Custom Formulas (free)

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This powerful app lets you create your own custom formula and then perform computations using it by prompting you for the input values.

Note that this free version is limited to storing only one formula group. An example formula is pre-installed. Simply delete this to add your own formula. Upgrade to the paid version to remove these limitations and to remove the ads.

This app is easy to use, but unlike simpler apps, multiple entered values can be fed into multiple formulas and multiple output values can be displayed. The output of one formula in a group can be fed into the next by using the same variable name.

The order of variables displayed to the user can be changed, as can the number of decimal digits of precision shown in the output fields.

A formula group can be exported or emailed, allowing you to share your creations with other users of the app.

A useful calculator tool is also included.