40 Fahrenheit to Rankine – Answer and Calculator Tool

40 degrees Fahrenheit is equal to 500.67 degrees Rankine.

The conversion from Fahrenheit to Rankine involves adding 459.67 to the Fahrenheit temperature because Rankine scale starts at absolute zero like Kelvin, but uses Fahrenheit-sized increments.

Conversion Tool

Conversion Formula

The formula to convert Fahrenheit (°F) to Rankine (°R) is:

°R = °F + 459.67

This works because Rankine scale is an absolute temperature scale starting at absolute zero, like Kelvin, but it uses the Fahrenheit degree size. Since absolute zero is -459.67°F, adding 459.67 shifts Fahrenheit values to Rankine.

For example, converting 40°F:

• Start with 40°F
• Add 459.67 to it: 40 + 459.67 = 499.67
• The result is 499.67°R

Conversion Example

• Convert 70°F to Rankine:
  • Take the Fahrenheit value: 70
  • Add 459.67: 70 + 459.67 = 529.67°R
  • Result: 529.67°R
• Convert -10°F to Rankine:
  • Start with -10
  • Add 459.67: -10 + 459.67 = 449.67°R
  • Result: 449.67°R
• Convert 100°F to Rankine:
  • Take 100
  • Add 459.67: 100 + 459.67 = 559.67°R
  • Result: 559.67°R
• Convert 32°F to Rankine:
  • Take 32
  • Add 459.67: 32 + 459.67 = 491.67°R
  • Result: 491.67°R

Conversion Chart

This chart shows Fahrenheit values from 15.0 to 65.0 and their equivalent Rankine values. To use it, find the Fahrenheit temperature in the left column and read across to see its Rankine equivalent.

Related Conversion Questions

• How many Rankine degrees equal 40 degrees Fahrenheit?
• What is the formula to convert 40°F to Rankine scale?
• Is 40 degrees Fahrenheit warmer or cooler than 500 Rankine?
• Can I convert 40°F directly to Rankine using addition?
• Why do I add 459.67 to convert 40 Fahrenheit to Rankine?
• What is the Rankine temperature at 40°F, rounded to 2 decimals?
• How does 40°F compare to Rankine temperature scale values?

Conversion Definitions

Fahrenheit: Fahrenheit is a temperature scale where water freezes at 32 degrees and boils at 212 degrees under standard atmospheric pressure. It is commonly used in the United States for weather forecasts, cooking temperatures, and industrial applications. Each degree Fahrenheit is 1/180 the interval between freezing and boiling points of water.

Rankine: Rankine is an absolute temperature scale based on the Fahrenheit degree size. It starts at absolute zero, the lowest possible temperature where molecular motion stops, which equals 0°R. This scale is used mainly in thermodynamics and engineering fields in the United States to measure absolute temperatures.

Conversion FAQs

Why does the Rankine scale start at 0 when Fahrenheit goes below zero?

The Rankine scale begins at absolute zero, which is the lowest temperature possible, -459.67°F. So while Fahrenheit can have negative values, Rankine adjusts by adding 459.67, making absolute zero 0°R. This allows measurements related to energy and thermodynamics to be more precise.

Can I convert Rankine back to Fahrenheit? How?

Yes, to convert Rankine back to Fahrenheit, subtract 459.67 from the Rankine value. For example, if you have 500°R, then Fahrenheit equals 500 – 459.67 = 40.33°F. This reverses the initial conversion formula.

Is Rankine used outside of engineering fields?

Rankine scale is mostly limited to engineering and scientific contexts, especially in the United States. Unlike Celsius or Fahrenheit, Rankine isn’t common in everyday use or weather reporting, because it measures absolute temperatures related to thermodynamic calculations.

Why add 459.67 and not a different number?

The value 459.67 corresponds exactly to the temperature difference between absolute zero and the zero point on the Fahrenheit scale. Since Rankine uses the Fahrenheit degree size, adding 459.67 shifts the scale so 0°R equals absolute zero.

Does the conversion formula change based on pressure or altitude?

No, the conversion between Fahrenheit and Rankine is a simple linear shift and does not depend on environmental factors like pressure or altitude. Both scales measure temperature directly, so the formula remains constant.