Uh, not exactly. You can put a mark exactly where the cut needs to be made (at least to visible accuracy) and then align the blade to the mark. Trying to measure from the blade on anything handheld or where the blade moves (chop saw, horizontal bandsaw, etc.) you cannot accurately measure off the blade anyway. About the only thing you can measure from blade is where the blade is fixed and you measure to a fence. At best, saw cuts aren't going to get beyond say 1/32nd of an inch accuracy anyway. If you need more accurate than that, you're doing a rough cut and then setting it up on the milling machine or lathe or whatever.
How many guys here are cutting mild steel with a skill saw? And even with a metal cutting skill saw you would normally set up some kind of fence...and you should know the offset of the blade to the fence on the saw...
As for a chop saw if you don't know how to pull the tape off the end of your piece and lower the blade down there really is no helping you, same thing with a bandsaw
With 18 years of being paid to fab/errect/install steel I may have a slight idea of how to cut a piece of steel quickly and with accuracy