One Rep Max Calculator
1RM strength estimate.
Result
Estimated one-rep max
215.8lb
Common questions
How do I calculate my one-rep max without actually lifting it?
Use a submaximal test: lift a weight for multiple reps (3–10), then apply a formula like Epley (1RM = Weight × (1 + Reps/30)) or Brzycki. The calculator supports several common formulas.
How accurate are one-rep max estimates?
Estimates are most accurate with 3–5 reps. Above 10 reps, accuracy decreases significantly. The formulas also tend to overestimate for isolation exercises compared to compound lifts.