Calculate your one-rep max using multiple proven formulas
Uses Rate of Perceived Exertion for the most accurate estimation. Best for experienced lifters who can gauge their effort level. Takes into account how close you were to failure.
The most popular formula used worldwide. Provides reliable estimates for 1-10 reps. Formula: Weight × (1 + 0.0333 × Reps)
Conservative estimate that tends to underestimate slightly. Best for 2-10 reps. Often used in research and strength programs.
See results from all formulas and get an average. Useful when you want a comprehensive view or are unsure which formula to trust.