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Celsius (C) → Kelvin (K)

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Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

273.1°
C°=K°
0=273.15
5=278.15
10=283.15
15=288.15
20=293.15
25=298.15
30=303.15
37=310.15
50=323.15
100=373.15

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Brief explanation: Celsius to Kelvin

Celsius (C) is used globally for weather and daily life. Fahrenheit (F) is common in the USA. Kelvin (K) is used in science. Water boils at 100°C/212°F and freezes at 0°C/32°F. Normal body temperature is about 37°C or 98.6°F. To convert Celsius to Fahrenheit: multiply by 9/5 and add 32. To convert Fahrenheit to Celsius: subtract 32 and multiply by 5/9.

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Common conversion examples: Celsius to Kelvin

Reference values for quick comparison. Use the converter above for any amount.

  • 0 Celsius=273.15 Kelvin
  • 25 Celsius=298.15 Kelvin
  • 100 Celsius=373.15 Kelvin

About the Units

Celsius (C)

Definition: Celsius (°C) is a temperature scale where water freezes at 0°C and boils at 100°C at standard atmospheric pressure. It is the standard temperature unit in the metric system and most of the world.
History: The Celsius scale was developed by Anders Celsius in 1742. It was originally reversed (0 for boiling, 100 for freezing) until Jean-Pierre Christin inverted it. It is also called centigrade.
Current use: Celsius is used for weather, cooking, and science worldwide. Oven temperatures, body temperature, and climate data use Celsius. The US is the main holdout, using Fahrenheit for weather.

Kelvin (K)

Definition: Kelvin (K) is the base unit of temperature in the SI system. Zero Kelvin (absolute zero) is the lowest possible temperature. The Kelvin scale has the same increment as Celsius but starts at absolute zero.
History: Lord Kelvin proposed the scale in 1848. It is based on absolute zero, the point at which molecular motion ceases. The kelvin was redefined in 2019 using the Boltzmann constant.
Current use: Kelvin is used in physics, chemistry, and astronomy. Scientific research and thermodynamic calculations use Kelvin. It is not used for everyday weather—Celsius or Fahrenheit are used instead.

Sources

Conversion factors and unit definitions follow international standards. For authoritative references, see: