# Rankine scale

Rankine scale
Rankine temperature conversion formulae
from Rankine to Rankine
Celsius [°C] = ([R] − 491.67) × 59 [R] = [°C]+273.15 × 95
Fahrenheit [°F] = [R] - 459.67 [R] = [°F] + 459.67
Kelvin [K] = [R] × 59 [R] = [K] × 95
For temperature intervals rather than specific temperatures,
1 R = 1 °F = 59 °C = 59 K
Comparisons among various temperature scales

Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. (The Kelvin scale was first proposed in 1848.)

The symbol for degrees Rankine is R (or Ra if necessary to distinguish it from the Rømer and Réaumur scales). Zero on both the Kelvin and Rankine scales 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 −459.67 °F is exactly equal to 0 R.

Some engineering fields in the U.S. measure thermodynamic temperature using the Rankine scale. However, throughout the entire scientific world thermodynamic temperature is measured in Kelvin. The US National Institute of Standards and Technology does not recommend using degrees Rankine in NIST publications.

Some key temperatures relating the Rankine scale to other temperature scales are shown in the table below.

Kelvin Celsius Fahrenheit Rankine 0 K −273.15 °C −459.67 °F 0 R 273.15 K 0 °C 32 °F 491.67 R 273.16 K 0.01 °C 32.018 °F 491.688 R 373.1339 K 99.9839 °C 211.97102 °F 671.64102 R

## Conversion table between the different temperature units        