MagicKit.ai

One Rep Max Calculator

Calculate your one rep max (1RM) for any lift. Estimate max strength using weight and reps performed.

How to Calculate Your One Rep Max

  1. 1 Enter the weight you lifted
  2. 2 Enter the number of reps you completed
  3. 3 Select your preferred formula (Brzycki, Epley, or Lander)
  4. 4 Click Calculate 1RM to see your estimated maximum
  5. 5 Use the training percentages table for workout planning

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Last updated: January 15, 2026 · v2.1