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Online One Rep Max Calculator

This free one rep max calculator allows you to calculate your theoretical 1 rep max, based on how much weigh you've used before. It may take a few seconds to load. Just enter the amount of weight you did, and the number of reps you did. It will estimate how much you could lift once. This is only an estimate! Don't try to lift a certain amount of weight based on this estimate! Always use a spotter!

This 1RM calculator is also included in our fitness tracking software, Open Fitness, which allows you to track workouts, diet, supplement usage, body measurements, and more!




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