A couple of questions came up from different people and I thought I'd respond here in case anyone else might be wondering. First, not to confuse age of universe with Hubble time. Just coincidence that they are near. When you look at Jorrie's calculator (Lightcone link in my sig) you see we are in year 13.8 billion of the expansion and the Hubble time (a reciprocal measure of expansion rate) is 14.4 billion years. they are different. Secondly, suppose you do one over 14.4 billion years. You get 0.069444 per billion years Now you want to convert to the older clunkier traditional units: "km/s per Mpc" So to do the conversion you paste this into google window (without the quotes) and press return: "0.069444 per billion years in (km/s per Mpc)" See what you get. It works for me, if it doesn't work for you please let us know.