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One Rep Max (1 RM) Calculator

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Use this calculator to estimate your one repetition maximum from reps performed with any weight.

Determining your 1RM (Rep Max)

  What is 1 Rep Max?

One Repetition Maximum. This is the WEIGHT you can perform an exercise with ONCE. Using a calculator is usually the best and safest way to determine your 1RM, based on the amount of times you can lift a less heavy weight.
 

How do I measure my 1RM?

weight

Use the calculator to approximately work out what your 1RM is. After your warm up, use a weight with which you can perform less than 10 repetitions before you reach failure. Fill out those numbers on the left and click Calculate to find out your 1 RM.

reps

1RM
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