Convert Kelvin to Rankine
Live bidirectional calculator for Kelvin (K) and Rankine (°R) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Both Kelvin and Rankine share absolute zero (0 K = 0 °R). Simply scale the degree size by multiplying by 9/5 (1.8).
Kelvin to Rankine Conversion Table
Precomputed values for quick reference and printing.
| 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 |
| 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 |
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.
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.
❓ Frequently Asked Questions
What is 1 K in °R?
1 Kelvin (K) is equal to 1.8 Rankine (°R). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Kelvin to Rankine?
The formula is: °R = K × 9/5. Both Kelvin and Rankine share absolute zero (0 K = 0 °R). Simply scale the degree size by multiplying by 9/5 (1.8).
How do I convert 1 K to °R manually?
To convert 1 K to °R: apply the formula °R = K × 9/5. Substituting gives: 1 × 9/5 = 1.8 °R.