Farenheit Celcius is a free and very easy-to-use app that allows you to convert from Celsius to Fahrenheit and vice-versa. It has a built-in database of the most popular values, and it's very quick and accurate.

It also includes a chart that lets you view the change in temperature for any value of the conversion. You can also use it to convert from other units to Celsius and Fahrenheit.

It's very easy to use, and you can do all the calculations by hand.

This app can also be used to convert from other units to Fahrenheit, and vice-versa.

The values for the most popular units are included in the database.