(Completely free and ad free). Want to know how much weight you can workout with for 8 reps based on how much you can do of say 14 reps? Well this is the app for you. A simple interface for ease of use. This app uses the Matt Brzycki formula to calculate your 1 rep max and from that your 2 to 16 rep max to the closest half unit of weight. It works for Kilograms and Pounds alike or any unit of weight. For best results input 20 reps or less. The higher the reps you put in the less accurate the formula. Try 37 for example, it gives you infinity as the result and anything higher gives a negative result. The creator of this app takes no responsibility for workout injuries of users. Always use a spotter. Enjoy!