About the temperature converter
The US mainly uses Fahrenheit, most of the world uses Celsius, and science uses Kelvin. Enter a temperature and its scale to see all three.
How to use this calculator
- Enter the temperature.
- Choose its scale.
- Read all three values.
Worked examples
- (72 − 32) × 5/9 = 22.22 °C
- 22.22 + 273.15 = 295.37 K
22.22 °C, 295.37 K.
Measurement guidance
Quick estimate
To estimate °F from °C, double it and add 30. It’s close for everyday weather.
Frequently asked questions
Where do Celsius and Fahrenheit match?
At −40°.
Does Kelvin use a degree sign?
No. It’s written as K.