One Rep Max Calculator
Estimate 1RM from reps and weight using multiple formulas.
5 formulas
Strength tracking
Average estimate
Safer strength testing
Rep-based estimates help you gauge strength without maxing out on every lift.
Assumptions
Formulas estimate 1RM from submax sets and are less reliable at very high rep counts.
Compare formulas
Different formulas bias slightly high or low depending on rep count. The average provides a solid target.