Convert Kelvin to Rankine

Convert Kelvin to Rankine instantly by multiplying by 9/5. Ideal for thermodynamics and combustion charts.

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How to Convert Kelvin to Rankine

To convert Kelvin to Rankine, multiply the Kelvin value by 9/5.

Conversion Formula:

value * 9/5

Understanding the Conversion

Kelvin to Rankine converts between two absolute temperature scales. Both start at absolute zero, but Kelvin uses Celsius-sized degrees while Rankine uses Fahrenheit-sized degrees. Because the relationship is purely about degree size, you only need a scaling factor.

The formula is °R = K × 9/5. For example, 273.15 K becomes 491.67°R, 298.15 K becomes 536.67°R, and 373.15 K becomes 671.67°R. No offsets are required because both scales share the same zero point.

Use this conversion in thermodynamics, aerospace, combustion analysis, or any engineering work where data may switch between SI (Kelvin) and Imperial absolute (Rankine) conventions. The converter keeps full precision, making it safe for use in sensitive calculations like efficiency limits or gas property tables.

Mental check: multiply by 1.8 for a quick approximation; the exact factor 9/5 equals 1.8.

Conversion Examples

Example: Convert 298.15 K to Rankine

Step 1: Multiply by 9/5: 298.15 × 9/5.
Step 2: 298.15 × 1.8 = 536.67.
Step 3: Result is 536.67°R.

298.15 K = 536.67°R

Room temperature expressed on the Rankine scale.

Example: Convert 310.15 K to Rankine

Step 1: 310.15 × 9/5 = 558.27.
Step 2: Result is 558.27°R.
Step 3: No additional offset is needed.

310.15 K = 558.27°R

Equivalent to body temperature when expressed in Rankine.

Example: Convert 233.15 K to Rankine

Step 1: 233.15 × 9/5 = 419.67.
Step 2: Result is 419.67°R.
Step 3: Shows absolute zero alignment between scales.

233.15 K = 419.67°R

Demonstrates that extremely cold Kelvin values remain positive in Rankine because both are absolute.

Conversion Formula

Kelvin and Rankine share absolute zero. Degree size is the only difference: Fahrenheit-sized Rankine degrees are 9/5 as large as Kelvin degrees, so you scale by 9/5 without any offset.

Conversion Chart

Kelvin	Rankine
200	360
233.15	419.67
255.37	459.67
273.15	491.67
293.15	527.67
298.15	536.67
303.15	545.67
310.15	558.27
373.15	671.67
400	720

Quick Conversion Tip

Multiply Kelvin by 1.8 to get Rankine. Both scales start at absolute zero.

Unit Definitions

Kelvin (K)

Absolute SI temperature scale starting at absolute zero.

Multiply Kelvin by 9/5 to reach Rankine. Convert Kelvin to Celsius by subtracting 273.15 and to Fahrenheit with (K − 273.15) × 9/5 + 32.

Rankine (°R)

Absolute temperature scale with Fahrenheit-sized degrees.

To Kelvin, multiply by 5/9. To Fahrenheit, subtract 459.67. To Celsius, subtract 491.67 then multiply by 5/9.

Common Use Cases

Thermodynamics calculations switching between SI and Imperial absolute units.
Aerospace and combustion charts that list Rankine values.
Engineering documentation requiring both Kelvin and Rankine.
Academic exercises on absolute temperature relationships.
Quality control when instruments log Kelvin but references use Rankine.

Frequently Asked Questions

Why is there no addition or subtraction?

Both scales share the same zero at absolute zero. Only the degree size differs, so a scale factor is enough.

Is 1 K change the same as 1°R change?

No. 1 K equals 1.8 °R because Rankine uses Fahrenheit-sized increments.

Can I go from Rankine to Kelvin easily?

Yes. Multiply Rankine by 5/9 to return to Kelvin—simply the inverse of this conversion.