One-Rep Max Calculator
Estimate your one-rep max (1RM) for a lift from a weight and rep count.
Estimated one-rep max
116.7
How it works
Uses the Epley formula: 1RM = weight × (1 + reps / 30), a widely used estimate for lifts done at higher rep ranges.
How accurate is this?
It's most accurate for rep ranges under about 10 — very high-rep sets tend to overestimate true 1RM.