Celsius to Kelvin Converter
°C → K · 🌡️ Temperature
1 Celsius = 274.15 Kelvin
How to convert Celsius to Kelvin
To convert Celsius to Kelvin, add 273.15. For example, 0°C = 273.15 K.
If you need to convert from Celsius to Kelvin, the key figure to remember is that one Celsius equals 274.15 Kelvin. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert °C to K with complete confidence.
Temperature conversions come up constantly in cooking, weather, science, and travel. Unlike most unit conversions, temperature scales don't share a common zero point, which is why the formulas involve both multiplication and addition rather than a single multiplier.
Understanding Celsius and Kelvin
Celsius is used by almost every country for weather and cooking, with water freezing at 0°C and boiling at 100°C at sea level. Fahrenheit remains standard in the United States, placing freezing at 32°F and boiling at 212°F. Kelvin is the scientific standard, starting at absolute zero (−273.15°C), the coldest temperature physically possible, and is used throughout physics and chemistry.
How accurate is this conversion?
Temperature conversions are mathematically exact. The relationship between Celsius and Fahrenheit is fixed (°F = °C × 9/5 + 32), as is the offset between Celsius and Kelvin (K = °C + 273.15). There is no measurement uncertainty in the conversion itself.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Celsius to Kelvin values
The most frequently searched conversions are 1 Celsius = 274.15 Kelvin, 5 Celsius = 278.15 Kelvin, 10 Celsius = 283.15 Kelvin, and 100 Celsius = 373.15 Kelvin. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: A useful mental shortcut: to roughly convert Celsius to Fahrenheit, double the Celsius value and add 30. It's not exact, but it's close enough for weather and gets you within a few degrees instantly.
Celsius to Kelvin — Conversion Table
| Celsius (°C) | Kelvin (K) |
|---|---|
| 0.1 °C | 273.25 K |
| 0.25 °C | 273.4 K |
| 0.5 °C | 273.65 K |
| 1 °C | 274.15 K |
| 2 °C | 275.15 K |
| 5 °C | 278.15 K |
| 10 °C | 283.15 K |
| 25 °C | 298.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
| 250 °C | 523.15 K |
| 500 °C | 773.15 K |
| 1000 °C | 1,273.15 K |