Celsius to Kelvin Converter
Type a value in degrees Celsius to see it in kelvins as you type, with the exact formula and a reference chart.
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- Degrees Fahrenheit
- 77 °F
How this was calculated
- K = °C + 273.15
- 25 + 273.15 = 298.15 K
| °C | K |
|---|---|
| -273.15 °C | 0 K |
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 37 °C | 310.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
| 200 °C | 473.15 K |
| 500 °C | 773.15 K |
| 1,000 °C | 1,273.15 K |
| K | °C |
|---|---|
| 0 K | -273.15 °C |
| 1 K | -272.15 °C |
| 4 K | -269.15 °C |
| 50 K | -223.15 °C |
| 77 K | -196.15 °C |
| 100 K | -173.15 °C |
| 150 K | -123.15 °C |
| 200 K | -73.15 °C |
| 250 K | -23.15 °C |
| 273.15 K | 0 °C |
| 280 K | 6.85 °C |
| 290 K | 16.85 °C |
How to convert degrees Celsius to kelvins
K = °C + 273.15. Add 273.15 to the degrees Celsius. The Celsius scale puts water's freezing point at 0 °C and boiling at 100 °C at sea level. The kelvin is the SI unit of temperature; 0 K is absolute zero and 0 °C is exactly 273.15 K. The two scales use the same size of degree, so only the zero point moves; there is no multiplication.
Worked examples
- 0 degrees Celsius = 273.15 K (0 + 273.15 = 273.15 K)
- 25 degrees Celsius = 298.15 K (25 + 273.15 = 298.15 K)
- 100 degrees Celsius = 373.15 K (100 + 273.15 = 373.15 K)
Where this conversion comes up
Degrees Celsius are used for weather and cooking outside the US; kelvins for science, color temperature of light bulbs and cameras. Kelvin starts at absolute zero, so the conversion is an addition, not a multiplication. Room temperature (25 °C) is 298.15 K. Kelvins are written without a degree sign.
Quick estimate
Add 273 (exact: 273.15).
Common mistakes
- Writing a degree sign. Kelvins are written as K, not °K, and never go below 0 K.
- Rounding the offset. Use 273.15 exactly; rounding it to 273 shifts every result by 0.15 degrees.
Going the other way? Use the kelvin to celsius converter. Related temperature converters: fahrenheit to kelvin, kelvin to fahrenheit.
Frequently asked questions
How do you convert degrees Celsius to kelvins?
Add 273.15 to the degrees Celsius. For example, 25 degrees Celsius is 298.15 kelvins.
What is the formula for degrees Celsius to kelvins?
K = °C + 273.15. The Celsius scale puts water's freezing point at 0 °C and boiling at 100 °C at sea level. The kelvin is the SI unit of temperature; 0 K is absolute zero and 0 °C is exactly 273.15 K.
What is 100 degrees Celsius in kelvins?
100 degrees Celsius is 373.15 kelvins.
Is there a quick way to estimate degrees Celsius to kelvins?
Add 273 (exact: 273.15).