One Rep Max (1RM) Calculator

Estimate your one-rep max (1RM) for any lift using the Epley and Brzycki formulas. Knowing your 1RM helps program training intensity.

About 1RM Calculator

Estimate your one-rep max (1RM) for any lift using the Epley and Brzycki formulas. Knowing your 1RM helps program training intensity. This tool uses scientifically validated formulas to provide accurate results. All calculations are performed instantly in your browser.

How to Use

  1. Enter your values in the fields above
  2. Click the "Calculate" button to see your results
  3. Review the detailed breakdown of your results

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