Rankine to Kelvin Converter
Unit ConversionConvert Rankine to Kelvin using the exact formula K = R x 5/9.
Kelvin
Equivalent temperature in Kelvin
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SponsoredThis calculator converts a temperature in degrees Rankine to Kelvin using the exact formula: multiply the Rankine value by 5/9, the same as dividing by 1.8. Rankine and Kelvin are both absolute temperature scales, meaning each one has a true zero point at absolute zero rather than an arbitrary reference like the freezing point of water, so converting between them is purely a matter of resizing the degree, with no offset to add or subtract.
The reason a resizing factor is needed at all is that the two scales use differently sized degrees. A Rankine degree is the same size as a Fahrenheit degree, while a Kelvin is the same size as a Celsius degree, and a Celsius degree is larger than a Fahrenheit degree by a factor of 9/5. Because both scales share the same true zero, this calculator floors its result at 0 K for any Rankine input below 0°R, since an unclamped result would describe a temperature colder than absolute zero.
For the reverse direction, converting a Kelvin value into Rankine, or converting to Celsius or Fahrenheit instead, see the related converters below.
Rankine to Kelvin conversion table
This table spans from absolute zero up through common scientific and everyday reference points.
| Rankine | Kelvin |
|---|---|
| 0°R | 0 K |
| 491.67°R | 273.15 K |
| 527.67°R | 293.15 K |
| 558.27°R | 310.15 K |
| 671.67°R | 373.15 K |
| 1000°R | 555.56 K |
The Rankine to Kelvin formula
To convert Rankine to Kelvin, multiply the Rankine value by 5/9 (or equivalently, divide it by 1.8). For example, 491.67°R multiplied by 5/9 equals 273.15 K.
To go the other way, from Kelvin back to Rankine, multiply by 9/5 (or 1.8) instead. For example, 273.15 K multiplied by 1.8 equals 491.67°R. For the Fahrenheit or Celsius scale instead, use the Rankine to Fahrenheit or Rankine to Celsius converters below.
Why no offset is needed between Rankine and Kelvin
Unlike converting Fahrenheit to Celsius, which needs both a resizing factor and an offset because the two scales disagree on where zero sits, converting Rankine to Kelvin only needs the resizing factor. Both scales are absolute, so 0°R and 0 K describe the exact same physical temperature, absolute zero. That shared zero point is also why this pairing is the simplest formula in the whole Rankine family: a single multiplication, with nothing to add or subtract.
Frequently Asked Questions
What is the formula to convert Rankine to Kelvin?
Multiply the Rankine value by 5/9 (or divide by 1.8). For example, 671.67°R multiplied by 5/9 equals 373.15 K.
What is 0 degrees Rankine in Kelvin?
0°R equals 0 K. Both scales share the same absolute zero.
Can a Rankine value be negative?
No. Rankine is an absolute scale with a true zero point at absolute zero, so negative Rankine values are not physically meaningful. This calculator floors its result at 0 K for any Rankine input below 0°R.
Why is converting Rankine to Kelvin just a multiplication?
Both Rankine and Kelvin are absolute scales that put zero at absolute zero, so there is no offset to correct for, only a resizing factor, since a Rankine degree is smaller than a Kelvin degree by a factor of 5/9.
What is normal human body temperature in Kelvin, starting from Rankine?
Normal body temperature, 558.27°R, converts to approximately 310.15 K.
What is the boiling point of water in Kelvin, starting from Rankine?
671.67°R, the boiling point of water, converts to 373.15 K.
Is Rankine or Kelvin more commonly used in science?
Kelvin is by far the more widely used absolute scale worldwide and is the official SI base unit of temperature. Rankine is mostly limited to specific US engineering and thermodynamics contexts that already use Fahrenheit.
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