aprox.squat max help

[Ironloo]

today i did squats 325lb. 11 reps could have got 1 or 2 more and 275lb. 25 reps about what would my max be i cant really max out right now im in a basement as of now working out and it wont be to fun pinned to the floor by the weight.any help much appreciated.

[rckvl7]

I have found this site to be somewhat accurate: http://www.exrx.net/Calculators/OneRepMax.html
The only way to really know though is to do it.