Temperature Tool

Rankine to Kelvin Converter

K equals R times five-ninths.
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Rankine (°R) → Kelvin (K)

298.15 K

Also: 25 °C Celsius · 77 °F Fahrenheit

Show Your Work

  1. 1. K = 536.67 × 5/9
  2. 2. K = 298.15 K
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About this conversion

Rankine to Kelvin scales Rankine-sized degrees down to Kelvin (Celsius-sized) degrees: K = R × 5/9. Both scales start at absolute zero, so no offset is required.

Rankine to Kelvin Reference Table

Rankine (°R)Kelvin (K)
00
10055.555556
200111.11111
300166.66667
400222.22222
491.67273.15
500277.77778
536.67298.15
600333.33333
671.67373.15
700388.88889
800444.44444
900500
1000555.55556
1200666.66667
1500833.33333
20001111.1111
25001388.8889
30001666.6667

When to use Rankine → Kelvin

  • Translating a U.S. thermodynamic engineering value into Kelvin for a metric scientific reference
  • Cross-checking absolute-temperature values between Rankine and Kelvin tables
  • Educational contexts comparing the four-scale system

Worked Example

An engineering reference is 536.67°R. What is that in Kelvin?

  1. Start with the Rankine value: R = 536.67.
  2. Multiply by 5/9: 536.67 × 5/9 = 298.15.
  3. So 536.67°R = 298.15 K.

Frequently Asked Questions

What is the formula to convert Rankine to Kelvin?

K = R × 5/9. Multiply by 5/9 to scale Rankine-sized degrees down to Kelvin-sized degrees; no offset because both share absolute zero.

What is 491.67°R in Kelvin?

491.67°R = 273.15 K. The freezing point of water.

What is 0°R in Kelvin?

0°R = 0 K. Both scales originate at absolute zero.

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