One-rep max (1RM) calculator
Enter the weight lifted and the number of reps: estimate your one-repetition max.
What it's for
The one-rep max (1RM) is the weight you could lift just once. It's used to set training loads as a percentage, without actually testing it (which is risky).
Note
The estimate is more accurate with few reps (3-6). With many reps the error grows.