-40 Celsius to Kelvin
-40 °C = 233.15 K
-40 degrees Celsius equals 233.15 kelvins.
How to convert -40 °C to K
Use the formula K = °C + 273.15:
K = -40 + 273.15K = 233.15
So -40 °C = 233.15 K.
Rounded values and quick estimate
- Rounded to a whole number: 233 K
- Rounded to one decimal place: 233.2 K
This conversion is exact, so there is no need to estimate: just add or subtract 273.15.
-40 Celsius 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
- Fahrenheit
- -40 °F
- Rankine
- 419.67 °R
-40 °C and nearby values
| Celsius | Kelvin |
|---|---|
| -44 °C | 229.15 K |
| -43 °C | 230.15 K |
| -42 °C | 231.15 K |
| -41 °C | 232.15 K |
| -40 °C | 233.15 K |
| -39 °C | 234.15 K |
| -38 °C | 235.15 K |
| -37 °C | 236.15 K |
| -36 °C | 237.15 K |
About celsius and kelvin
The Celsius scale sets the freezing point of water at 0 °C and its boiling point at 100 °C (at sea level). It is used for everyday temperatures in almost every country.
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 Celsius in Kelvin?
-40 degrees Celsius is 233.15 kelvins (-40 °C = 233.15 K).
How do you convert -40 °C to K?
Apply K = °C + 273.15: K = -40 + 273.15, K = 233.15.
How many degrees Celsius is 233.15 K?
233.15 K is about -40 degrees Celsius.