The theories, however, are not even in the same ballpark.
If you are unsure of any of the information, the calculator may be able to provide an estimate or you may want to enter a ballpark figure in order to obtain an idea of what you will pay every month for your mortgage.
Instead of skipping a night at the ballpark, try a minor league game.
Expect to pay somewhere in that ballpark when you shop anywhere else.
Since it is difficult to determine an exact value for an item, the evaluation will usually be given in a ballpark type figure.