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One Rep Max

1RM strength calculator

100
5

How It Works

Use this One Rep Max (1RM) Calculator to estimate the maximum weight you can lift for a single repetition based on the number of repetitions you can perform with a certain weight.

A "one rep max" (one-repetition maximum) is the maximum weight a person can lift for one complete repetition of a specific exercise while maintaining proper form.

Knowing your one rep max (1RM) is valuable because it provides a quantitative measure (or estimate) of your maximal strength for a given exercise, which enables you to design a workout program and train accordingly based on your goals.

The two primary methods for measuring one rep max are direct measurement by performing a strength test for a given exercise and using estimation methods.

Results

Enter values to see results

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Quick Tips

  • • Results update automatically as you type
  • • Use Tab to navigate between fields
  • • Press Enter to calculate

Frequently Asked Questions

How does the One Rep Max work?
Simply enter your values into the input fields above. The One Rep Max uses standard formulas to compute results instantly as you type or click.
Is the One Rep Max free?
Yes, this calculator is completely free to use. No registration, no hidden fees, no limits.
How accurate are the results?
Results are computed using industry-standard mathematical formulas. For critical decisions, we recommend consulting a professional.
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