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Performance · Free
One Rep Max Calculator
Estimate your 1RM from any working set — no risky max attempt needed. Formula-based estimates are within a few percent for most people in the 3–10 rep range.
Estimated 1RM (Epley)
93 kg
weight × (1 + reps/30) — the most common estimate.
Estimated 1RM (Brzycki)
90 kg
A second formula — take the average of both.
Projected RM table
1RM
83
2RM
85
3RM
88
4RM
91
5RM
93
6RM
96
7RM
99
8RM
101
9RM
104
10RM
107