Celsius to Kelvin Converter
Convert degrees Celsius to kelvins with a two-way calculator. The formula is K = °C + 273.15. The chart below covers freezing, room, body and boiling temperatures.
How to convert degrees Celsius to kelvins
Worked example: convert -5 °C to K. -5 + 273.15 = 268.15 K. Reverse it with °C = K − 273.15.
Degrees celsius to kelvins chart
| Degrees celsius (°C) | Kelvins (K) |
|---|---|
| -40 °C | 233.15 K |
| -30 °C | 243.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| 0 °C | 273.15 K |
| 5 °C | 278.15 K |
| 10 °C | 283.15 K |
| 15 °C | 288.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 35 °C | 308.15 K |
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 60 °C | 333.15 K |
| 80 °C | 353.15 K |
| 100 °C | 373.15 K |
| 150 °C | 423.15 K |
| 180 °C | 453.15 K |
| 200 °C | 473.15 K |
| 220 °C | 493.15 K |
Kelvins to degrees Celsius (reverse)
| Kelvins (K) | Degrees celsius (°C) |
|---|---|
| 0 K | -273.15 °C |
| 100 K | -173.15 °C |
| 200 K | -73.15 °C |
| 250 K | -23.15 °C |
| 255 K | -18.15 °C |
| 273 K | -0.15 °C |
| 273.15 K | 0 °C |
| 280 K | 6.85 °C |
| 290 K | 16.85 °C |
| 293.15 K | 20 °C |
| 300 K | 26.85 °C |
| 310 K | 36.85 °C |
About the degree Celsius and the kelvin
The Celsius scale puts the freezing point of water at 0 degrees and its boiling point at 100 degrees at sea-level pressure. It is used for weather, cooking and science in nearly every country outside the United States.
Kelvin is the SI base unit of temperature and starts at absolute zero, so it has no negative values. A change of one kelvin equals a change of one degree Celsius. Scientists and engineers use it for gas laws, color temperature and cryogenics.
Zero degrees Celsius is 273.15 K, and 100 °C is 373.15 K.
Everyday sizes in degrees Celsius and kelvins
| Everyday example (approximate) | In degrees Celsius | In kelvins |
|---|---|---|
| The coldest air temperature ever recorded | -89.2 °C | 183.95 K |
| A home freezer | -18 °C | 255.15 K |
| Water freezes | 0 °C | 273.15 K |
| A fridge | 4 °C | 277.15 K |
| A comfortable room | 21 °C | 294.15 K |
| A hot summer day | 35 °C | 308.15 K |
| Normal human body temperature | 37 °C | 310.15 K |
| A hot bath | 40 °C | 313.15 K |
Degrees celsius to kelvins FAQ
What is 0 °C in K?
0 °C equals 273.15 K. For reference, 100 °C equals 373.15 K.
How do I convert degrees Celsius to kelvins without a calculator?
convert -5 °C to K. -5 + 273.15 = 268.15 K. Reverse it with °C = K − 273.15. Just add 273 for everyday work, or 273.15 when precision matters. The size of one degree is the same in both scales, so differences do not change.
What is the coldest air temperature ever recorded in kelvins?
The coldest air temperature ever recorded is about -89.2 degrees Celsius, which is 183.95 kelvins. Treat that as an approximate everyday figure rather than an official measurement.
Which scale does my country use, degrees Celsius or kelvins?
Celsius is the everyday scale in almost every country except the United States; 0 °C is 273.15 K. Kelvin has no degree sign and starts at absolute zero (-273.15 °C); it is the same everywhere.