Subtract 273.15 from kelvin to get degrees Celsius. The two scales have the same step size; only the zero point differs.
How to use the Kelvin to Celsius Converter
- Type the number of kelvins into the Kelvins field. Decimals such as 150 are fine.
- Read the answer in Degrees Celsius – it updates as you type, with no button to press.
- To convert the other way, type into Degrees Celsius and the kelvins are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only K ⇄ °C. Need a different unit? Use the general temperature converter, where you can choose any “from” and “to” unit.
How it works
Kelvins and degrees Celsius use different zero points as well as different sized degrees, so this is not a simple multiplication: the calculator applies the formula °C = K − 273.15, which first scales the value and then shifts it by the offset between the two zero points. Going back uses the inverse, K = (°C − -273.15) ÷ 1. Results are calculated at full precision and rounded only for display, so typing into either field gives consistent values.
How to convert kelvins to degrees Celsius
- Start with the value in kelvins: 300 K.
- Apply the formula °C = K − 273.15.
- The result is 26.85 °C.
- To go back, use K = (°C − -273.15) ÷ 1.
K to °C conversion table
| Kelvins | Degrees Celsius | Degrees Celsius | Kelvins |
|---|---|---|---|
| 0 K | -273.15 °C | -273.15 °C | 0 K |
| 77 K | -196.15 °C | -196 °C | 77.15 K |
| 173.15 K | -100 °C | 0 °C | 273.15 K |
| 233.15 K | -40 °C | 20 °C | 293.15 K |
| 273.15 K | 0 °C | 25 °C | 298.15 K |
| 293.15 K | 20 °C | 100 °C | 373.15 K |
| 298.15 K | 25 °C | ||
| 300 K | 26.85 °C | ||
| 310.15 K | 37 °C | ||
| 373.15 K | 100 °C | ||
| 500 K | 226.85 °C | ||
| 1,000 K | 726.85 °C |
What is a kelvin?
The kelvin is the SI unit of temperature. It starts at absolute zero, the coldest possible temperature, and has the same step size as the degree Celsius.
What is a degree Celsius?
The Celsius scale sets 0 °C at the freezing point and 100 °C at the boiling point of water at sea level. Since 2019 it is defined from the kelvin: °C = K − 273.15.
Common mistakes to avoid
Forgetting the offset (°f is not just °c × 1.8), converting temperature differences with the full formula (a change of 10 °c is a change of 18 °f, with no +32), and writing “degrees kelvin”.
Formula
°C = K − 273.15Worked example
Inputs — Kelvins: 300 K.
Results — Degrees Celsius = 26.85 °C.
Frequently asked questions
What is 0 K in Celsius?
−273.15 °C, absolute zero.
What is room temperature in kelvin?
About 293–298 K.
How do I convert kelvins to degrees Celsius?
Use °C = K − 273.15. For example, 300 K = 26.85 °C.
How do I convert degrees Celsius back to kelvins?
Use K = (°C − -273.15) ÷ 1, or type the value into the degrees Celsius field above.
What is 1,000 K in degrees Celsius?
1,000 K = 726.85 °C.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between kelvins and degrees Celsius. To pick any temperature unit, use the general temperature converter linked under Related calculators.
What formula does the Kelvin to Celsius Converter use?
°C = K − 273.15.