This short video tells you about the Afghanistan war calculator, and then you go here to calculate the economic damage the longest war in American history is doing to you. I like the IOU offered by the site, along with the calculations.
I wonder about the accuracy of these numbers because the United States is massively in debt–we are funding much of what we spend by borrowing. To the extent that we aren’t actually paying for the war now, however, it makes matters much worse. It’s such a strange thing for all of those “family values” politicians to be crushing the next couple of generations with debt.