This document provides a table to calculate a 1 repetition maximum (1RM) based on the number of repetitions completed at a given weight. It then provides examples calculating 1RMs for Harry Potter, Hermione Granger, Ron Weasley, Ginny Weasley, and Albus Dumbledore based on reps completed at various weights for different exercises. It concludes by explaining the three step process to use the table to estimate a 1RM.