Temperature conversion
Kelvin to Rankine converter
Convert K to °R instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Rankine (°R)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Practical context
Understanding this conversion
Kelvin is the SI thermodynamic temperature unit. Rankine is an absolute scale using Fahrenheit-sized degrees and appears in some engineering calculations in the United States.
Because both scales share the same physical zero, this conversion differs from Celsius-to-Fahrenheit conversion: there is no added offset, only the exact scale factor 9/5.
Reviewed August 16, 2026.
Calculation
Kelvin to Rankine formula
°R = K × 9/5
Calculations retain full precision and the result is rounded only for display.
Worked example
For 25 K, the result is 45 °R. Substitute 25 K into the formula to obtain 45 °R.
Temperature scales use both scale and offset, so this conversion is not a simple multiplication.
Kelvin to Rankine reference table
Common values rounded to a maximum of 6 decimal places.
| Kelvin (K) | Rankine (°R) |
|---|---|
| 1 K | 1.8 °R |
| 5 K | 9 °R |
| 10 K | 18 °R |
| 50 K | 90 °R |
| 100 K | 180 °R |
Understanding the units
About Kelvin and Rankine
Kelvin (K)
The kelvin is the SI unit of thermodynamic temperature and begins at absolute zero.
Rankine (°R)
The Rankine scale is an absolute temperature scale that uses Fahrenheit-sized degrees.
When this conversion is useful
Kelvin to Rankine conversion is useful for weather reports, cooking instructions, laboratory readings, engineering specifications, and scientific data. It lets you compare the same temperature reading across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Celsius, Fahrenheit, Kelvin, and Rankine Explained
Learn how the four major temperature scales differ, why offsets matter, and which formulas convert between them correctly.
Read guide →FoundationsSignificant Figures and Rounding in Unit Conversions
Learn when to round conversion results, how significant figures preserve measurement meaning, and why more decimals do not guarantee more accuracy.
Read guide →Answers at a glance
Frequently asked questions
Why does Kelvin to Rankine need no offset?
Both scales begin at absolute zero. Only the degree size differs, so multiplication by 9/5 is sufficient.
What is 0 kelvin in Rankine?
Absolute zero is 0 K and also exactly 0 °R.
How does Convr round Kelvin to Rankine results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal kelvin values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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