InterCalc has two tab views. The first tab shows conversions that have been configured and the second tab is used to configure new conversions.
To add a new conversion click on the Setup - two gears tab, and click the "+" sign in the upper right. This will bring up a view to create a new conversion.
The first 3 lines simply deal with the description of the conversion: Title, Convert (from) and (convert) To. The fourth line is used to specify the number of digits to the right of the decimal in the result. The "Recents" line is used to specify how many recent values (or previous values) to retain in a list.
In the two columns in the next section the X and Y values are entered to describe the relationship.
Linear conversions are simple such converting Celcius to Fahrenheit or kph to mph, or kg to pounds - even currency conversion.
Simply enter two points on the line and you are done. For example to convert C to F, simply enter two corresponding points, such as the freezing and boiling points.