The way I would estimate was this: The one mile Dvd took about 20 minutes, so that's 3 mph. The 3 mile express DVD (that I used pretty often) took about 45 minutes - so 4 MPH. The 5 mile DVD takes about 70 minutes, so 5 MPH. What I'm saying is that I took the total length of the walk and divided it 60 minutes to get the MPH. Does that make sense. It's all just an estimate anyway, so I'm not too worried about estimating incorrectly.