Simplified US Postage Finder

I should probably be working on my exhibition for London, but procrastination duties call and I solved a simple problem I've had for quite a while. I always am unsure of the postage rates for sending a letter inside the US, as well as outside the US. The stamps I have in my desk seem to always be a few versions back so I always need to tack on the little 2-cent and 3-cent upgrades in a sort of random fashion. When I try to get down to business and figure out the real rates, I go online to the USPS Postage Calculator and stress out with all the options. So I simplified the process a bit with a little hack. My sincere apologies that this is only useful for folks that live in the States.