Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
About this tool
Temperature is the one everyday measurement where the metric and imperial worlds still refuse to meet. Celsius is used by most of the world and all of science, Fahrenheit dominates daily life in the United States, and Kelvin is the SI base unit used in physics and engineering.
The formulas are simple but easy to misremember: Fahrenheit equals Celsius times 9/5 plus 32, and Kelvin equals Celsius plus 273.15. This converter applies them exactly, in any direction.
Frequently asked questions
What is a quick mental shortcut?
For Celsius to Fahrenheit, double it and add 30. It is within a few degrees across the everyday weather range.
Why does Kelvin have no degree symbol?
Kelvin is an absolute scale starting at absolute zero, and by SI convention its unit is written simply as K.