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One Rep Max Calculator

Estimate a one-repetition maximum from a submaximal set.

ResultEstimated one-repetition maximum: 93.3 kg

Uses the Epley estimate. Do not attempt a maximum lift without appropriate training and supervision.

How to use this calculator

  1. Enter lifted weight and completed repetitions without attempting an unsafe maximum.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

The Epley equation multiplies lifted weight by one plus repetitions divided by 30.

Formula

The Epley equation multiplies lifted weight by one plus repetitions divided by 30.

Step-by-step calculation

  1. Enter lifted weight and completed repetitions without attempting an unsafe maximum.
  2. The Epley equation multiplies lifted weight by one plus repetitions divided by 30.
  3. Check the displayed result, then copy it if needed.

Worked example

Lifting 80 kg for five repetitions estimates a one-repetition maximum near 93.3 kg.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

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