One Rep Max Calculator - 1RM is a free iPhone application developed by Brian Mcabee, falling under the Lifestyle category with a focus on Health & Fitness. This simple calculator is designed to help users determine their one-rep max for optimal gym performance. By inputting the weight lifted and the number of reps completed, users can instantly view their calculated one-rep max on the screen.

Utilizing the Brzycki Formula, this 1RM calculator provides users with an accurate estimation of their strength levels based on their performance in sets of 10 reps or less. It emphasizes the importance of using lower repetition sets for more precise 1RM estimations, making it a valuable tool for weightlifters aiming to enhance their workout routines.