The TMS, based on the theoretical work of Murray N. Rothbard, gives us the best possible look at the speed of the Federal Reserve’s counterfeiting press. The Mises Institute maintains it here. And here is more on the theoretical basis, from Joseph Salerno, who helped develop it.

Of interest to admirers of Ron Paul: this monetary measure came about due to Murray’s and Joe’s membership in Ron’s Shadow Open Market Committee, a private group he set up in the 1980s (and named after the pro-Fed committee of the Monetarists) to keep an eye on the depradations of the central bank. The committee, on which I served as well, met at the Mises Institute.