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One Rep Max (1RM) Calculator
Estimate your one-rep max from the weight and reps of any set with the Epley and Brzycki formulas, with a training percentage table.
Tip from Tink: Use a hard set of 3–8 reps for the best estimate.
Estimated 1RM
114.6
Epley
116.7
Brzycki
112.5
95%
108.9
90%
103.1
85%
97.4
80%
91.7
75%
86
70%
80.2
65%
74.5
60%
68.8
55%
63
50%
57.3
45%
51.6
40%
45.8
Most accurate for sets of 10 reps or fewer.
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How to use the One Rep Max (1RM) Calculator
- Enter the weight you lifted.
- Enter how many reps you did.
- Use the % table to plan training weights.
Everything runs in your browser. Nothing you enter is uploaded.