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Kelvin to Celsius Converter

Convert kelvin to celsius online. 100 K = -173.15 °C. Free, instant Kelvin-to-Celsius converter. Works both ways with a formula and reference table.

Kelvin → Celsius

1 K = -272.15 °C

Kelvin to Celsius conversion table

Kelvin (K)Celsius (°C)
1 K-272.15 °C
2 K-271.15 °C
5 K-268.15 °C
10 K-263.15 °C
25 K-248.15 °C
50 K-223.15 °C
100 K-173.15 °C
  • Instant, live Kelvin ↔ Celsius conversion
  • Accurate to the exact formula
  • Converts in both directions
  • Reference table of common values
  • 100% private — runs entirely in your browser
  • Free, no sign-up, works offline

How to use the Kelvin to Celsius Converter

  1. 1

    Type the number of kelvin in the first box.

  2. 2

    Read the equivalent value in celsius instantly in the second box.

  3. 3

    Or type a Celsius value to convert back to kelvin — it works both ways.

  4. 4

    Copy the result, or check the reference table for common conversions.

About the Kelvin to Celsius Converter

The ByteTools Kelvin to Celsius Converter turns any Kelvin temperature into Celsius instantly using the standard conversion formula, °C = K − 273.15. Type a value and the result updates live, with the formula and a quick reference table shown below.

Temperature conversions are essential for weather, cooking, science and travel between countries that use Celsius and Fahrenheit. Everything is calculated locally in your browser — nothing is uploaded — so it is fast, private and works offline. Enter a number in either box to convert both ways, and use the table for common Kelvin-to-Celsius values at a glance.

Frequently asked questions

What is the formula to convert Kelvin to Celsius?

Use °C = K − 273.15. Enter any Kelvin value and this tool applies the formula instantly. For example, 100 K equals -173.15 °C.

What is 0 K in Celsius?

Zero K equals -273.15 °C. Temperature scales have different zero points, so the conversion is an offset formula rather than a simple multiplication.

How do I convert Celsius back to Kelvin?

Apply the inverse formula, or simply use our Celsius to Kelvin converter for the reverse direction. Both pages share the same exact conversion so the numbers always match.

Is this Kelvin to Celsius converter free and private?

Yes. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, logged or stored. It is completely free, needs no sign-up and keeps working offline once loaded.

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