Celsius to Rankine Converter
Formula
°R = (°C + 273.15) × 9/5
Rankine is the Fahrenheit equivalent of Kelvin — starts at absolute zero but uses Fahrenheit-sized degrees.
How to use
- Enter the temperature in the Celsius field.
- The Rankine value updates automatically.
- Read the converted temperature in degrees Rankine.
Example
100°C converts to 671.67°R ((100 + 273.15) × 9/5), the boiling point of water on the Rankine scale.
Frequently Asked Questions
What is the Rankine scale?
Rankine starts at absolute zero like Kelvin but uses Fahrenheit degree increments. Used in some engineering applications.
Where is the Rankine scale actually used today?
Rankine appears mainly in certain US engineering fields, especially thermodynamics, aerospace, and HVAC work that already uses Fahrenheit. Because it's an absolute scale with Fahrenheit-sized degrees, it lets engineers plug temperatures directly into gas-law and thermal equations that require absolute values without switching to metric. Outside those niche applications it's rarely encountered in daily life.
How does Rankine compare to Kelvin?
Both Rankine and Kelvin start at absolute zero, but Rankine uses Fahrenheit-sized degrees while Kelvin uses Celsius-sized ones, so a Rankine degree is exactly 5/9 the size of a Kelvin. To convert directly, multiply a Kelvin value by 1.8 to get Rankine, or multiply Rankine by 5/9 to get Kelvin. For example, 300 K equals 540°R.