Convert Kelvin to Rankine
Instantly convert Kelvin (K) to Rankine (°R) with our free online calculator.
Formula: K to °R — K × 9/5
Reference Table
| Kelvin (K) | Rankine (°R) |
|---|---|
| 1 | 1.8 |
| 5 | 9 |
| 10 | 18 |
| 25 | 45 |
| 50 | 90 |
| 100 | 180 |
How to Convert Kelvin to Rankine
Formula
To convert Kelvin (K) to Rankine (°R): K × 9/5
Step-by-Step
- Start with your value in Kelvin (K).
- K × 9/5 to perform the conversion.
- The result is your value expressed in Rankine (°R).
Conversion Factor
1 K = 1.8 °R
Reverse Factor
1 °R = 0.555556 K
Worked Example
Convert 25 Kelvin to Rankine: 25 K = 45 °R
About Kelvin (K)
The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Named after Lord Kelvin and defined since 2019 by fixing the numerical value of the Boltzmann constant. Kelvin shares its degree interval with Celsius (1 K = 1°C), so conversion is a straight offset. Scientific publications, thermodynamic formulas, cryogenic physics, and plasma physics exclusively use kelvin because absolute-zero-referenced math stays dimensionally clean.
About Rankine (°R)
An absolute temperature scale proposed by Scottish engineer William Rankine in 1859, using the Fahrenheit degree interval but anchored at absolute zero (0°R = −459.67°F). Rankine is primarily used in US engineering — combustion analysis, HVAC thermodynamics, rocket propulsion, and steam-cycle calculations — where both absolute referencing and Fahrenheit-compatible arithmetic matter. It's the temperature analog of the US customary system the way Kelvin is the metric equivalent, and appears in most US mechanical-engineering textbooks.
Quick Facts
- 1 Kelvin equals 1.8 Rankine
- 1 Rankine equals 0.555556 Kelvin
- Kelvin is a unit of temperature
- Rankine is a unit of temperature
- This conversion is commonly used in weather forecasting, cooking, scientific experiments, and HVAC
- The Kelvin belongs to the metric system
- The Rankine belongs to the imperial system
Common Kelvin to Rankine Conversions
| Kelvin (K) | Rankine (°R) |
|---|---|
| -40 | -72 |
| -20 | -36 |
| -10 | -18 |
| 0 | 5.684342e-14 |
| 5 | 9 |
| 10 | 18 |
| 15 | 27 |
| 20 | 36 |
| 25 | 45 |
| 30 | 54 |
| 35 | 63 |
| 37 | 66.6 |
| 40 | 72 |
| 50 | 90 |
| 60 | 108 |
| 70 | 126 |
| 80 | 144 |
| 90 | 162 |
| 100 | 180 |
| 150 | 270 |
| 200 | 360 |
Understanding Kelvin
The Kelvin (symbol: K) is a unit of temperature. The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Named after Lord Kelvin and defined since 2019 by fixing the numerical value of the Boltzmann constant. Kelvin shares its degree interval with Celsius (1 K = 1°C), so conversion is a straight offset. Scientific publications, thermodynamic formulas, cryogenic physics, and plasma physics exclusively use kelvin because absolute-zero-referenced math stays dimensionally clean.
It belongs to the metric measurement system.
Kelvin are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Understanding Rankine
The Rankine (symbol: °R) is a unit of temperature. An absolute temperature scale proposed by Scottish engineer William Rankine in 1859, using the Fahrenheit degree interval but anchored at absolute zero (0°R = −459.67°F). Rankine is primarily used in US engineering — combustion analysis, HVAC thermodynamics, rocket propulsion, and steam-cycle calculations — where both absolute referencing and Fahrenheit-compatible arithmetic matter. It's the temperature analog of the US customary system the way Kelvin is the metric equivalent, and appears in most US mechanical-engineering textbooks.
It belongs to the imperial measurement system.
Rankine are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Why Convert Kelvin to Rankine?
Converting between Kelvin and Rankine is essential for a variety of everyday and professional tasks. International recipes list oven temperatures in different scales, weather reports from other countries use unfamiliar units, and scientists must reconcile data recorded under different conventions. Medical professionals also compare body temperature readings that may be reported in different units depending on the country or device.
Frequently Asked Questions
How do I convert Kelvin to Rankine?
The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. To convert Kelvin to Rankine, K × 9/5. For example, 25 K equals 45 °R.
How many Rankine are in 1 Kelvin?
There are 1.8 Rankine in 1 Kelvin.
How many Kelvin are in 1 Rankine?
There are 0.555556 Kelvin in 1 Rankine.
What is the formula for Kelvin to Rankine conversion?
The formula is: K × 9/5. This means 1 K = 1.8 °R.
Is a Kelvin bigger than a Rankine?
No. One Kelvin is smaller than one Rankine because 1 K equals 1.8 °R, which is greater than 1.
When do you need to convert between Kelvin and Rankine?
An absolute temperature scale proposed by Scottish engineer William Rankine in 1859, using the Fahrenheit degree interval but anchored at absolute zero (0°R = −459. Kelvin and Rankine are both temperature units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.