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One Rep Max Calculator

Estimate one-rep max from weight lifted and reps using the Epley formula.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

kg

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

1RM ≈ weight × (1 + reps / 30)

In depth

Estimate one-rep max from weight lifted and reps using the Epley formula.