Kelvin to Celsius Converter

Convert Kelvin (K) to Celsius (°C) instantly and accurately.

Convert Kelvin to Celsius instantly with this free online tool. Type a temperature in Kelvin and see the Celsius value right away, or type Celsius to convert back. Everything runs in your browser — no sign-up and no waiting.

How to convert Kelvin to Celsius

To convert Kelvin to Celsius, subtract 273.15. Because the two scales share the same degree size, the only difference is where the scale starts. For example, 273.15 K = 0 °C and 300 K ≈ 26.85 °C. This converter does the math for you and updates as you type.

  1. Enter the temperature in Kelvin in the first field.
  2. Read the result in Celsius in the second field.
  3. Type into the Celsius field to convert in the other direction.

Why use this Kelvin to Celsius converter?

  • 100% free with no ads, sign-up, or limits.
  • Instant, two-way conversion as you type.
  • Uses the exact offset of 273.15.
  • Runs entirely in your browser.

Frequently asked questions

What is the formula to convert Kelvin to Celsius?

Celsius = Kelvin − 273.15.

What is 300 K in Celsius?

300 K equals about 26.85 °C, a comfortable room temperature.

What is absolute zero in Celsius?

Absolute zero is 0 K, which equals −273.15 °C.