Kelvin to Celsius Converter
Convert kelvin to Celsius — subtract 273.15. The degree size is identical. Results update as you type; exact factors shown.
One kelvin is -272.15 degrees Celsius — see the exact factor, not a rounded rule of thumb.
How the kelvin to celsius converter works
Celsius and Fahrenheit are offset scales, so the conversion is not a simple multiplication: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. Kelvin has the same size of degree as Celsius but starts at absolute zero: K = °C + 273.15. The two scales meet at −40°.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common temperature conversions
| From | To | Units |
|---|---|---|
| 0 K | -273.15 °C | kelvins to degrees Celsius |
| 100 K | -173.15 °C | kelvins to degrees Celsius |
| 200 K | -73.15 °C | kelvins to degrees Celsius |
| 250 K | -23.15 °C | kelvins to degrees Celsius |
| 273.15 K | 0 °C | kelvins to degrees Celsius |
| 293 K | 19.85 °C | kelvins to degrees Celsius |
| 300 K | 26.85 °C | kelvins to degrees Celsius |
| 310 K | 36.85 °C | kelvins to degrees Celsius |
| 373.15 K | 100 °C | kelvins to degrees Celsius |
| 500 K | 226.85 °C | kelvins to degrees Celsius |
| 1,000 K | 726.85 °C | kelvins to degrees Celsius |
| 5,778 K | 5,504.85 °C | kelvins to degrees Celsius |
Units in this converter and their exact factors
| Unit | Symbol | To kelvin |
|---|---|---|
| degree Celsius | °C | x+273.15 |
| degree Fahrenheit | °F | (x-32)×5÷9+273.15 |
| kelvin | K | x |
FAQFrequently asked questions about temperature conversion
What is the formula?
°C = K − 273.15.
What is 300 K?
26.85°C — a warm day.
Why is there no multiplication?
Because a kelvin and a Celsius degree are exactly the same size; only the zero point differs.
What is absolute zero in Celsius?
−273.15°C.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.