Convert Kelvin to Celsius
Use this free converter to change kelvin (K) into celsius (°C). Kelvin and celsius both measure temperature. As a quick reference, 1 K equals -272.15 °C, and 1 °C equals 274.15 K.
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Celsius (°C)
-272.15
1 K = -272.15 °C
Temperature conversion table
| Kelvin | Celsius |
|---|---|
| 0.01 | -273.14 |
| 0.1 | -273.05 |
| 0.5 | -272.65 |
| 1 | -272.15 |
| 2 | -271.15 |
| 3 | -270.15 |
| 5 | -268.15 |
| 10 | -263.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 50 | -223.15 |
| 100 | -173.15 |
| 1,000 | 726.85 |
How to convert Kelvin to Celsius
°C = K − 273.15
- Enter the number of kelvin you want to convert.
- The converter instantly shows the equivalent value in celsius.
- For example, 25 K = -248.15 °C using the formula above.
- Use the swap button to reverse the conversion (celsius to kelvin).
About these units
Kelvin (K)
- Definition
- The kelvin (K) is the SI base unit of temperature, starting at absolute zero with the same degree size as Celsius.
- History
- Proposed by William Thomson (Lord Kelvin) in 1848 and redefined in 2019 by fixing the Boltzmann constant.
- Current use
- Kelvin is used throughout science and engineering, especially in physics, chemistry, and astronomy.
Celsius (°C)
- Definition
- The degree Celsius (°C) is a metric temperature unit where water freezes at 0° and boils at 100° at standard pressure.
- History
- Proposed by Swedish astronomer Anders Celsius in 1742 (originally inverted), the scale was later flipped to its modern form.
- Current use
- Celsius is the everyday temperature scale across most of the world for weather, cooking, and medicine.
Frequently asked questions
How many celsius are in a kelvin?
There are -272.15 °C in 1 K. To convert, apply the temperature formula shown above.
How do I convert kelvin to celsius?
°C = K − 273.15 For example, 10 K = -263.15 °C.
Is this kelvin-to-celsius converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Kelvin to other temperature units
| Unit | 1 Kelvin equals |
|---|---|
| Celsius (°C) | -272.15 °C |
| Fahrenheit (°F) | -457.87 °F |
| Rankine (°R) | 1.8 °R |