Temperature
°CtoK
Convert degrees Celsius (°C) to kelvin (K).
Converter
°C
Accepts numbers or expressions, e.g. 150 + 14.7
Result
K
Rendered to 6 significant figures.
Formula
Formula
K = °C + 273.15
Temperature conversions involve different scale zero-points, so a single multiplicative factor does not exist. Apply the formula to each value individually.
Worked example
Convert 25 °C to K.
- 0125 + 273.15 = 298.1500 K
Result25 °C = 298.15 K
Conversion table
| °C | K |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| 0 | 273.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 50 | 323.15 |
| 100 | 373.15 |
| 150 | 423.15 |
| 200 | 473.15 |
| 500 | 773.15 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the formula to convert °C to K?
Temperature conversions are not a single multiplier because the scales have different zero points. Use K = °C + 273.15 to convert any value of °C to K.
How do I convert 1 °C to K?
1 °C corresponds to 274.15 K. Apply the formula K = °C + 273.15 to your value.
How do I convert K back to °C?
Use the inverse formula. For example, to go from K back to °C, rearrange K = °C + 273.15 for °C. See the K to °C page for the direct formula.
When would I need to convert degree Celsius to kelvin?
Temperature scale conversions are routine in process engineering: instrumentation often reads in °C or °F, while thermodynamic calculations (gas laws, enthalpy) require absolute units (K or °R). Always use absolute units for any equation involving a ratio of temperatures.
Is the conversion exact?
Yes — the temperature scale relationships are exact by definition (the Celsius–Kelvin offset is 273.15 exactly; the Fahrenheit–Rankine offset is 459.67 exactly).