Celsius to Kelvin Converter
Convert Celsius to Kelvin instantly with this free online converter. It applies the exact K = °C + 273.15 formula and shows the result as you type — handy for weather, cooking, and science homework.
menu_bookQuick Reference
- 0 °C = 32 °F = 273.15 K
- 100 °C = 212 °F
- °F = °C × 9/5 + 32
- K = °C + 273.15
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Use the swap button to quickly reverse a conversion. Results update in real time as you type, so there is no need to press a button.
How to Convert Celsius to Kelvin
To convert Celsius to Kelvin, add 273.15: K = °C + 273.15. For example, 25°C + 273.15 = 298.15 K, standard room temperature in many physics problems.
Celsius to Kelvin Conversion Table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 | 0 |
| -100 | 173.15 |
| -40 | 233.15 |
| 0 | 273.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 37 | 310.15 |
| 100 | 373.15 |
| 1000 | 1273.15 |
Frequently Asked Questions
How do you convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature. A Kelvin degree is the same size as a Celsius degree; the scales just start at different zero points.
What is 0°C in Kelvin?
0°C equals 273.15 K — the freezing point of water. Water boils at 373.15 K (100°C) at sea level.
Why does the Kelvin scale start at absolute zero?
0 K (-273.15°C) is absolute zero, the coldest temperature physically possible, where particles have minimal thermal motion. That makes Kelvin an absolute scale with no negative values, which is why science uses it.
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