One Rep Max Calculator
Estimate your 1RM using 5 proven strength formulas
Enter Your Lift
Enter the number of reps you completed (1-30). Results are most accurate for 1-10 reps.
How It Works
1. Enter Your Lift
Input the weight you lifted and the number of reps you completed
2. Multiple Formulas
We calculate using 5 established formulas and average them for the best estimate
3. Plan Training
Use the percentage chart to determine optimal training weights for each rep range