I want a PDF to be writable. Like a table as excel i want to put in numbers in rows and at the last row i want it to count the amount automatic. Is that possible?
Of course. You just need to set up all the form fields and the calculation
settings for the ones that should display the results you want.
But i gues i have to use acrobat pro for this?!
But what about the 50 users who is suppose to edit this pdf and write in numbers, save it and ship it by mail. Do they also need to have acrobat pro?
You don't need Acrobat Pro, any version of Acrobat will do.
The users can use Reader, but you'll have to enable the right for them to
save the filled-in file using Acrobat.