Temperature Converter
Available Conversions
About Temperature Units
Temperature measures the average kinetic energy of particles within a substance, indicating how hot or cold something is. It plays a critical role in virtually every scientific discipline, from physics and chemistry to biology and environmental science. Different scales — Celsius, Fahrenheit, and Kelvin — serve various practical and scientific needs worldwide.
Celsius
Developed by Swedish astronomer Anders Celsius in 1742, the Celsius scale sets water's freezing point at 0° and boiling point at 100° at standard atmospheric pressure. It is the most widely used temperature scale in science and everyday life worldwide.
Fahrenheit
Daniel Gabriel Fahrenheit introduced his temperature scale in 1724, basing it on a mixture of ice, water, and salt as 0° and average human body temperature near 96°. The Fahrenheit scale remains common in the United States and a few other regions for weather and cooking.
Kelvin
The Kelvin scale, named for Lord Kelvin, is the SI base unit for thermodynamic temperature. Anchored at absolute zero, it is essential for scientific calculations that require an absolute temperature reference.