Okay, you write in the very first sentence in your first post that you used the calculator tool, hence my reply.
Either way, definitely file online. Much easier and "safer" than filing on paper. You don't have to worry about your application disappearing in the mail, you don't have to wait to get your acceptance letter (NOA1), you get all of your documents straight in your online account etc. You can also upload documents as you go, the entire time your application is pending, as you gather more evidence each month. The online form is also a lot less confusing than the paper form.