oneRM helps you to calculate your 1 Repetition Maximum from 2-20 max effort performed Repetitions. It uses most common formulas to estimate your 1RM. 'Go grab a Barbell and try it in your Gym or your local CrossFit Box'. Highlights: Simple modern User Interface. 1 RM calculation. Custom exercises. Logbook. Listview: 5-3-1 basic Wendler training.