This has probably been done to death, but search didn't throw up much...
to calculate your potential one rep max, if for example you had done 2 sets of 6 reps, would you use 6 or 12 in the calculation??
you won't know if you try.
If you never go below 6 reps. then i would work my way up there to see what you can do as caculators have a fair room for error.
my exprience - joined gym 10 years ago, 6 1/2 years hard weight training exprience.
why can't u just do ur one rep max? for example, even if u have an injury, u can't say u can bench 225 as a max if u've never done it.
"No one can completely believe that I am natural.
The most important drug is to train like a madman
-really like a madman
The people who accuse me are those who have never trained once in their life as I train every day of my life."
Ten-time World Greco-Roman Champion
1988, 1992, 1996 Olympic gold medalist
current stats (10/19/03): 20yrs, M, 5'4 @160lbs, ~11% body fat
lifted since march 2000
occupation:MCB major @ uc berkeley
While I'm still trying to translate Podiums' example, I'm pretty sure I agree with him. You never really know if you can until you do it. Using equations and all that might work wonderfully, but at the same time, it probably won't.
So if you really want to know what your max is, then do it. Start adding weight and working in 3reps until you get to a weight where you can do it, but know you'd be pushing it next time you added weight, then start working in 1 reps till you can't do it. Simple as that.