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Kelvin to Rankine Converter

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

K

Rankine

491.4

°R

273 K = 491.4 °R

°R = K × 9/5

Kelvin to Rankine: 1 K equals 1.8 °R. To convert kelvin to rankine, multiply by 1.8 (°R = K × 9/5). For example, 10 K = 18 °R.

How to Convert Kelvin to Rankine

To convert from kelvin to rankine, multiply the value by 1.8. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

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

Kelvin to Rankine Conversion Chart

Kelvin (K)Rankine (°R)
0.10.18
0.250.45
0.50.9
11.8
23.6
35.4
59
1018
2036
2545
5090
100180
250450
10001800

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 Kelvin (K) Rankine (°R)
Absolute zero00
Water freezing point273.15491.67
Surface of the Sun577810400.4

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FAQ

How do you convert Kelvin to Rankine?

Multiply the Kelvin value by 9/5 (or 1.8). For example, 293.15 K × 9/5 = 527.67 °R.

Why multiply by 9/5?

A Rankine degree is 5/9 the size of a Kelvin degree (same as Fahrenheit vs Celsius). To convert from the larger unit (Kelvin) to the smaller unit (Rankine), multiply by 9/5.

Is 0 K the same as 0 °R?

Yes. Both Kelvin and Rankine are absolute scales, so their zero points are the same: absolute zero, the theoretical minimum temperature.

What is the boiling point of water in both scales?

Water boils at 373.15 K and 671.67 °R at standard atmospheric pressure.

What is the triple point of water in Rankine?

The triple point of water (273.16 K) equals 491.688 °R.

How many rankine are in 1 kelvin?

1 K equals 1.8 °R.

How many rankine are in 5 kelvin?

5 K = 9 °R.

How do you convert rankine back to kelvin?

Use the inverse formula: K = °R × 5/9. For example, 1 °R = 0.555556 K.