One-Rep Max (1RM) Calculator

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Estimates the maximum weight a person can lift for a single repetition (1RM) based on the weight lifted and the number of repetitions performed.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Weight Lifted and Number of Repetitions in the units shown.

Step 2

Read Estimated One-Rep Max (1RM) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Weight Lifted: 100 lbs; Number of Repetitions: 10

Estimated One-Rep Max (1RM): 133.3688984 lbs

Weight Lifted: 150 lbs; Number of Repetitions: 8

Estimated One-Rep Max (1RM): 186.2428607 lbs

Weight Lifted: 200 lbs; Number of Repetitions: 5

Estimated One-Rep Max (1RM): 225.0225023 lbs

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