A person often may be asked what is the maximum you can bench, to avoid getting hurt if your not a seasoned weight lifter maximum 1 repitition weight could get you hurt. The following creates a chart that can be used to calculate your 1 rep max.

Other uses for this chart can be, if you know your 10 rep max weight, and now you're being asked to lift your 6 rep max weight, use this chart. First go to the 10 repition column, look down that column to find your weight you've been lifting, then move to your left to the 6 rep column. The weight in that column represents your maximum weight that you can lift 6 times.

To use this,
Enter a starting weight. This is the weight the table will start on and build up from there.
Enter an increment amount. This will be the amount each one rep weight increases on this chart.