1-Rep Max Estimator
Estimate your one-rep max (1RM) from a submaximal lift. Enter the weight you lifted and the number of reps you completed, and get results from three proven formulas — Epley, Brzycki, and Lombardi — plus a percentage chart and warm-up pyramid.
How are the formulas calculated?
Three widely-used formulas estimate your 1RM from submaximal data. Each works best in slightly different rep ranges, so we average all three for a more reliable estimate.
Epley (1985):
1RM = weight × (1 + reps / 30)
Brzycki (1993):
1RM = weight × 36 / (37 − reps)
Lombardi (1989):
1RM = weight × reps0.10
These formulas are most accurate in the 2–10 rep range. At very high rep counts (15+) accuracy decreases. If you enter 1 rep, the weight you lifted is your 1RM.
Tip: Use your most recent set where you reached technical failure or near-failure for the most accurate estimate.