Kelvin to Rankine Converter
Two-way converter: change Kelvin to Rankine or Rankine to Kelvin in one step.
Type a value in either field for an instant conversion
About converting Kelvin and Rankine
Kelvin is the SI absolute temperature unit; Rankine is its imperial counterpart, used in some US engineering disciplines like aerospace and thermodynamics. Both scales start at absolute zero — only the step size differs, so the conversion is a simple multiplication.
To convert Kelvin to Rankine, use the formula: °R = K × 9/5. The reverse formula handles the other direction automatically — type into either field.
Every calculation runs locally in your browser and updates instantly — nothing is uploaded, and the result appears the moment you type.
Why use this converter
Works both ways
Convert K to °R or °R to K by typing in either field.
Exact formula
Uses the standard temperature conversion formula with no shortcuts.
No install
Runs in any browser on phone or desktop, with no sign-up required.
Frequently asked questions
How do I convert Kelvin to Rankine?
Multiply the Kelvin value by 1.8 (or 9/5). For example, 300 K = 300 × 1.8 = 540 °R.
Why is the factor 1.8?
1 K equals 9/5 (1.8) °R because the Rankine degree is the same size as the Fahrenheit degree, which is 9/5 of a Kelvin step.
Where is Rankine used?
In US aerospace engineering, thermodynamic textbooks, and some HVAC calculations that pair absolute temperature with imperial units.
Can Rankine be negative?
No. Rankine, like Kelvin, starts at absolute zero (0 °R = 0 K), so values cannot go below zero.
What is 0 K in Rankine?
0 K equals 0 °R — both scales share the same absolute-zero origin.