Kelvin to Celsius
Kelvin is the SI base unit of temperature, starting at absolute zero, used throughout science and astronomy. 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. 1 K equals -272.15 °C, 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
°C = K × -272.15
K = °C × 274.15
Worked example: 5 K × -272.15 = -268.15 °C.
Conversion table
| Kelvin (K) | Celsius (°C) |
|---|---|
| 1 K | -272.15 °C |
| 2 K | -271.15 °C |
| 3 K | -270.15 °C |
| 5 K | -268.15 °C |
| 10 K | -263.15 °C |
| 20 K | -253.15 °C |
| 25 K | -248.15 °C |
| 50 K | -223.15 °C |
| 100 K | -173.15 °C |
| 250 K | -23.15 °C |
| 500 K | 226.85 °C |
| 1,000 K | 726.85 °C |
Frequently asked
- How many Celsius in a kelvin?
- 1 K equals -272.15 °C.
- How do I convert Kelvin to Celsius?
- Multiply the value in K by -272.15 to get °C. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Kelvin and Celsius 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.