Advanced
Estimate one-rep max with multiple formulas RPE and rounding
FAQs
Multiple methods are shown because accuracy varies by lift training age movement pattern and repetition range. Use the robust average and your own history to calibrate.
RPE accounts for reps in reserve. Lower RPE increases the effective rep count slightly which raises the 1RM estimate to reflect submax effort.
Pick the unit you load on the bar. All math runs internally in kilograms then converts back to your selection so results match your plates.
Use 2.5 for typical kilogram plates and 5 for pound plates. Set zero if microloading or if you prefer exact numbers without plate rounding.
Yes. Bench press often aligns with Mayhew or Wathan while squat and deadlift can favor Epley or O’Conner. Compare methods and use your log to decide.
Formulas are most reliable between 1 and 12 reps. Beyond that error grows. Consider testing a heavy triple or single and recalculating for better precision.