How to convert degrees Celsius to kelvins
K = °C + 273.15Temperature scales have different zero points, so the conversion needs an offset as well as a scale factor. In one step: K = °C × 1 + 273.15.
Worked examples
- 0 degrees Celsius0 + 273.15 = 273.15 K
- 20 degrees Celsius20 + 273.15 = 293.15 K
- 37 degrees Celsius37 + 273.15 = 310.15 K
- 100 degrees Celsius100 + 273.15 = 373.15 K
- −40 degrees Celsius(−40) + 273.15 = 233.15 K
Degrees Celsius to kelvins conversion table
Values are calculated by the conversion engine using the full formula and rounded to 8 significant figures.
| 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 |
| −5 °C | 268.15 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 |
| Degrees Celsius (°C) | Kelvins (K) |
|---|---|
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 60 °C | 333.15 K |
| 70 °C | 343.15 K |
| 80 °C | 353.15 K |
| 90 °C | 363.15 K |
| 100 °C | 373.15 K |
| 150 °C | 423.15 K |
| 180 °C | 453.15 K |
| 200 °C | 473.15 K |
| 250 °C | 523.15 K |
About the units
Degree Celsius (°C)
Defined as the kelvin temperature minus 273.15. Water freezes at 0 °C and boils at about 100 °C at sea level; normal body temperature is about 37 °C.
Kelvin (K)
The SI base unit of thermodynamic temperature, defined by fixing the Boltzmann constant. 0 K is absolute zero; a kelvin is the same size as a Celsius degree.
Frequently asked questions
What is the formula to convert degrees Celsius to kelvins?
K = °C + 273.15. Temperature scales have different zero points, so the conversion needs an offset as well as a scale factor. In one step: K = °C × 1 + 273.15.
What is 20 degrees Celsius in kelvins?
20 °C = 293.15 K.
What is 0 °C in K?
0 °C = 273.15 K.
Can I just multiply to convert degrees Celsius to kelvins?
No. °C and K have different zero points, so a single multiplication gives the wrong answer. Use the full formula above, or the converter. To convert a temperature difference (such as a 10-degree rise), use the temperature interval converter instead.
Is this °C to K converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.