MeasureCalc

Convert Rankine (°R) to Kelvin (K)

Category: Temperature

0.555556 kelvin

1 rankine = 0.555556 kelvin

High-precision rounding: 6 decimals

How to convert rankine (°r) to kelvin (k)

Temperature scales combine ratios and offsets. Kelvin is absolute (no negative values), Celsius offsets Kelvin by 273.15, and Fahrenheit uses a different step and zero point. Because offsets exist, temperature conversions require both a factor and an addition/subtraction.

This converter calculates Rankine (°R) to Kelvin (K) values by using the correct conversion rule for the Temperature category. For linear units, standardized factors are used. For temperature, the calculator applies the proper formula with offsets.

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Quick conversion table

Handy values for Rankine (°R) to Kelvin (K). Click a value to open that exact result.

Rankine (°R) Kelvin (K)
1 0.555556
0.5 0.277778
2.5 1.388889
10 5.555556

Conversion formula

Use the following formula:

K = °R × 5/9

Temperature conversions use exact affine formulas (ratio + offset).

Common mistakes

  • Using only a ratio (×1.8 or ×0.555…) without adding/subtracting the offset (±32, +273.15).
  • Rounding too early; convert first, then round to the desired precision.

Unit facts

  • Rankine (°R): Rankine (°R) is an absolute scale using Fahrenheit-sized degrees; used in some engineering contexts.
  • Kelvin (K): Kelvin (K) is the absolute thermodynamic scale; SI base unit for temperature.

About Rankine (°R)

Rankine (°R)

Absolute scale using Fahrenheit-sized degrees. Useful in aerospace and thermodynamic calculations within imperial frameworks.

History: Introduced by William Rankine in the 19th century as an analogue of Kelvin for Fahrenheit users.

About Kelvin (K)

Kelvin (K)

Absolute SI scale starting at 0 K with no negative values. Used for thermodynamics, cryogenics, and color temperature (K).

History: Defined via the Boltzmann constant since 2019, linking temperature directly to energy at the particle level.

Frequently asked questions

How do I convert Rankine (°R) to Kelvin (K)?
Enter the temperature in Rankine (°R) and the calculator will apply the exact conversion formula to return the result in Kelvin (K).
Is Rankine (°R) to Kelvin (K) conversion exact?
Yes. Temperature conversions use exact affine formulas with a ratio and an offset.
Why does temperature conversion depend on the input value?
Unlike linear unit conversions, temperature scales do not start at the same zero point, so the conversion includes an offset.

Convert Rankine (°R) to other units

Convert other units to Kelvin (K)