Convert Fahrenheit to Rankine
Convert Fahrenheit to Rankine by adding 459.67. Perfect for thermodynamics and combustion calculations.
How to Convert Fahrenheit to Rankine
To convert Fahrenheit to Rankine, add 459.67 to the Fahrenheit value.
Conversion Formula:
value + 459.67Understanding the Conversion
Fahrenheit to Rankine is one of the simplest temperature conversions because both scales use the same degree size. Rankine is effectively Fahrenheit shifted down to absolute zero. By adding 459.67, you relocate the Fahrenheit reading to the absolute scale without changing the interval size.
The formula is °R = °F + 459.67. This means 0°F equals 459.67°R, 32°F equals 491.67°R, and 212°F equals 671.67°R. The straightforward addition makes this conversion easy to apply in thermodynamic equations, steam tables, or combustion models that require absolute temperatures but are aligned with Fahrenheit increments.
Use this conversion for U.S.-based engineering work, Rankine-specific diagrams, gas law calculations, or any process modeling where Rankine is preferred. Because there is no scaling, the converter simply applies the fixed offset with full decimal precision.
Tip: if you know the Kelvin value, you can also convert Fahrenheit to Kelvin first and then multiply by 9/5 to reach Rankine. The direct addition is faster when starting with Fahrenheit.
Conversion Examples
Example: Convert 68°F to Rankine
- Step 1: Add 459.67 to 68.
- Step 2: 68 + 459.67 = 527.67.
- Step 3: Result is 527.67°R.
68°F = 527.67°R
Shows a common indoor temperature moved to the absolute Fahrenheit-based scale.
Example: Convert 32°F to Rankine
- Step 1: 32 + 459.67 = 491.67.
- Step 2: No scaling required.
- Step 3: Result is 491.67°R.
32°F = 491.67°R
Freezing point of water expressed in Rankine.
Example: Convert -40°F to Rankine
- Step 1: -40 + 459.67 = 419.67.
- Step 2: Result remains positive on the absolute scale.
- Step 3: Final value is 419.67°R.
-40°F = 419.67°R
Illustrates that absolute scales stay positive even for extreme cold.
Conversion Formula
Rankine shares Fahrenheit’s degree size but starts at absolute zero. Adding 459.67 shifts any Fahrenheit reading up to that absolute baseline without changing the scale.
Conversion Chart
| Fahrenheit | Rankine |
|---|---|
| -40 | 419.67 |
| 0 | 459.67 |
| 32 | 491.67 |
| 68 | 527.67 |
| 77 | 536.67 |
| 98.6 | 558.27 |
| 122 | 581.67 |
| 150 | 609.67 |
| 212 | 671.67 |
| 451 | 910.67 |
Quick Conversion Tip
Just add 459.67. No multiplication or division is needed because degree sizes are identical.
Unit Definitions
Fahrenheit (°F)
Imperial scale with 32°F at freezing and 212°F at boiling.
Add 459.67 to convert to Rankine. Subtract 32 and multiply by 5/9 to convert to Celsius; subtract 32, multiply by 5/9, and add 273.15 to reach Kelvin.
Rankine (°R)
Absolute temperature scale using Fahrenheit-sized degrees, starting at absolute zero.
Rankine to Fahrenheit subtracts 459.67. Rankine to Kelvin multiplies by 5/9. Rankine to Celsius subtracts 491.67 then multiplies by 5/9.
Common Use Cases
- Thermodynamics equations that expect Rankine inputs.
- Combustion and heat engine analyses using Fahrenheit-based absolutes.
- Steam table references and HVAC engineering documentation.
- Educational problems involving Rankine cycles.
- Quality assurance where equipment specs list Rankine.
Frequently Asked Questions
Why exactly 459.67?
0°F is 459.67 degrees above absolute zero. Adding this fixed offset moves the value to the absolute Rankine scale.
Do I need to multiply or divide?
No. Fahrenheit and Rankine use the same degree size, so only an offset is required.
Can Rankine be used for weather?
It can, but it is uncommon. Rankine is mainly for engineering and thermodynamics; Celsius and Fahrenheit are standard for weather.