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Kelvin to Celsius Converter

Convert between Kelvin, Celsius, and Fahrenheit temperature scales

Input Temperature

Enter temperature and select units

Absolute Temperature
273.15 K

Quick Conversions

Common Temperatures

Absolute Zero
-273.15°C / -459.67°F
Water Freezes
0°C / 32°F
Room Temperature
20°C / 68°F
Body Temperature
37°C / 98.6°F
Water Boils
100°C / 212°F

Conversion Result

273.15 K =
0
Celsius

All Conversions

273.15 K equals:

Kelvin273.15 K
Celsius0 °C
Fahrenheit32 °F

Scientific Temperatures

Click to convert scientific reference points

Liquid Nitrogen77K / -196.15°C
Dry Ice Sublimes194.65K / -78.5°C
Mercury Freezes234.32K / -38.83°C
Water Triple Point273.16K / 0.01°C
Human Body310.15K / 37°C
Surface of Sun5778K / 5,504.85°C

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About Kelvin Temperature Scale

What is Kelvin?

Kelvin (K) is the base unit of temperature in the International System of Units (SI). It is an absolute temperature scale, meaning it starts at absolute zero (0K), the theoretical point where all molecular motion stops. Unlike Celsius and Fahrenheit, Kelvin has no negative values.

Conversion Formulas

Kelvin to Celsius:
°C = K - 273.15
Celsius to Kelvin:
K = °C + 273.15
Kelvin to Fahrenheit:
°F = (K - 273.15) × 9/5 + 32

Key Reference Points

Absolute Zero:
0K = -273.15°C = -459.67°F
Lowest possible temperature
Water Points:
Freezes: 273.15K (0°C)
Boils: 373.15K (100°C)

Why Use Kelvin?

  • Required for thermodynamic calculations and gas laws
  • No negative values - simplifies mathematical operations
  • Standard in physics, chemistry, and engineering
  • Used in astronomy to measure stellar temperatures
  • Essential for cryogenics and low-temperature physics

Common Applications

  • Scientific research and laboratory work
  • Thermodynamic calculations (PV=nRT)
  • Color temperature in photography and lighting
  • Astronomy and astrophysics
  • Cryogenics and superconductivity
  • Material science and metallurgy

Why 273.15?

The Kelvin scale is offset from Celsius by exactly 273.15 degrees. This value was chosen so that the triple point of water (where ice, liquid water, and water vapor coexist) occurs at exactly 273.16K. The size of one Kelvin is identical to one degree Celsius, making conversions simple.