Kelvin to Rankine Converter (K to °R)

Type a value in kelvins to see it in degrees Rankine instantly.

300 K = 540 °R

Formula: °R = K × 9/5

Kelvin (K)

Rankine (°R)

300 K = 540 °R

Open in the full converter to compare with other temperature units.

How to convert kelvins to degrees Rankine

Multiply by 1.8. There is no offset, because both scales start at absolute zero.

°R = K × 9/5

Example: 300 K × 1.8 = 540 °R

Kelvin and Rankine are both absolute scales: zero on each is absolute zero. They differ only in degree size — one kelvin equals 1.8 rankine degrees — which is why the conversion is a single multiplication.

The only temperature at which a kelvin thermometer and a Rankine thermometer show the same number is absolute zero (0 K = 0 °R = −273.15 °C = −459.67 °F).

K to °R conversion table

Kelvin (K)	Rankine (°R)
0 K	0 °R
1 K	1.8 °R
10 K	18 °R
50 K	90 °R
100 K	180 °R
200 K	360 °R
255.37 K	459.666 °R
273.15 K	491.67 °R
288.15 K	518.67 °R
293.15 K	527.67 °R
300 K	540 °R
373.15 K	671.67 °R
500 K	900 °R
1,000 K	1,800 °R

About the units

Kelvin (K)

The kelvin is the SI base unit of thermodynamic temperature. It starts at absolute zero (0 K = −273.15 °C) and uses the same degree size as Celsius. It is written without a degree sign.

Degree Rankine (°R)

The Rankine scale is the absolute counterpart of Fahrenheit: it starts at absolute zero but uses Fahrenheit-sized degrees, so 0 °R = −459.67 °F. It still appears in US thermodynamics and engineering tables.

Frequently asked questions

How do I convert kelvins to degrees Rankine?

Use the formula °R = K × 9/5. Multiply by 1.8. There is no offset, because both scales start at absolute zero. For example, 300 K × 1.8 = 540 °R.

When do Kelvin and Rankine read the same?

Only at absolute zero. Because °R = 1.8 × K, the two numbers can only be equal when both are 0, which is −273.15 °C or −459.67 °F.

Is Rankine still used?

Yes, mainly in US aerospace, power-plant and refrigeration engineering, where thermodynamic tables are written in °R and BTU.

Related conversions

Background reading: Temperature Scales.