One Rep Max Calculator
Estimate your 1-Rep Max (1RM) without testing it directly. Enter the weight and reps you can perform.
What is One Rep Max?
1RM is the maximum weight you can lift for one complete repetition with proper form. It is used to set training percentages.
How is it calculated?
Brzycki: 1RM = weight / (1.0278 − 0.0278 × reps). Most accurate for ≤10 reps.
Frequently Asked Questions
- Is testing 1RM safe?
- It can be safe with proper warm-up and a spotter, but estimating from sub-max sets is lower risk.