Convert between different temperature scales including Celsius, Fahrenheit, Kelvin, and Rankine with precise formulas and instant results.
Absolute zero (-273.15°C or -459.67°F) is the lowest possible temperature where all molecular motion ceases. It's the zero point of the Kelvin and Rankine scales.
The Fahrenheit scale was proposed by Daniel Gabriel Fahrenheit in 1724. He originally defined 0°F as the temperature of a mixture of ice, water, and ammonium chloride, and 96°F as the human body temperature.
Celsius and Fahrenheit scales intersect at -40 degrees. This means -40°C equals -40°F, the only point where these two scales share the same numerical value.
Most countries use Celsius for everyday temperature measurements. The United States is one of the few countries that still predominantly uses Fahrenheit for weather forecasts and body temperature.