-40 Fahrenheit to Kelvin
-40 °F = 233.15 K
-40 degrees Fahrenheit equals 233.15 kelvins.
How to convert -40 °F to K
Use the formula K = (°F − 32) × 5/9 + 273.15:
K = (-40 − 32) × 5/9 + 273.15K = -40 + 273.15K = 233.15
So -40 °F = 233.15 K.
Rounded values and quick estimate
- Rounded to a whole number: 233 K
- Rounded to one decimal place: 233.2 K
-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.
- Kelvin
- 233.15 K
- Degrees Réaumur
- -32 °Ré
- Degrees Delisle
- 210 °De
- Degrees Newton
- -13.2 °N
- Degrees Rømer
- -13.5 °Rø
- Celsius
- -40 °C
- Rankine
- 419.67 °R
-40 °F and nearby values
| Fahrenheit | Kelvin |
|---|---|
| -44 °F | 230.93 K |
| -43 °F | 231.48 K |
| -42 °F | 232.04 K |
| -41 °F | 232.59 K |
| -40 °F | 233.15 K |
| -39 °F | 233.71 K |
| -38 °F | 234.26 K |
| -37 °F | 234.82 K |
| -36 °F | 235.37 K |
About fahrenheit and kelvin
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 kelvin is the SI unit of temperature. It starts at absolute zero (0 K = −273.15 °C) and uses degrees the same size as Celsius, so it never goes negative.
Related conversions
Frequently asked questions
What is -40 Fahrenheit in Kelvin?
-40 degrees Fahrenheit is 233.15 kelvins (-40 °F = 233.15 K).
How do you convert -40 °F to K?
Apply K = (°F − 32) × 5/9 + 273.15: K = (-40 − 32) × 5/9 + 273.15, K = -40 + 273.15, K = 233.15.
How many degrees Fahrenheit is 233.15 K?
233.15 K is about -40 degrees Fahrenheit.