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Type any scale
Enter a value in Celsius, Fahrenheit, or Kelvin. The large display and the other fields update instantly.
Temperature converter
Edit any scale — Celsius, Fahrenheit, or Kelvin update together. The glow follows how hot or cold the value is.
Fahrenheit
68°F
Celsius
20°C
Kelvin
293.15K
Conversion formulas (LaTeX)
Where C is degrees Celsius, F is degrees Fahrenheit, and K is kelvin.
Pro Tip
Kelvin has no degrees symbol—it's just '293 K'. Absolute zero is 0 K (−273.15°C), so Kelvin is always positive in everyday use.
How to Use the Temperature Converter
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Watch the glow and thermometer
The card glow shifts blue for cold and red for hot. The side bar fills as temperature rises.
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Check the formulas
Scroll below the tool for LaTeX conversion formulas (Celsius to Fahrenheit and Kelvin).
Temperature scales & formulas
Celsius is tied to water: 0°C is freezing and 100°C is boiling at standard pressure. Fahrenheit sets 32°F at freezing and 212°F at boiling. Kelvin is an absolute scale: 0 K is absolute zero, and one kelvin step is the same size as one Celsius degree.
To convert Celsius to Fahrenheit, use F = C × 9/5 + 32. To get kelvin from Celsius, add 273.15. The tool above applies these relationships automatically; the typeset equations under the converter repeat them for study or documentation.
Frequently Asked Questions
Historical reasons. Fahrenheit was common in English-speaking countries, Celsius in others, and Kelvin for scientific work.
Absolute zero (-273.15°C or -459.67°F) is the lowest possible temperature, where all molecular motion stops.
Kelvin is an absolute scale with no negative values, making calculations and ratios more intuitive in physics and chemistry.