Target Simple Javascript to a Single Page/Post

Hi:

I know how to target CSS inserts to specific pages or posts, but would like to be able to add a Javascript custom calculator (body-only code) to a single page and I am not sure how to do that. I know where in HTML inserts to put body-only script code, but not how to target the code to a specific page. Can this be done?

Or is there another way? I thought about having it in a widget and covering that one page with a sidebar, but I don't know how to target a sidebar to just one page, either.

Thanks in advance for any help.

Leha