Celsius (°C)
The Celsius scale sets the freezing point of water at 0° and the boiling point at 100° at standard atmospheric pressure.
Celsius is the everyday temperature scale in most countries, on weather forecasts, and in science alongside kelvin.
Celsius to Kelvin
Convert celsius to kelvin instantly. Type in either field — results update live.
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Temperature Celsius Kelvin
1 celsius = 274.15 kelvin
Unit
Unit
Conversion table
Selected °C values converted to K using the exact offset formulas from this tool.
| °C | K |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| 0 | 273.15 |
| 20 | 293.15 |
| 37 | 310.15 |
| 100 | 373.15 |
How to convert
Exact offset formulas in both directions, plus a worked example.
K = °C + 273.15
°C = K − 273.15
Add 273.15 to Celsius to get kelvin.
Subtract 273.15 from kelvin to get Celsius.
Example: convert 37 °C to K
37 °C → 310.15 K (celsius to kelvin)
About these units
Short background on the units used in this conversion.
Kelvin (K)
The kelvin is the SI base unit of thermodynamic temperature, with 0 K at absolute zero and increments the same size as one Celsius degree.
Kelvin appears in physics, chemistry, and engineering wherever absolute temperature is required.
Frequently asked questions
How do I convert celsius to kelvin?
Add 273.15 to Celsius to get kelvin. The formula is
K = °C + 273.15.What is a useful reference point?
0 °C equals 273.15 K (for example, water freezes at 0°C = 32°F = 273.15 K).
Is this Celsius to Kelvin converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All celsius conversions
Jump to any temperature conversion starting from celsius — including the reverse direction and every other unit in our dataset.