Convert Rankine to Kelvin
Live bidirectional calculator for Rankine (°R) and Kelvin (K) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Both Rankine and Kelvin share absolute zero (0 °R = 0 K). Simply scale the degree size by multiplying by 5/9.
Rankine to Kelvin Conversion Table
Precomputed values for quick reference and printing.
| Rankine | Kelvin |
|---|---|
| 1 °R | 0.5556 K |
| 2 °R | 1.1111 K |
| 3 °R | 1.6667 K |
| 4 °R | 2.2222 K |
| 5 °R | 2.7778 K |
| 6 °R | 3.3333 K |
| 7 °R | 3.8889 K |
| 8 °R | 4.4444 K |
| 9 °R | 5 K |
| 10 °R | 5.5556 K |
| 15 °R | 8.3333 K |
| 20 °R | 11.1111 K |
| 25 °R | 13.8889 K |
| 30 °R | 16.6667 K |
| 40 °R | 22.2222 K |
| 50 °R | 27.7778 K |
| 75 °R | 41.6667 K |
| 100 °R | 55.5556 K |
| Kelvin | Rankine |
|---|---|
| 1 K | 1.8 °R |
| 2 K | 3.6 °R |
| 3 K | 5.4 °R |
| 4 K | 7.2 °R |
| 5 K | 9 °R |
| 6 K | 10.8 °R |
| 7 K | 12.6 °R |
| 8 K | 14.4 °R |
| 9 K | 16.2 °R |
| 10 K | 18 °R |
| 15 K | 27 °R |
| 20 K | 36 °R |
| 25 K | 45 °R |
| 30 K | 54 °R |
| 40 K | 72 °R |
| 50 K | 90 °R |
| 75 K | 135 °R |
| 100 K | 180 °R |
About Rankine (°R)
The Rankine scale is an absolute temperature scale using Fahrenheit-sized degrees. 0 °R is absolute zero, and 491.67 °R is the freezing point of water.
History: Proposed by William John Macquorn Rankine in 1859. Used primarily in US engineering thermodynamics.
Common Uses: Thermodynamic calculations in US engineering, particularly in HVAC, combustion, and turbine analysis.
About Kelvin (K)
The kelvin is the SI base unit of thermodynamic temperature. It is defined by setting the Boltzmann constant to exactly 1.380649 × 10⁻²³ J/K. 0 K is absolute zero.
History: Named after Lord Kelvin (William Thomson), who proposed the absolute temperature scale in 1848. Adopted as an SI base unit in 1954.
Common Uses: Physics, chemistry, engineering, color temperature in photography and lighting, and cryogenics.
❓ Frequently Asked Questions
What is 1 °R in K?
1 Rankine (°R) is equal to 0.5556 Kelvin (K). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Rankine to Kelvin?
The formula is: K = °R × 5/9. Both Rankine and Kelvin share absolute zero (0 °R = 0 K). Simply scale the degree size by multiplying by 5/9.
How do I convert 1 °R to K manually?
To convert 1 °R to K: apply the formula K = °R × 5/9. Substituting gives: 1 × 5/9 = 0.5556 K.