Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Rankine to Kelvin
Convert °R to K instantly, then review the formula, assumptions, and rounding guidance.
TemperatureInstant result
Decimals
Formula Convert °R to kelvin, then convert to K. 1 °R = 0.5556 K
Common examples
One value, several units
Celsius-272.5944 °C
Fahrenheit-458.67 °F
Kelvin0.5556 K
Conversion table
| °R | K |
|---|---|
| 1 °R | 0.5556 K |
| 2 °R | 1.1111 K |
| 5 °R | 2.7778 K |
| 10 °R | 5.5556 K |
| 25 °R | 13.8889 K |
| 50 °R | 27.7778 K |
| 100 °R | 55.5556 K |
Conversion chart
1 °R0.5556 K
5 °R2.7778 K
10 °R5.5556 K
25 °R13.8889 K
50 °R27.7778 K
Worked example
0 °C equals 32 °F.
Unit definition
Rankine (°R) This unit is defined through the displayed non-linear relationship to kelvin.
Unit history
Rankine is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert °R to kelvin.
3. Convert the base value to K and apply your display precision.
Understand the result before using it
Rankine to Kelvin converts a value measured in Rankine (°R) into the equivalent value in Kelvin (K). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
Convert °R to kelvin, then convert the base value to K.
Assumptions
- Rankine and Kelvin represent the same temperature quantity.
- The input is expressed in °R; the output is expressed in K.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 °R = 0.555555555556 K. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a °R measurement in a document that expects K.
- Compare a rankine value with a value reported in kelvin.
- Check the °R-to-K arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Temperature scales use offsets as well as scale factors, so a simple multiply-or-divide shortcut is not generally valid.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Rankine to Kelvin?
Convert °R to kelvin, then convert the base value to K. Using the displayed relationship, 1 °R equals 0.555555555556 K.
How many Kelvin are in one Rankine?
One Rankine is 0.555555555556 Kelvin. The displayed digits may be rounded.
Can I reverse the °R to K conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts K back to °R.
Is the Rankine to Kelvin result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.