One Rep Max Calculator

Estimate your one-rep max (1RM) - the most weight you can lift for a single rep - from a set you've already done. Enter the weight and reps below to see your estimated max and every training percentage.

Repetition percentages of your 1RM

% of 1RMWeightReps
100%-1
95%-2
90%-4
85%-6
80%-8
75%-10
70%-12
65%-16
60%-20
55%-24
50%-30