Calculate your one-rep maximum (1RM) for any weightlifting exercise using proven formulas like Epley, Brzycki, and Mayhew. Essential for programming strength training and tracking progress.
Enter your values below
The maximum weight you lifted for the given reps.
Number of reps performed at the given weight.
Choose the estimation formula to use.
How this calculator works
The Epley formula estimates your one-repetition maximum by multiplying the weight lifted by (1 plus the number of reps divided by 30). Brzycki uses w × (36 / (37 - r)) and Mayhew uses w × (100 × r) / (52.2 + 0.32 × r).
Common questions about this calculator
Exercise recommendations are general guidelines. Consult a physician before starting any new exercise program, especially if you have health conditions.
