🌡️ Temperature Converter

Kelvin to Celsius
( K → °C )

Instantly convert Kelvin to Celsius. Enter any value below and get an accurate result with the full formula and reference table.

Converter Tool
K
°C
Result
273.15 K = 0°C
0
°C
The Formula
°C = K – 273.15
Subtract 273.15 from the Kelvin temperature.

How to Convert Kelvin to Celsius

To convert Kelvin to Celsius, simply subtract 273.15 from the Kelvin temperature. This is because the Celsius scale is offset from absolute zero by 273.15 degrees.

Step-by-Step Example

Let’s convert 300 K to Celsius:

1. Subtract 273.15: 300 – 273.15 = 26.85
2. So 300 K equals 26.85°C.

Another common example: 373.15 K (boiling point of water) → 373.15 – 273.15 = 100°C.

Note on Absolute Zero

The Kelvin scale starts at absolute zero (0 K), which is the lowest possible temperature. In Celsius, absolute zero is -273.15°C.

When You’d Use Each Unit

Kelvin is the SI unit for temperature and is used in science, particularly in physics, chemistry, and engineering. Celsius is used worldwide for everyday temperature measurements. Converting between them is essential for scientific work and understanding.

Conversion Table

Common Kelvin values converted to Celsius — typical values highlighted.

Kelvin (K) Celsius (°C) Approximate
Frequently Asked Questions
How do I convert Kelvin to Celsius quickly? +
Subtract 273. For most everyday temperatures, subtracting 273 gives a good approximation. Exact formula: °C = K – 273.15.
What is 0 K in Celsius? +
0 K = -273.15°C (absolute zero).
What is 273.15 K in Celsius? +
273.15 K = 0°C.
What is 373.15 K in Celsius? +
373.15 K = 100°C.
What is room temperature in Kelvin? +
Room temperature (20°C) is about 293.15 K.
Can I convert Celsius back to Kelvin with this tool? +
Yes! Just type a value into the Celsius field and the Kelvin field updates automatically. Or use the ⇄ swap button to switch directions.
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