That is including the weight of the bar. A standard olympic bar weights around 45 pounds, so adding a 45 pound plate on each side gives you 135, 2 45 pound plates on each side 225, 3 45 pound plates on each side 315 pounds, etc. Most people like to talk about their one rep max, but it is a lot safer to see how much you can do for 12 reps (of course it only counts if you go below parallel). A reasonably fit male with some training should be able to do his own body wieght for 12 reps, a good long term target is 1.5 times your body weight for 12 reps. When you can do that you are in the top 1% of the population strength wise.