Celsius to Kelvin Converter
To convert Celsius to Kelvin, use the formula K = C + 273.15. For example, 25 Celsius equals 298.15 Kelvin. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
K = C + 273.15
Use the temperature formula to convert Celsius values to Kelvin.
Example Conversions
0 Celsius (C)
273.15 Kelvin (K)
1 Celsius (C)
274.15 Kelvin (K)
25 Celsius (C)
298.15 Kelvin (K)
100 Celsius (C)
373.15 Kelvin (K)
212 Celsius (C)
485.15 Kelvin (K)
Conversion Table
| Celsius (C) | Kelvin (K) |
|---|---|
| 0 | 273.15 |
| 1 | 274.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 32 | 305.15 |
| 37 | 310.15 |
| 50 | 323.15 |
| 75 | 348.15 |
| 100 | 373.15 |
| 212 | 485.15 |
| 273.15 | 546.3 |
How to Convert Manually
Use these steps to convert Celsius values to Kelvin without the calculator.
- Write down the value in Celsius (C) that you want to convert.
- Apply the formula: K = C + 273.15.
- For example, converting 10 Celsius gives 283.15 Kelvin.
- Label the result as Kelvin (K).
About Celsius and Kelvin
The degree Celsius is the SI temperature unit for everyday use, with 0 °C at the freezing point and 100 °C at the boiling point of water at standard pressure. It is offset from the kelvin by exactly 273.15. The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant. Its zero point is absolute zero, and one kelvin equals one degree Celsius in size. The two scales are related by the formula K = C + 273.15, not a fixed factor. Celsius to Kelvin conversion comes up most often in weather forecasts outside the US and in cooking and oven settings in metric countries, typically when figures need restating for physics and chemistry calculations.
Precision and Rounding: Temperature conversions are formula-based, not factor-based, so apply the full formula before rounding. Whole degrees are fine for weather and cooking; lab work, medicine, and HVAC commissioning usually carry one or two decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Celsius equals 288.15 Kelvin.
15 C -> 288.15 K
FAQ
How do I convert Celsius to Kelvin?
Use the temperature formula to convert Celsius values to Kelvin.
What is the formula for Celsius to Kelvin?
The formula is K = C + 273.15.
How many Kelvin are in 1 Celsius?
1 Celsius equals 274.15 Kelvin.
Can I convert Kelvin back to Celsius?
Yes. 1 Kelvin equals -272.15 Celsius, and the related converter can reverse the calculation.
What are common names for Celsius and Kelvin?
Celsius is shown as C and may also be searched as celsius, centigrade, °C. Kelvin is shown as K and may also be searched as kelvin, °K.
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