Fahrenheit to Rankine
Convert Fahrenheit to Rankine — type a temperature in either box. The formula is °R = °F + 459.67.
How to use
- Enter a temperature in the Fahrenheit field.
- The Rankine value updates instantly.
- Negative values work exactly the same way.
- Check the reference table for the fixed points.
Fahrenheit to Rankine formula
Temperature is the one conversion that needs more than a multiplication: the scales disagree about where zero sits, so an offset is required as well as a ratio.
°R = °F + 459.67
The order of operations matters: follow the formula exactly as written above.
Worked example
Converting 20 °F gives 479.67 °R.
20 °F → 479.67 °R
Reference points
Four temperatures worth memorizing, in both scales:
| Reference point | Fahrenheit | Rankine |
|---|---|---|
| water freezing | 32 °F | 491.67 °R |
| a mild room | 68 °F | 527.67 °R |
| body temperature | 98.6 °F | 558.27 °R |
| water boiling | 212 °F | 671.67 °R |
What is a degree Fahrenheit?
Fahrenheit is the everyday temperature scale in the United States, with water freezing at 32 °F and boiling at 212 °F.
Definition: Defined against Celsius: °F = °C × 9/5 + 32. The 180-degree span between freezing and boiling gives it finer granularity than Celsius.
Where it is used: US weather, cooking, oven settings and body temperature.
Worth knowing: The two scales cross at −40°, where −40 °C and −40 °F are the same temperature.
What is a degree Rankine?
Rankine is an absolute temperature scale that uses Fahrenheit-sized degrees, starting at absolute zero.
Definition: 0 °R is absolute zero and one degree Rankine equals one degree Fahrenheit, so °R = °F + 459.67.
Where it is used: US thermodynamics and aerospace engineering, where absolute temperature is needed but Fahrenheit degrees are the working convention.
Frequently asked questions
What is the formula to convert Fahrenheit to Rankine?
Use °R = °F + 459.67.
What is 0 °F in Rankine?
0 °F is 459.67 °R.
What is 100 °F in Rankine?
100 °F is 559.67 °R.
Does this work for negative temperatures?
Yes. The formula is linear, so it is valid above and below zero on either scale.
Is there anything to watch out for with fahrenheit?
The two scales cross at −40°, where −40 °C and −40 °F are the same temperature.