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Rankine to Kelvin Converter

Convert Rankine to Kelvin and Kelvin to Rankine instantly. Bidirectional temperature converter with formula and common values.

°R

Kelvin

273.3333

K

492 °R = 273.3333 K

K = °R × 5/9

Rankine to Kelvin: 1 °R equals 0.555556 K. To convert rankine to kelvin, multiply by 0.555556 (K = °R × 5/9). For example, 10 °R = 5.555556 K.

How to Convert Rankine to Kelvin

To convert from rankine to kelvin, multiply the value by 0.555556. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Rankine to Kelvin: K = °R × 5/9
  • Kelvin to Rankine: °R = K × 9/5

Rankine to Kelvin Conversion Chart

Rankine (°R)Kelvin (K)
0.10.055556
0.250.138889
0.50.277778
10.555556
21.111111
31.666667
52.777778
105.555556
2011.111111
2513.888889
5027.777778
10055.555556
250138.888889
1000555.555556

Understanding the Units

What is a Kelvin?

The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ J/K.

Named after William Thomson, 1st Baron Kelvin (1824–1907), who proposed an absolute thermodynamic scale in 1848.

Common contexts: physics, astronomy, cryogenics.

Real-World Reference Points

Item Rankine (°R) Kelvin (K)
Absolute zero00
Water freezing point491.67273.15
Surface of the Sun10400.45778

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FAQ

How do you convert Rankine to Kelvin?

Multiply the Rankine value by 5/9. For example, 491.67 °R × 5/9 = 273.15 K.

Are Rankine and Kelvin both absolute scales?

Yes. Both start at absolute zero (0 °R = 0 K). They differ in degree size: Rankine uses Fahrenheit-sized degrees while Kelvin uses Celsius-sized degrees.

What is the ratio between Rankine and Kelvin?

The ratio is exactly 9/5 (or 1.8). One Kelvin equals 1.8 Rankine degrees.

When would I use Rankine instead of Kelvin?

Rankine is mainly used in US engineering thermodynamics, particularly in the Rankine cycle for steam power plants. Most of the scientific world uses Kelvin.

How many kelvin are in 1 rankine?

1 °R equals 0.555556 K.

How many kelvin are in 5 rankine?

5 °R = 2.777778 K.

How do you convert kelvin back to rankine?

Use the inverse formula: °R = K × 9/5. For example, 1 K = 1.8 °R.