Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur scales. Get instant, accurate results with our comprehensive temperature conversion tool.
The most widely used temperature scale worldwide. Water freezes at 0°C and boils at 100°C at standard atmospheric pressure.
Commonly used in the United States. Water freezes at 32°F and boils at 212°F at standard atmospheric pressure.
The absolute temperature scale used in scientific applications. 0K represents absolute zero, the theoretical point where all molecular motion stops.
An absolute temperature scale that uses Fahrenheit-sized degrees. Primarily used in engineering applications in the United States.
A historical temperature scale where water freezes at 0°Ré and boils at 80°Ré. Rarely used today but still found in some European contexts.
Celsius is based on the freezing (0°C) and boiling (100°C) points of water, making it intuitive for everyday use. Fahrenheit uses 32°F for water's freezing point and 212°F for boiling, providing more precise measurements for weather temperatures.
Kelvin is the absolute temperature scale used in scientific calculations, especially in physics and chemistry. It starts at absolute zero (0K = -273.15°C), where all molecular motion theoretically stops.
This is the unique point where the Celsius and Fahrenheit scales intersect. At -40 degrees, both scales show the same numerical value, making it a memorable reference point for temperature conversion.
Absolute zero is the theoretical temperature at which all molecular motion stops. It equals -273.15°C, -459.67°F, or 0K. While impossible to reach in practice, it serves as the starting point for absolute temperature scales like Kelvin.