Rankine to Kelvin Converter
Temperature · unit-converter
Convert Rankine to Kelvin with offset-aware formulas (not simple ratio scaling), step-by-step lines, and reference tables. Uses 273.15 for Celsius–Kelvin offsets, R = (9/5) × K for kelvin–rankine, and °F–R offset 459.67.
About Rankine
Rankine is an absolute scale with the same degree size as Fahrenheit (1 R interval = 1 °F interval). 0 R is absolute zero. Relationship: R = °F + 459.67, and R = (9/5) × K (exact ratio to kelvin).
About Kelvin
Kelvin is the SI base unit for thermodynamic temperature. 0 K is absolute zero. The triple point of water is 273.16 K by definition; this tool uses 273.15 for °C ↔ K in everyday conversions.
How to convert Rankine to Kelvin
From Rankine to Kelvin: K = R × (5/9), the inverse of the kelvin-to-rankine rule.
491.67 R corresponds to 273.15 K (ice point on both absolute scales).
Unlike units with a single fixed ratio (meters to feet), absolute temperatures include an offset. Always use the full formula for this pair—do not “multiply only” by a scale factor unless you are computing a temperature difference (interval), where offsets cancel.
Examples
Example #1: Convert 491.67 r to Kelvin
0.000000°C + 273.15 = 273.150000K
→ 273.15 k
Example #2: Convert 671.67 r to Kelvin
100.000000°C + 273.15 = 373.150000K
→ 373.15 k
Summary
From Rankine to Kelvin: K = R × (5/9), the inverse of the kelvin-to-rankine rule.
Relationship context
Converting Rankine to Kelvin uses different zeros and step sizes. You cannot multiply by a single ratio alone for every pair—you first express the same physical temperature in an intermediate form (Celsius is used inside this tool), then map to Kelvin. Unlike length or energy units, offsets matter for Celsius and Fahrenheit; kelvin and rankine are absolute scales linked by the exact factor 9/5.
Conversion tables
| Rankine (r) | Kelvin (k) |
|---|---|
| 0 | 0 |
| 400 | 222.222222222 |
| 491.67 | 273.15 |
| Rankine (r) | Kelvin (k) |
|---|---|
| 536.67 | 298.15 |
| 671.67 | 373.15 |
| 1,000 | 555.555555556 |