"You could buy that for a nickel when I was a kid." It's a familiar saying from grandparents and other older relatives who like to reminisce about how cheap everything was when they were younger. We all know that inflation drives up prices over time, but do you know how much? Use this consumer price index calculator to find out. To compare prices anytime between 1913 and 2009, simply type in a dollar amount and the years you wish you compare. For more price comparisons, see Current Value of Old Money, a site maintained by a science librarian.