Convert Kelvin to Rankine
Rankine = Kelvin × 1.8. Type any temperature below to convert kelvin to rankine both ways — it runs entirely in your browser.
Kelvin to Rankine formula
Temperature scales have different zero points, so the conversion is a multiply-and-add, not a single ratio:
Rankine = Kelvin × 1.8
To go the other way, Kelvin = Rankine × 0.5555556.
Worked example
Convert 300 K to rankine:
= 300 × 1.8 = 540 °R.
Common temperatures in Kelvin and Rankine
| Reference point | Kelvin (K) | Rankine (°R) |
|---|---|---|
| Absolute zero | 0 | 0 |
| Freezing point of water | 273.15 | 491.67 |
| Refrigerator | 277.15 | 498.87 |
| Room temperature | 294.15 | 529.47 |
| Normal human body temperature | 310.15 | 558.27 |
| A hot summer day | 318.15 | 572.67 |
| Boiling point of water (sea level) | 373.15 | 671.67 |
About the Kelvin and Rankine scales
Kelvin: The kelvin is the SI base unit of temperature. It starts at absolute zero (0 K = −273.15 °C) and uses the same degree size as Celsius, so it is written without a degree sign.
Rankine: The Rankine scale starts at absolute zero like Kelvin but uses the Fahrenheit-sized degree (0 °R = −459.67 °F). It appears in some US engineering and thermodynamics work.
Frequently asked questions
- What is 300 K in Rankine?
- 300 K = 540 °R.
- How do I convert Kelvin to Rankine?
- Use rankine = kelvin × 1.8. For example, 300 K → 540 °R.
- How do I convert Rankine back to Kelvin?
- Reverse it: kelvin = rankine × 0.5555556.
- Is converting Kelvin to Rankine just multiplication?
- Yes — Kelvin and Rankine share the same zero (absolute zero), so rankine = kelvin × 1.8 with no constant added.