Rankine ↔ Kelvin
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
°R = K·1,8
About this calculator
The Rankine ↔ Kelvin temperature converter calculator allows instant conversion between the Rankine and Kelvin scales. Rankine is an absolute temperature scale, like Kelvin, but with the Rankine degree equal to the Fahrenheit degree. Kelvin is the SI base unit for thermodynamic temperature. The conversion is straightforward: to convert Kelvin to Rankine, multiply by 1.8; the reverse divides by 1.8.
This tool is useful for engineers, physicists, and students working with thermodynamics, especially in systems using the Rankine scale, common in some countries for engineering applications. For example, when analyzing steam power cycles or gas turbines, temperatures are often expressed in Rankine. The calculator speeds up these calculations, avoiding manual errors.
When using the calculator, ensure the input value is in the correct unit. The conversion is linear, but errors can occur if there is confusion between the scales. Remember that Rankine is not commonly used in everyday life; its use is more technical. Also, note that the freezing point of water on the Rankine scale is 491.67 °R, while on Kelvin it is 273.15 K.
The calculator is simple and accurate, but always check the context. In engineering problems, precision in temperature values is crucial for reliable results. Use this tool as support, but understand the principles behind the conversion to avoid misinterpretations.
Frequently asked questions
What is the difference between Rankine and Kelvin?
Both are absolute temperature scales. The difference is the degree size: Kelvin uses the same increment as Celsius, while Rankine uses the same increment as Fahrenheit. Thus, 1 K equals 1.8 °R.
How to convert Kelvin to Rankine manually?
Multiply the Kelvin value by 1.8. For example, 300 K × 1.8 = 540 °R.
In what situations is the Rankine scale used?
Rankine is mainly used in engineering in the United States, in areas like thermodynamics, refrigeration systems, and power cycles, where temperatures are often expressed in degrees Fahrenheit.
Does the calculator work for negative values?
Yes, but remember that absolute zero is 0 K and 0 °R. Negative values on these scales do not physically exist. The calculator only converts numbers, but does not validate physical plausibility.
Can I use this calculator for Rankine to Fahrenheit conversions?
Not directly. This calculator converts only between Rankine and Kelvin. To convert Rankine to Fahrenheit, subtract 459.67 from the Rankine value.