-40 Fahrenheit to Rankine
-40 °F = 419.67 °R
-40 degrees Fahrenheit equals 419.67 degrees Rankine.
How to convert -40 °F to °R
Use the formula °R = °F + 459.67:
°R = -40 + 459.67°R = 419.67
So -40 °F = 419.67 °R.
Rounded values and quick estimate
- Rounded to a whole number: 420 °R
- Rounded to one decimal place: 419.7 °R
This conversion is exact, so there is no need to estimate: it uses a fixed offset or the exact 9/5 factor.
-40 Fahrenheit in other units
This is the one temperature where the Celsius and Fahrenheit scales meet: −40 °C is exactly −40 °F. It is a handy way to remember that the two scales are not simply offset from each other.
-40 °C is very cold weather, well below the freezing point of water. It is typical of a hard winter in northern climates; warm layers, gloves and a hat are essential outdoors.
- Rankine
- 419.67 °R
- Degrees Réaumur
- -32 °Ré
- Degrees Delisle
- 210 °De
- Degrees Newton
- -13.2 °N
- Degrees Rømer
- -13.5 °Rø
- Celsius
- -40 °C
- Kelvin
- 233.15 K
-40 °F and nearby values
| Fahrenheit | Rankine |
|---|---|
| -44 °F | 415.67 °R |
| -43 °F | 416.67 °R |
| -42 °F | 417.67 °R |
| -41 °F | 418.67 °R |
| -40 °F | 419.67 °R |
| -39 °F | 420.67 °R |
| -38 °F | 421.67 °R |
| -37 °F | 422.67 °R |
| -36 °F | 423.67 °R |
About fahrenheit and rankine
The Fahrenheit scale puts water’s freezing point at 32 °F and boiling point at 212 °F. It is the everyday temperature scale in the United States.
The Rankine scale starts at absolute zero like Kelvin but uses Fahrenheit-sized degrees (0 °R = −459.67 °F). It is still used in some US engineering work.
Related conversions
Frequently asked questions
What is -40 Fahrenheit in Rankine?
-40 degrees Fahrenheit is 419.67 degrees Rankine (-40 °F = 419.67 °R).
How do you convert -40 °F to °R?
Apply °R = °F + 459.67: °R = -40 + 459.67, °R = 419.67.
How many degrees Fahrenheit is 419.67 °R?
419.67 °R is about -40 degrees Fahrenheit.