FREE 1RM CALCULATOR Estimate your one-rep max and training percentages for your APEX program. Weight Lifted Unit kg lb Reps Completed Best used with 1–12 reps CALCULATE 1RM Your Estimated 1RM 95% 90% 85% 80% 75% 70% 65% 60% This is an estimate, not a true max test. Use it to guide training loads safely.