One-Rep Max (1RM) Calculator
1RM estimation using Epley, Brzycki, Lander, Lombardi formulas.
Lift
1RM
Formulas
Epley
w × (1 + r/30)
Brzycki
w × 36 / (37 − r)
Lombardi
w × r^0.1
Accuracy
Best for 2–10 reps; degrades beyond
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