This kelvin to degrees Celsius converter turns any K reading into °C instantly, in your browser, with the formula shown so you can check the result by hand. Kelvin are an SI unit used in science and engineering; degrees Celsius are part of the metric system used in most countries. Water freezes at 273.15 K (0 °C) and boils at 373.15 K (100 °C) at sea level.
The formula is °C = K − 273.15. For a quick mental estimate between Celsius and Fahrenheit, double the Celsius value and add 30; it is within a few degrees for everyday temperatures. Normal body temperature is 310.15 K, which is 37 °C.
K to °C formula
°C = K − 273.15
Kelvin to Degrees Celsius conversion table
| kelvin | degrees Celsius | Rounded |
|---|---|---|
| 0 K | -273.15 °C | -273 |
| 100 K | -173.15 °C | -173 |
| 200 K | -73.15 °C | -73.1 |
| 250 K | -23.15 °C | -23.1 |
| 273.15 K | 0 °C | 0 |
| 293.15 K | 20 °C | 20 |
| 300 K | 26.85 °C | 26.9 |
| 310.15 K | 37 °C | 37 |
| 350 K | 76.85 °C | 76.9 |
| 373.15 K | 100 °C | 1 |
| 400 K | 126.85 °C | 127 |
| 500 K | 226.85 °C | 227 |
Frequently asked questions
How many degrees Celsius are in 20 kelvin?
20 K = -253.15 °C. Apply the formula °C = K − 273.15. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert kelvin to degrees Celsius?
°C = K − 273.15. Temperature scales have different zero points, so you cannot simply multiply; the offset matters. Worked example: 100 K = -173.15 °C.
Is -10 K the same as -283.15 °C?
Yes. -10 K = -283.15 °C, a common winter temperature. Notice that -40 is the one point where Celsius and Fahrenheit agree: -40 °C equals -40 °F.
How do I convert degrees Celsius back to kelvin?
Reverse the formula: K = °C + 273.15. Or use the degrees Celsius to kelvin page linked above, which has its own table and examples.