Fitness
One Rep Max Calculator
Estimated 1RM using the Epley formula.
Free to use — no sign-up or login.
Estimated 1RM
Amortization schedule
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This free One Rep Max Calculator covers Estimated 1RM using the Epley formula.
Epley estimates max from a submax set. Related fitness tools sit beside How it works, with no account required.
Using the One Rep Max Calculator
Estimated 1RM using the Epley formula. Typical inputs are Weight lifted and Reps. How it works beside the form states the identity the One Rep Max Calculator applies.
FAQ
How do I use the One Rep Max Calculator?
Open the One Rep Max Calculator, fill Weight lifted and Reps, and read the result. Enter Weight lifted and Reps for the One Rep Max Calculator; use positive Weight lifted and a realistic whole-number Reps count. The calculator reports Estimated 1RM: Epley estimates max from a submax set. The estimate becomes less reliable for very high repetition counts or nonmaximal sets.
What formula does the One Rep Max Calculator use?
The One Rep Max Calculator uses the identity in How it works. In words: Enter Weight lifted and Reps for the One Rep Max Calculator; use positive Weight lifted and a realistic whole-number Reps count. The calculator reports Estimated 1RM: Epley estimates max from a submax set. The estimate becomes less reliable for very high repetition counts or nonmaximal sets.
Assumptions and limitations
These fitness results are not a medical diagnosis or treatment plan. They use the named screening formulas only and cannot replace advice from a qualified clinician.