Fahrenheit to Rankine Converter
Unit ConversionConvert Fahrenheit to Rankine using the exact formula R = F + 459.67.
Rankine
Equivalent temperature in Rankine
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SponsoredThis calculator converts a temperature in Fahrenheit to degrees Rankine using the exact formula: add 459.67 to the Fahrenheit value. Rankine is an absolute temperature scale used mainly in specific US engineering and thermodynamics contexts, where calculations are already built around Fahrenheit sized degrees but still need a scale with no negative values, the same requirement that Kelvin fills for Celsius based work.
Rankine and Kelvin are both absolute scales, meaning 0 on either scale represents absolute zero, the coldest temperature physically possible. The only real difference between them is the size of each degree: a Rankine degree is exactly the same size as a Fahrenheit degree, while a Kelvin degree is the same size as a Celsius degree. Because of this fixed floor, this calculator will never return a result colder than absolute zero: a Fahrenheit value below -459.67°F, which is absolute zero on the Fahrenheit scale, is floored at 0°R rather than producing a physically impossible negative Rankine value.
For the reverse direction, converting a Rankine value back into Fahrenheit, or converting to Celsius or Kelvin instead, see the related converters below.
Fahrenheit to Rankine conversion table
This table spans from absolute zero up through common everyday and scientific reference points.
| Fahrenheit | Rankine |
|---|---|
| -459.67°F | 0°R |
| 0°F | 459.67°R |
| 32°F | 491.67°R |
| 68°F | 527.67°R |
| 98.6°F | 558.27°R |
| 212°F | 671.67°R |
| 1000°F | 1459.67°R |
The Fahrenheit to Rankine formula
To convert Fahrenheit to Rankine, add 459.67 to the Fahrenheit value. For example, 68°F plus 459.67 equals 527.67°R.
To go the other way, from Rankine back to Fahrenheit, subtract 459.67 instead. For example, 527.67°R minus 459.67 equals 68°F. For the Kelvin or Celsius scale instead, use the Rankine to Kelvin or Rankine to Celsius converters below.
Understanding the Rankine scale
The Rankine scale is named after William John Macquorn Rankine, a Scottish engineer and physicist who proposed it in 1859. It was built to solve the same problem Lord Kelvin solved for Celsius: giving engineers an absolute scale, one with a true zero at absolute zero and no negative values, while keeping the familiar Fahrenheit degree size that US engineering calculations already used.
How Rankine relates to the other three scales
Rankine is to Fahrenheit what Kelvin is to Celsius: the same-sized degree, shifted so that zero lands on absolute zero instead of an arbitrary reference point like the freezing point of water. That relationship is a common textbook comparison question, and it is the easiest way to remember how the two absolute scales pair up with their everyday counterparts.
Frequently Asked Questions
What is the formula to convert Fahrenheit to Rankine?
Add 459.67 to the Fahrenheit value. For example, 32°F plus 459.67 equals 491.67°R.
What is 0 degrees Fahrenheit in Rankine?
0°F equals 459.67°R.
Can Rankine ever be a negative number?
No. Rankine is an absolute scale with a true zero point at absolute zero, so negative Rankine values are not physically meaningful. This calculator floors its result at 0°R for any Fahrenheit input below -459.67°F, since that is absolute zero, rather than returning a physically impossible negative value.
Is the Rankine scale the same as the Rankine cycle?
No, and this is a common mix-up. The Rankine scale is a temperature unit, the one this calculator converts. The Rankine cycle is a completely different concept: a thermodynamic model describing how steam turbines and power plants convert heat into mechanical work. Both are named after the same 19th century engineer, William Rankine, which is why they get confused.
Why does Rankine use the same degree size as Fahrenheit?
The Rankine scale was designed specifically for US engineering and thermodynamics work that already used Fahrenheit, so keeping the same degree size meant existing formulas and temperature differences did not need to be rescaled, only shifted to a true zero point.
What is normal human body temperature in Rankine?
Normal human body temperature, about 98.6°F, is approximately 558.27°R.
What is the boiling point of water in Rankine?
Water boils at 671.67°R at standard atmospheric pressure, equivalent to 212°F.
Who created the Rankine scale?
The Rankine scale is named after William John Macquorn Rankine, a Scottish engineer and physicist who proposed the absolute temperature scale in 1859.
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