About Rankine to Kelvin Conversion
This tool converts Rankine (°R) to Kelvin (K) instantly and accurately. Just type a value and the equivalent appears in real time — useful for everyday checks, study, cooking, and technical work alike.
K = °R × 5/9Why Use This Converter
- Work with thermodynamics and heat-transfer calculations
- Bridge US customary engineering data with international SI standards
- Interpret values from textbooks and older technical literature
Common Use Cases
Engineering & Thermo
Textbooks & Specs
International Standards
How to Use the Converter
Enter the Rankine value
Type your temperature in the input field. Decimals and negative values are fully supported.
Read the Kelvin result
The equivalent in Kelvin appears instantly as you type — no calculate button needed.
Copy or swap
Click copy to save the result to your clipboard, or use the swap button to reverse the direction and convert Kelvin back to Rankine.
Quick Reference Points
| Rankine | Kelvin |
|---|---|
| 0°R | 0 K |
| 180°R | 100 K |
| 491.67°R | 273.15 K |
| 540°R | 300 K |
| 900°R | 500 K |
| 1800°R | 1000 K |
Converter Features
Real-Time Conversion
Results update as you type, so you can compare several temperatures quickly without pressing any button.
Two-Way Conversion
The swap button instantly reverses the direction, turning the tool into a Kelvin to Rankine converter without leaving the page.
One-Click Copy
Copy the converted value to your clipboard with a single click and paste it into documents, messages, or other apps.
Accurate Calculation
Conversions use the exact mathematical formula and are rounded to 4 decimal places for practical, reliable accuracy.
Mobile-Friendly
Large touch targets and a responsive layout make the converter easy to use on phones and tablets, even while cooking or on the go.
Private & Offline
All calculations run locally in your browser. Nothing is sent to a server, and the tool keeps working once loaded, even without internet.
Frequently Asked Questions
What is the formula?
The formula is K = °R × 5/9. Divide the Rankine value by 1.8 (multiply by 5/9).
Why is the ratio 5/9?
Celsius degrees are 5/9 the size of Fahrenheit degrees. Kelvin uses Celsius-sized degrees and Rankine uses Fahrenheit-sized degrees, so the same ratio applies.
Do both scales start at absolute zero?
Yes. Both Rankine and Kelvin define zero as absolute zero, which makes the conversion a simple ratio.
Which scale should I use?
Kelvin is the international SI standard, preferred for scientific work. Rankine is mainly used in some US engineering contexts.
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