Rankine

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**Rankine temperature conversion formulas**
To find	From	Formula
Fahrenheit	Rankine	°F = °R − 459.67
Rankine	Fahrenheit	°R = °F + 459.67
kelvin	Rankine	K = °R ÷ 1.8
Rankine	kelvin	°R = K × 1.8
Celsius	Rankine	°C = (°R ÷ 1.8) – 273.15
Rankine	Celsius	°R = (°C + 273.15) × 1.8
For temperature intervals rather than specific temperatures, 1 °F = 1 °R and 1 kelvin = 1.8 °R Additional conversion formulas Conversion calculator for units of temperature

See Rankine cycle for the idealized thermodynamic cycle for a steam engine.

Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859.

The symbol is °R (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). As with the Kelvin scale (symbol: K), zero on the Rankine scale is absolute zero, but the Rankine degree is defined as equal to one degree Fahrenheit, rather than the one degree Celsius used by the Kelvin scale. A temperature of negative -459.67 °F is precisely equal to 0 °R.

Many engineering fields in the U.S. measure thermodynamic temperature using the Rankine scale. However, throughout the scientific world where measurements are made in SI units, thermodynamic temperature is measured in Kelvin.