About the One Rep Max Calculator

BarbellMax is a free one rep max calculator. Enter a weight and the reps you lifted it for, and it estimates your 1RM by averaging three proven formulas: Epley, Brzycki, and Wathan. Use it for squat, bench press, deadlift, weighted pull-ups, or any custom lift you add. Every logged max builds a history, so you can watch your strength climb over months of training.

Below your estimate, the training load table shows every percentage from 95 down to 20, the numbers you need for percentage-based programming. Tap any load and the plate calculator shows exactly what to put on the bar. Your Max Load total combines your big three for a running powerlifting total.

Everything saves on your device. No ads, no account required, no tracking. Sign in only if you want sync across devices. Also available for Android.

Learn more: How to Calculate Your One Rep Max · The Science Behind 1RM Formulas