how to se form calculation widget

Hi,

It appears as though the rest of your question may not have come through completely.  In any case here is a link to our form calculation widget:

http://widgets.jotform.com/widget/calculation

The widgets calculation can be accessed by clicking on the calculation field, then clicking on magic wand icon:

If you are looking for something else, please let us know a bit more detail and we will be happy to help.