ProAthletica · Free Tool

1 Rep Max Calculator

Enter what you actually lifted for reps — get your estimated true max, plus a full percentage chart so you know exactly what to load for strength, hypertrophy, or endurance work.

Your Lift
Estimated 1 Rep Max
0
Estimate only — true 1RM varies with technique, rest, and daily fatigue.
Training Percentage Chart
% of 1RMWeightTypical RepsZone