Celsius ↔ Kelvin Converter (°C to K)
Convert between Celsius and Kelvin temperature scales with precision and advanced features
| Amount | Kelvin |
|---|---|
| -273.15 °C | 0 K |
| -200 °C | 73.15 K |
| -100 °C | 173.15 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| 1,000 °C | 1,273.15 K |
More Temperature Unit Converters
Explore more temperature conversions between Celsius, Fahrenheit and Kelvin for fast, accurate results every time.
Celsius to Kelvin Converter: °C to K and K to °C
This Celsius to Kelvin converter is a two-way online tool that changes temperatures between Celsius (°C) and Kelvin (K) instantly and accurately. It is built for students, teachers, scientists, engineers and anyone working with scientific or absolute temperature values. It updates as you type or move the slider, shows reference temperatures, and gives the exact formula, so there is no manual calculation to get wrong.
Quick answer: 0 °C is 273.15 K, 25 °C is 298.15 K, 100 °C is 373.15 K, and absolute zero is 0 K, or −273.15 °C. To convert any temperature, add 273.15 to the Celsius value.
About Celsius to Kelvin Conversion
Celsius to Kelvin conversion translates a temperature from the scale used in daily life and weather reports into the absolute scale used in science and engineering. Kelvin is essential in thermodynamics, physics and chemistry because it starts at absolute zero and has no negative values. Gas laws, for instance, only work when temperature is in Kelvin.
What Is Celsius?
Celsius is a temperature scale where water freezes at 0 °C and boils at 100 °C under standard atmospheric pressure. It is widely used around the world for weather forecasts, daily temperature measurement, education and general purposes.
What Is Kelvin?
Kelvin is the absolute thermodynamic temperature scale used in scientific research. It begins at absolute zero (0 K), the lowest possible temperature, where molecular motion theoretically stops. Kelvin does not use the degree symbol and is written simply as K. One kelvin is the same size as one degree Celsius, so only the starting point differs.
Celsius to Kelvin Formula
To convert Celsius to Kelvin, add 273.15:
Example: if the temperature is 25 °C, then K = 25 + 273.15 = 298.15 K.
Kelvin to Celsius Formula
To convert Kelvin to Celsius, subtract 273.15:
Example: if the temperature is 300 K, then °C = 300 − 273.15 = 26.85 °C.
Celsius to Kelvin Chart
These values use the exact offset, so they match the converter above:
| Celsius | Kelvin |
|---|---|
| -273.15 °C | 0 K |
| -196 °C | 77.15 K |
| -78.5 °C | 194.65 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 100 °C | 373.15 K |
| 1000 °C | 1,273.15 K |
| Kelvin | Celsius |
|---|---|
| 0 K | -273.15 °C |
| 77 K | -196.15 °C |
| 100 K | -173.15 °C |
| 200 K | -73.15 °C |
| 273.15 K | 0 °C |
| 293.15 K | 20 °C |
| 300 K | 26.85 °C |
| 373.15 K | 100 °C |
If you also need Fahrenheit, the Celsius to Fahrenheit converter handles that scale, and the full temperature converter covers all three.
Who Uses This Converter?
Students and teachers use it in physics and chemistry lessons, and scientists and researchers use it for experiments and lab work. Engineers and technicians use it for specifications, and laboratory professionals use it when instruments report in Kelvin. It is also useful for anyone working with absolute temperature values.
What Is This Converter Used For?
People use it for scientific and thermodynamic calculations, physics and chemistry experiments, and engineering and industrial applications. It also helps with educational and academic learning, with understanding absolute zero and energy states, and with standardizing temperature measurements. For other units, see the length converter, the weight converter or the unit converter, which brings every category together.
How to Use the Celsius to Kelvin Converter
Choose the scale
Select Celsius or Kelvin as the input unit, or press the swap button to reverse the direction.
Enter the temperature
Type a value, move the slider, or tap a quick card such as absolute zero or water boiling.
Read the result
The converted temperature appears instantly. Press the convert button if you prefer to confirm it.
Explore the extras
Open Temperature Difference, Formula, Reference or Comparison to see the gap between two readings, the equation or everyday temperatures.