You can use the FormCalc scripting language to quickly add basic calculations to a form. Adding basic calculations to a form enhances the form-filling experience by eliminating the need for users to manually calculate values by hand, and helps to reduce data entry errors.
This video clip shows you how to add an arithmetic funtion to an object to perform a basic calculation. Thanks again to Lauren McGuire-Wood, our summer intern, for creating it!
To learn more about using FormCalc, go to the LiveCycle Designer ES Help and search for FormCalc.

This is really not very useful because you cannot pause or rewind.
Thanks – I found this simple tutorial informative and its good know someone has a lower bowling average than me, or were those golf scores?Thanks
Thanks for your feedback Ken and Pat, we appreciate your time and effort. We also would like to apologize for any inconvenience the lack of Pause and Rewind buttons may have caused. We will be sure to include them in subsequent videos.
I’m trying to calculate time difference in a form, e.g., cacluating the amount of time that goes by between 1:15 in the morning and 1:45 in the afternoon. I’ve made several attempts with scripting in a field “time total”, without much success.