Estimate your maximum strength.
AI-generated estimates. No guarantee of accuracy. We assume no liability for decisions based on these results. Independent verification is recommended.
In the world of strength training and powerlifting, your One Rep Max (1RM) is the ultimate benchmark of your physical power. It represents the maximum amount of weight you can lift for a single repetition with proper form. Our One Rep Max Calculator is an essential tool for athletes looking to program their workouts safely and effectively. Instead of risking injury by attempting a dangerous maximal lift, you can simply input the weight you recently lifted and the number of repetitions you completed. The tool utilizes scientifically validated formulas like Epley or Brzycki to estimate your 1RM. This is incredibly practical for everyday training; most professional strength programs are based on percentages of your 1RM. Knowing this number allows you to calculate exactly how much weight to use for your 5x5 sets or hypertrophy blocks, ensuring constant progression and preventing the plateaus that often stall long-term fitness gains.
This calculator uses the Epley Formula : 1RM = Weight × (1 + Reps/30). It is widely considered accurate for reps under 10.
AI-generated estimates. No guarantee of accuracy. We assume no liability for decisions based on these results. Independent verification is recommended.