One Rep Max (1RM) Calculator

All tools

Estimate your one-rep max from a lighter set using the Epley, Brzycki or Lombardi formula, plus a full training-percentage table for every lift.

kg
Estimated 1RM –
Training percentages
% Weight Reps
Estimates are most accurate for sets under 10 reps. Train within your limits and use a spotter for maximal lifts.
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