A one rep max helps you calculate one rep max values accurately and instantly.
Calculate your one-rep max (1RM) using multiple proven formulas.
Uses three formulas: Epley: weight × (1 + reps/30), Brzycki: weight × 36/(37−reps), Lander: weight / (1.013 − 0.0267123×reps). The average of all three is shown as the recommended 1RM.
The One Rep Max Calculator uses standard formulas to calculate your results. Enter your values in the input fields and click Calculate to see instant results.
Yes, the One Rep Max Calculator on CalcMaster is completely free to use with no signup required. Your data stays in your browser and is never sent to any server.
The One Rep Max Calculator uses verified formulas and provides accurate estimates for informational purposes. Results are calculated instantly in your browser.