Kelvin to Celsius (K to °C) Converter
To convert Kelvin to Celsius, subtract 273.15: °C = K − 273.15. For example, 300 K equals 26.85 °C. The two scales rise in equal-sized degrees but start from different zero points, so the conversion is a simple offset rather than a multiplication.
The formula
Subtract the offset 273.15 from the Kelvin value:
°C = K − 273.15
For example, 310.15 K − 273.15 = 37 °C, normal human body temperature. A Kelvin degree and a Celsius degree are exactly the same size, which is why only the offset changes.
Conversion table
| Kelvin (K) | Celsius (°C) |
|---|---|
| 0 | -273.15 |
| 100 | -173.15 |
| 200 | -73.15 |
| 273.15 | 0 |
| 293.15 | 20 |
| 300 | 26.85 |
| 310.15 | 37 |
| 373.15 | 100 |
| 500 | 226.85 |
| 1000 | 726.85 |
How to convert online
- Type the Kelvin temperature into the first box.
- Read the Celsius result instantly in the second box.
- Or enter a Celsius value to convert back to Kelvin — it works both ways.
Use the Kelvin to Celsius Converter — free and instant in your browser.
Where this conversion is used
Kelvin is the SI unit of temperature used throughout physics, chemistry and astronomy, while everyday weather, cooking and lab reporting in most of the world use Celsius. Converting K to °C is common when you interpret scientific data, calibrate instruments, or make a thermodynamics result readable to a general audience.
FAQ
What is the formula to convert Kelvin to Celsius?
°C = K − 273.15. Just subtract 273.15 from the Kelvin value.
What is 0 K in Celsius?
Zero Kelvin (absolute zero) equals -273.15 °C, the coldest possible temperature.
How do I convert Celsius back to Kelvin?
Add 273.15: K = °C + 273.15. For example, 20 °C = 293.15 K.
Is the conversion exact?
Yes. The offset is exactly 273.15, so there is no rounding.
Related converters
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Recommended reading
Kelvin to Fahrenheit (K to °F) Converter
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