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One Rep Max (1RM) Calculator

Calculate your estimated one-rep max and get training percentages for all your lifts

Your Lift

Most accurate for 1-12 reps

How to use:

  1. Enter the weight you lifted
  2. Enter how many reps you completed
  3. Get your estimated 1RM and training zones
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Enter your lift details to calculate 1RM

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Important Note

This calculator provides estimates only. Always use proper form and have a spotter when attempting heavy lifts. Consult with a qualified trainer before maxing out.