Kelvin to Rankine Converter
Enter the value that you want to convert kelvin (K) to Rankine (°R) or Rankine to kelvin.Also written as K to °R conversion.
1 kelvin = 1.8000000 Rankine
Formula: °R = K × 9/5
K to °R — kelvin to Rankine
10 kelvin = 18.00000 Rankine
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Why Convert Kelvin to Rankine?
The Kelvin Explained
The Kelvin scale begins at absolute zero (−273.15°C) — the theoretical lowest possible temperature where all molecular motion ceases.
Kelvin (K) is the SI base unit of temperature, essential in physics, chemistry, and engineering. It uses the same increment size as Celsius but starts at absolute zero. Key values: 0 K = absolute zero, 273.15 K = water freezes, 373.15 K = water boils. Kelvin is required for gas law calculations (PV=nRT), thermodynamic efficiency, color temperature in photography/lighting (5500K = daylight), and cryogenic engineering.
The Rankine Explained
The Rankine scale is the Fahrenheit-based absolute temperature scale, starting at absolute zero (0°R = −459.67°F).
Developed by Scottish engineer William Rankine in 1859, the Rankine scale (°R) is used primarily in American engineering for thermodynamic calculations. It relates to Fahrenheit as Kelvin relates to Celsius — same degree size but offset to absolute zero. The Rankine cycle (steam power plant efficiency) and some US aerospace engineering calculations use this scale. To convert: °R = °F + 459.67.
Temperature Scales in Context
Temperature conversion is one of the few non-linear unit conversions people encounter daily. Celsius dominates scientific work and most countries, Fahrenheit remains standard in the US for weather and cooking, Kelvin is required in thermodynamics and gas law calculations, and Rankine appears in some US engineering applications. Converting between these scales requires formulas rather than simple multiplication.
kelvin to Rankine metric conversion table
| 0.01 K | = | 0.01800 °R |
| 0.1 K | = | 0.18000 °R |
| 1 K | = | 1.80000 °R |
| 2 K | = | 3.60000 °R |
| 3 K | = | 5.40000 °R |
| 4 K | = | 7.20000 °R |
| 5 K | = | 9.00000 °R |
| 6 K | = | 10.80000 °R |
| 7 K | = | 12.60000 °R |
| 8 K | = | 14.40000 °R |
| 9 K | = | 16.20000 °R |
| 10 K | = | 18.00000 °R |
| 11 K | = | 19.80000 °R |
| 12 K | = | 21.60000 °R |
| 13 K | = | 23.40000 °R |
| 14 K | = | 25.20000 °R |
| 15 K | = | 27.00000 °R |
| 16 K | = | 28.80000 °R |
| 17 K | = | 30.60000 °R |
| 18 K | = | 32.40000 °R |
| 19 K | = | 34.20000 °R |
| 20 K | = | 36.00000 °R |
| 30 K | = | 54.00000 °R |
| 40 K | = | 72.00000 °R |
| 50 K | = | 90.00000 °R |
| 60 K | = | 108.00000 °R |
| 70 K | = | 126.00000 °R |
| 80 K | = | 144.00000 °R |
| 90 K | = | 162.00000 °R |
| 100 K | = | 180.00000 °R |
| 200 K | = | 360.00000 °R |
| 300 K | = | 540.00000 °R |
| 400 K | = | 720.00000 °R |
| 500 K | = | 900.00000 °R |
| 600 K | = | 1080.00000 °R |
| 700 K | = | 1260.00000 °R |
| 800 K | = | 1440.00000 °R |
| 900 K | = | 1620.00000 °R |
| 1000 K | = | 1800.00000 °R |
How to Convert K to °R (Kelvin to Rankine)?
We can convert kelvin to Rankine by using an example.
Example:
Convert 20 Kelvin to Rankine?
We know 1 Kelvin = 1.8000000 Rankine; 1 Rankine = 0.5555556 kelvin.
20 kelvin = ___°R
20 × 1.8000000 = 36.00000 °R (we know 1 kelvin = 1.8000000 Rankine)
Answer:
20 kelvin = 36.00000 Rankine
Kelvin to Rankine Conversion
Both are absolute scales (starting at 0 for absolute zero) but with different degree sizes. Multiply by 9/5:
- Write down the Kelvin temperature.
- Multiply by 9/5 (or 1.8).
- The result is Rankine.
Solved Examples
Question 1: Convert 273.15 K (water freezing) to Rankine.
Solution:
°R = K × 9/5
= 273.15 × 1.8
Answer: 273.15 K = 491.67°R
Question 2: Convert 373.15 K (water boiling) to Rankine.
Solution:
°R = 373.15 × 1.8
Answer: 373.15 K = 671.67°R
Question 3: Convert 0 K to Rankine.
Solution:
°R = 0 × 1.8
= 0
Answer: 0 K = 0°R (absolute zero in both scales)
Practice Questions
Try solving these on your own to test your understanding:
- Convert 300 K to Rankine. (Answer: 540°R)
- Convert 77 K to Rankine. (Answer: 138.6°R)
- What is 500 K in Rankine? (Answer: 900°R)
Bridging SI and Imperial Thermodynamics
When converting between SI (Kelvin-based) and imperial (Rankine-based) thermodynamic data, K×1.8=°R is the key relationship. Steam tables published in SI units use Kelvin; American editions use Rankine. Specific heat values, entropy, and enthalpy all change units when switching systems. This conversion bridges international engineering collaboration.
Key Takeaways
- °R = K × 9/5 (multiply by 1.8).
- Both start at absolute zero (0 K = 0°R).
- 273.15 K = 491.67°R (water freezes).
- Pure ratio conversion — no offset needed.
Kelvin to Rankine Conversion Formula
°R = K × 9/5
1 kelvin = 1.8000000 Rankine
1 Rankine = 0.5555556 kelvin
Frequently Asked Questions
How many Rankine are in 1 kelvin?
1 kelvin equals 1.80000 Rankine. Note: Temperature conversion uses a formula, not simple multiplication.
How do I convert kelvin to Rankine?
Use the conversion formula shown above. For example, 9.00 Rankine equals 5 kelvin. Temperature scales have different zero points, so a formula (not simple multiplication) is required.
How do I convert Rankine to kelvin?
Use the reverse formula. 1 Rankine equals 0.55556 kelvin. See the formula section above for the exact equation.
What is 10 kelvin in Rankine?
10 kelvin is equal to 18.00000 Rankine.
What is 100 kelvin in Rankine?
100 kelvin is equal to 180.00000 Rankine.