There are two ways to calculate your approximate 1RM. Your maximum repetition is called 1RM. The first method is called the “bench press calculator”. This kind of method requires you to provide two data. One is for your total number of successful repetitions. A successful repetition is counted when you can lift the given weight at the preferred distance, following the gym standards for doing such exercise. The second input is for your total amount of weights lifted during the successful repetitions. For example, you are lifting a 30-kilo weight, and then you stop just after the 8th lift, so your input for that is 30-8. These two data will be calculated by the bench press calculator. An approximate estimate is supplied instantly. The result is your 1RM.