This bench press calculator can be used to work out your approximate 1 REP MAX bench press. The way this bench calculator works is it takes the amount of weight you can bench for a certain number of reps and uses a formula to calculate your approximate 1 REP MAX. Obviously, these figures are not 100% accurate.
To use the bench press calculator simply enter the weight in the first box provided and select the number of reps from the drop down box. For example, if I benched 100kg for 10 reps I would enter 100 and select 10 reps. The bench press calculator works in both pounds and kilograms.