Calculate your absolute 1-Rep Max instantly using validated lifting formulas and get a complete percentage breakdown.
Knowing your One-Rep Max (1RM) is essential for any structured strength or bodybuilding program, but testing it safely to failure can be risky. This tool uses verified mathematical models (like Epley and Brzycki) to estimate your maximum lifting capacity safely based on your sub-maximal sets.
Enter the weight you lifted and the number of repetitions completed (up to 10 reps for maximum accuracy). The tool calculates your theoretical 1RM and prints out a clean tracking chart showing exactly what your 70%, 80%, and 90% training weights should be for your next workout.
Yes, 100% Free! Powerlifters and bodybuilders can map out their lifting splits without hitting a paywall or registering an account.