Celsius to Kelvin
To convert Celsius to kelvin, add 273.15. The steps are the same size, so 0 °C is 273.15 K and 100 °C is 373.15 K.
K = °C + 273.15
By Piero Nanni · Last checked
Celsius to Kelvin Calculator
20°C = 293.15K
How to Convert Celsius to Kelvin
Formula:
K = °C + 273.15
Worked example:
20 + 273.15 = 293.15 K
Celsius to Kelvin Conversion Table
| °C | K |
|---|---|
| -273.15 | 0 |
| -250 | 23.15 |
| -225 | 48.15 |
| -200 | 73.15 |
| -175 | 98.15 |
| -150 | 123.15 |
| -125 | 148.15 |
| -100 | 173.15 |
| -75 | 198.15 |
| -50 | 223.15 |
| -40 | 233.15 |
| -25 | 248.15 |
| -20 | 253.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 37 | 310.15 |
| 50 | 323.15 |
| 75 | 348.15 |
| 100 | 373.15 |
| 125 | 398.15 |
| 150 | 423.15 |
| 175 | 448.15 |
| 200 | 473.15 |
| 225 | 498.15 |
| 250 | 523.15 |
| 275 | 548.15 |
| 300 | 573.15 |
| 325 | 598.15 |
| 350 | 623.15 |
| 375 | 648.15 |
| 400 | 673.15 |
| 425 | 698.15 |
| 450 | 723.15 |
| 475 | 748.15 |
| 500 | 773.15 |
| 525 | 798.15 |
| 550 | 823.15 |
| 575 | 848.15 |
| 600 | 873.15 |
| 625 | 898.15 |
| 650 | 923.15 |
| 675 | 948.15 |
| 700 | 973.15 |
| 725 | 998.15 |
| 750 | 1023.15 |
| 775 | 1048.15 |
| 800 | 1073.15 |
| 825 | 1098.15 |
| 850 | 1123.15 |
| 875 | 1148.15 |
| 900 | 1173.15 |
| 925 | 1198.15 |
| 950 | 1223.15 |
| 975 | 1248.15 |
| 1000 | 1273.15 |
About This Conversion
Kelvin is the SI base unit of temperature and is used wherever temperature enters a physical calculation: gas laws, thermodynamics, blackbody radiation, colour temperature of light sources. Because a kelvin and a degree Celsius are the same size, the conversion is a pure offset of 273.15 with no scaling at all.
One convention detail matters in scientific writing: kelvin takes no degree sign and no "degrees". You write 293 K, not 293 °K. A temperature difference of 5 °C is also a difference of exactly 5 K, which is why heat-transfer formulas can use either unit for a delta.
Frequently Asked Questions
What is 0 °C in Kelvin?
0 °C is 273.15 K, the freezing point of water at standard pressure.
What is room temperature in Kelvin?
Room temperature of about 20 °C is roughly 293 K; the 25 °C used as standard lab conditions is 298.15 K.
Can Kelvin be negative?
No. 0 K is absolute zero, the lowest possible temperature, equal to −273.15 °C.
Why is there no degree symbol on Kelvin?
Kelvin is an absolute scale rather than a relative one, so by SI convention it is written as a plain unit: 300 K, not 300 °K.
Sources
Worth Knowing
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