Physiotherapy
One-Repetition Maximum (1RM) Strength Calculator
Estimates 1RM maximum strength and percentage training loads from submaximal reps.
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Parameters
One-Repetition Maximum (1RM) Strength Calculator Result
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Formula
Brzycki: 1RM = Weight / (1.0278 - [0.0278 × Reps])
Epley: 1RM = Weight × (1 + [0.0333 × Reps])
Lander: 1RM = (100 × Weight) / (101.3 - [2.67123 × Reps])Clinical Pearls
Eliminates the acute musculoskeletal injury risk of testing true maximal 1RM loads in recovering orthopedic and physical therapy patients.
Limitations
Calculations are most reliable when submaximal testing is performed within 2 to 10 repetitions to voluntary fatigue.