Convert Rankine to Kelvin
Kelvin = Rankine × 0.5555556. Type any temperature below to convert rankine to kelvin both ways — it runs entirely in your browser.
Rankine to Kelvin formula
Temperature scales have different zero points, so the conversion is a multiply-and-add, not a single ratio:
Kelvin = Rankine × 0.5555556
To go the other way, Rankine = Kelvin × 1.8.
Worked example
Convert 540 °R to kelvin:
= 540 × 0.5555556 = 300 K.
Common temperatures in Rankine and Kelvin
| Reference point | Rankine (°R) | Kelvin (K) |
|---|---|---|
| Absolute zero | 0 | 0 |
| Freezing point of water | 491.67 | 273.15 |
| Refrigerator | 498.87 | 277.15 |
| Room temperature | 529.47 | 294.15 |
| Normal human body temperature | 558.27 | 310.15 |
| A hot summer day | 572.67 | 318.15 |
| Boiling point of water (sea level) | 671.67 | 373.15 |
About the Rankine and Kelvin scales
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.
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.
Frequently asked questions
- What is 540 °R in Kelvin?
- 540 °R = 300 K.
- How do I convert Rankine to Kelvin?
- Use kelvin = rankine × 0.5555556. For example, 540 °R → 300 K.
- How do I convert Kelvin back to Rankine?
- Reverse it: rankine = kelvin × 1.8.
- Is converting Rankine to Kelvin just multiplication?
- Yes — Rankine and Kelvin share the same zero (absolute zero), so kelvin = rankine × 0.5555556 with no constant added.