One-Rep Max (1RM) Calculator
Determine your highest absolute limits mathematically without risking injury under the bar.
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The Brzycki Formula
Maxing out (lifting a weight you can only handle for a single repetition) stresses the central nervous system rapidly and increases injury risk. Using Matt Brzycki's mathematical strength formula Weight / (1.0278 - 0.0278 × Reps), athletes can perform a safe 5-rep max and flawlessly extrapolate what their 1-rep limit is.