One Rep Max Calculator
Use this One Rep Max (1RM) Calculator to estimate the maximum weight you can lift for a single repetition based on the number of repetitions you can perform with a certain weight. For the most accurate estimate, use a weight you can lift between 1 and 10 times.
i
Modify the values and click the Calculate button to use
times (1-10)
Result
Enter weight and reps, then click Calculate.
Note: Formulas: Brzycki, Epley, Lander, Lombardi, Mayhew et al., O'Conner et al., Wathen. For best accuracy, use 1-10 reps. Results are estimates and may vary.