 | 30.556 |
| 56.000 | 31.111 |
| 57.000 | 31.667 |
| 58.000 | 32.222 |
| 59.000 | 32.778 |
| °R | K |
|---|---|
| 60.000 | 33.333 |
| 61.000 | 33.889 |
| 62.000 | 34.444 |
| 63.000 | 35.000 |
| 64.000 | 35.556 |
| 65.000 | 36.111 |
| 66.000 | 36.667 |
| 67.000 | 37.222 |
| 68.000 | 37.778 |
| 69.000 | 38.333 |
| 70.000 | 38.889 |
| 71.000 | 39.444 |
| 72.000 | 40.000 |
| 73.000 | 40.556 |
| 74.000 | 41.111 |
| 75.000 | 41.667 |
| 76.000 | 42.222 |
| 77.000 | 42.778 |
| 78.000 | 43.333 |
| 79.000 | 43.889 |
Rankine to Kelvin Conversion
Converting Rankine (°R) to Kelvin (K) is a common temperature conversion. 1 °R equals 0.555556 K. For example, 100 °R is equal to 55.555556 K.
Quick Mental Math: Rankine to Kelvin
Divide by 1.80 to convert rankine to kelvin.
Why is converting Rankine to Kelvin tricky?
Kelvin has a different zero point (273.15), so you can't just multiply or divide.
Reference Temperatures
Absolute zero: 0 °R = 0 K. Water freezing point: 491.67 °R = 273.15 K. Room temperature: 527.67 °R = 293.15 K. Body temperature: 558.27 °R = 310.15 K. Water boiling point: 671.67 °R = 373.15 K.
What is Rankine?
Rankine (°R) is a unit of temperature. The Rankine scale is an absolute temperature scale used in engineering, defined as degrees Fahrenheit offset from absolute zero. One degree Rankine equals exactly 5/9 kelvin, with 0 °R at absolute zero (-459.67 °F). It is used primarily in thermodynamics and aerospace engineering in the United States [nist-sp-811]. The Rankine scale was proposed by William John Macquorn Rankine in 1859 to align the Fahrenheit scale with absolute zero. It was adopted to facilitate thermodynamic calculations using Fahrenheit-based units, especially in steam engine and aerospace contexts [nist-sp-811]. Rankine is mainly used in the US aerospace and engineering industries where Fahrenheit is standard. It is recognized by the NIST and used alongside Kelvin for absolute temperature measurements. The scale is uncommon outside specialized fields and the US [nist-sp-811].
What is Kelvin?
Kelvin (K) is a unit of temperature. Kelvin is the SI base unit of thermodynamic temperature defined by fixing the numerical value of the Boltzmann constant to 1.380649×10⁻²³ J·K⁻¹. It uses absolute zero as its null point and increments equal to those of the Celsius scale. One kelvin equals one degree Celsius in magnitude but starts at absolute zero, representing the lowest physically possible temperature [bipm-si-brochure]. The kelvin scale was named after William Thomson, 1st Baron Kelvin, who proposed an absolute thermodynamic temperature scale in 1848. It was formally adopted as an SI base unit in 1967–1968 by the CGPM to provide a universal temperature standard based on fundamental constants [cgpm-resolutions]. Kelvin is the standard temperature unit in scientific research, thermodynamics, and engineering worldwide. It is the official unit for temperature in physics and chemistry according to the International System of Units (SI), used globally including by NIST and BIPM member countries [nist-si-guide].
Common Misspellings
People often search for this conversion using these alternate spellings: rankin, rankinee, rankinne, rankin temperature, kelvin degree, kelvins, kelvins unit, kelvian, kelvins scale. All of these refer to the Rankine to Kelvin conversion.