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Written by the EachTools Team

Last updated: January 2026

How One Rep Max Is Calculated

One Rep Max (1RM) is the maximum weight you can lift for a single repetition. It can be estimated using equations like Epley or Brzycki based on submaximal lifts.

Formula

Epley: 1RM = weight × (1 + reps/30)
Brzycki: 1RM = weight × (36 / (37 - reps))

Steps

Enter the weight you lifted.
Input the number of reps performed (to failure).
Select a calculation formula.
View your estimated 1RM and recommended training percentages.

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