# Kelvin to Celsius Converter

URL: https://speedycalculator.com/calculators/conversion/kelvin-to-celsius/
Last updated: 2026-10-25

> Convert kelvins to degrees Celsius instantly. Subtract 273.15 from kelvin to get degrees Celsius.

## Inputs

- Kelvins (K)

## Results

- Degrees Celsius

## Formula

```
°C = K − 273.15
```

## Explanation

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

KelvinsDegrees CelsiusDegrees CelsiusKelvins0 K-273.15 °C-273.15 °C0 K77 K-196.15 °C-196 °C77.15 K173.15 K-100 °C0 °C273.15 K233.15 K-40 °C20 °C293.15 K273.15 K0 °C25 °C298.15 K293.15 K20 °C100 °C373.15 K298.15 K25 °C300 K26.85 °C310.15 K37 °C373.15 K100 °C500 K226.85 °C1,000 K726.85 °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”.

## Worked example

Inputs — Kelvins: 300 K.

Results — **Degrees Celsius = 26.85 °C**.

## FAQ

**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.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)