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A One-Rep Max (1RM) calculator is a tool used in strength training to estimate the maximum amount of weight a person can lift for one repetition of a given exercise. This calculation is crucial for athletes and fitness enthusiasts as it 1rm calculatorhelps determine appropriate weights for training programs and ensures that workouts are challenging yet safe. To use a 1RM calculator, individuals typically input the weight they can lift for a certain number of repetitions (usually between 1 and 10).