Strength

One-Rep Max (1RM)

Estimate your max lift from a weight and the reps you can do with it.

How it works. Epley: 1RM = w × (1 + reps⁄30). Brzycki: 1RM = w × 36⁄(37 − reps). Estimates are most accurate under ~10 reps. Units are whatever you enter (lb or kg).