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, please use a weight that you can lift between 1 and 20 times. Refer to the "Estimation methods" section for more detail on the formulas used and how this calculator works.
Modify the values and click the Calculate button to use
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