Pevlika Browser Apps

One Rep Max Calculator

Estimate your 1RM from a submaximal set, with training loads.

Runs in your browser — nothing is uploaded
kg or lb — results use the same unit.

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Informational estimates only — not medical or training advice.

How to use One Rep Max Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

Epley: 1RM = w × (1 + reps/30)

Brzycki: 1RM = w × 36 / (37 − reps)

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