0°C = 273.15 K

0 degrees Celsius equals 273.15 K

Conversion Results

Scale Temperature
Celsius 0.00°C
Fahrenheit 32.00°F
Kelvin 273.15 K

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The temperature converter is an essential tool for converting between the three major temperature scales: Celsius, Fahrenheit, and Kelvin. Whether you're traveling internationally, following a recipe from another country, studying science, or working in a field that requires temperature conversions, this calculator provides instant, accurate results. Simply enter a temperature value, select the source and target units, and get your conversion immediately along with reference values in all three scales.

About Temperature Scales

Celsius (°C) is used worldwide for everyday temperature measurement. Fahrenheit (°F) is primarily used in the United States. Kelvin (K) is the SI unit used in scientific applications, where 0 K represents absolute zero - the coldest possible temperature.

Conversion Formulas
  • °C to °F: (°C × 9/5) + 32
  • °F to °C: (°F - 32) × 5/9
  • °C to K: °C + 273.15
  • K to °C: K - 273.15

Common Reference Points

  • Absolute Zero: -273.15°C / -459.67°F / 0 K
  • Water Freezing Point: 0°C / 32°F / 273.15 K
  • Normal Body Temperature: 37°C / 98.6°F / 310.15 K
  • Water Boiling Point: 100°C / 212°F / 373.15 K
Popular Calculations
100°C to °F (Boiling Water) 32°F to °C (Freezing Point) 0°C to K (Freezing in Kelvin) 98.6°F to °C (Body Temperature) 273.15 K to °C (Zero Celsius) 212°F to °C (Boiling Point) 37°C to °F (Body Temperature) 0 K to °C (Absolute Zero)
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Mathematical Explanation

Temperature conversions use linear relationships between scales. Celsius to Fahrenheit: multiply by 9/5 and add 32. Fahrenheit to Celsius: subtract 32 and multiply by 5/9. Celsius to Kelvin: add 273.15. Kelvin to Celsius: subtract 273.15. These formulas reflect the historical development of each scale: Celsius uses water's freezing (0°C) and boiling (100°C) points, Fahrenheit used brine's freezing point and human body temperature, and Kelvin starts at absolute zero.

Frequently Asked Questions

To convert Celsius to Fahrenheit, multiply the temperature by 9/5 (or 1.8) and add 32. Formula: °F = (°C × 9/5) + 32. For example, 20°C = (20 × 1.8) + 32 = 68°F.

The temperature -40° is the same in both Celsius and Fahrenheit. This is the unique point where both scales intersect: -40°C = -40°F.

Absolute zero is the lowest possible temperature where all molecular motion stops. It equals -273.15°C, -459.67°F, or 0 K (Kelvin). It's theoretically impossible to reach this temperature.

The US uses Fahrenheit due to historical reasons. It was the standard when the country was founded. While most countries switched to Celsius as part of metric system adoption, the US retained Fahrenheit for everyday use, though Celsius is used in scientific contexts.

Kelvin is the SI unit for temperature used primarily in science. It starts at absolute zero, making it useful for physics calculations where negative temperatures would be problematic. It's used in thermodynamics, astronomy, and when measuring color temperature of light.

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