Rankine to Fahrenheit Converter

Rankine is an absolute temperature scale, like Kelvin, but it uses Fahrenheit-sized degrees. Zero Rankine is absolute zero, the point where all thermal motion stops, which is -459.67 °F. It is used mainly in some US engineering and thermodynamics work where Fahrenheit is the working unit but an absolute scale is needed.

Subtract 459.67 from the Rankine value: °F = °R - 459.67. For example, 491.67 °R is 32 °F, the freezing point of water. To go the other way, add 459.67: °R = °F + 459.67.

Both are absolute scales that start at absolute zero, so they never go negative. The degree size differs: a Rankine degree is 5/9 of a Kelvin degree, the same ratio as Fahrenheit to Celsius. You convert with K = °R x 5/9.

Absolute zero is the coldest possible temperature, 0 °R or -459.67 °F. Nothing can be colder, so a value below that floor has no physical meaning and the converter returns no result. Enter a value at or above absolute zero to get a conversion.