Celsius to Kelvin
Celsius sets 0° at water's freezing point and 100° at its boiling point at sea level, the standard scale in most of the world. Kelvin is the SI base unit of temperature, starting at absolute zero, used throughout science and astronomy. 1 °C equals 274.15 K, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to temperature, measured here against temperature's base unit (°C) — every other temperature unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
K = °C × 274.15
°C = K × -272.15
Worked example: 5 °C × 274.15 = 278.15 K.
Conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| 1 °C | 274.15 K |
| 2 °C | 275.15 K |
| 3 °C | 276.15 K |
| 5 °C | 278.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 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 |
| 1,000 °C | 1,273.15 K |
Frequently asked
- How many Kelvin in a celsius?
- 1 °C equals 274.15 K.
- How do I convert Celsius to Kelvin?
- Multiply the value in °C by 274.15 to get K. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Celsius and Kelvin are both defined by a fixed conversion factor to temperature's base unit (°C), so the result shown is exact to the precision displayed, not an approximation.