One Rep Max Calculator

A simple one rep max calculator with a comprehensive table.

Calculate your one-rep max (1RM) for any lift. Your one-rep max is the max weight you can lift for a single repetition for a given exercise.
100%
1
95%
2
90%
4
85%
6
80%
8
75%
10
70%
12
65%
16
60%
20
55%
24
50%
30

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