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Formula: estimated 1RM = weight × (1 + reps / 30). The estimate is most useful for moderate rep sets, not true maximal medical testing.
Estimated one-repetition maximum
133 lb
Clinical caution
This calculator is an exercise-science estimate, not a prescription. Older adults, people with CKD, cardiovascular disease, frailty, neuropathy, falls risk, or uncontrolled blood pressure should use resistance training plans individualized by a clinician, physical therapist, or qualified exercise professional.