Kelvins to Degrees Celsius (K to °C) Converter
To convert kelvin to Celsius, use °C = K − 273.15. For example, 20 K = -253.15 °C.
Quick facts
- Formula: °C = K − 273.15
- Water freezes at 0 °C and boils at 100 °C (at sea level).
- Normal body temperature is about 37 °C.
- −40 is the same in Celsius and Fahrenheit.
How to convert kelvins to degrees Celsius
Temperature scales have different zero points, so you cannot just multiply: you need the offset as well as the multiplier.
Worked example: 25 K = -248.15 °C.
Source: BIPM, The International System of Units (SI Brochure, 9th edition, 2019), for the kelvin and degree Celsius.
Kelvins to Degrees Celsius conversion table
| Kelvins [K] | Degrees Celsius [°C] |
|---|---|
| -40 K | -313.15 °C |
| -20 K | -293.15 °C |
| -10 K | -283.15 °C |
| 0 K | -273.15 °C |
| 10 K | -263.15 °C |
| 20 K | -253.15 °C |
| 25 K | -248.15 °C |
| 30 K | -243.15 °C |
| 37 K | -236.15 °C |
| 40 K | -233.15 °C |
| 50 K | -223.15 °C |
| 100 K | -173.15 °C |
Kelvins vs Degrees Celsius
| Kelvin | Celsius | |
|---|---|---|
| Symbol | K | °C |
What is a kelvin?
The SI base unit of temperature, starting at absolute zero with no negative values. Used in physics, chemistry, and engineering wherever an absolute scale is required.
What is a Celsius?
A scale where water freezes at 0° and boils at 100° at standard atmospheric pressure. The standard temperature scale for weather, cooking, and science in most of the world.
Frequently asked questions
What is the formula to convert kelvin to Celsius?
°C = K − 273.15. This conversion needs an offset as well as a multiplier because the scales have different zero points.
What is 0 K in °C?
0 K = -273.15 °C.
What is 100 K in degrees Celsius?
100 K = -173.15 °C.
What is 37 K in °C?
37 K = -236.15 °C.
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