Free tool
1-Rep Max Calculator.
Estimate your true 1RM from a working set. No need to actually test a max lift.
117 kg
Estimated 1-rep max
100%117 kg
95%111 kg
90%105 kg
85%99 kg
80%94 kg
75%88 kg
70%82 kg
65%76 kg
60%70 kg
55%64 kg
50%59 kg
Use this table to program working sets off percentages instead of guessing, e.g. 80% for a solid 5-6 rep strength set.
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