Fitness tools

1RM calculator

Enter weight and reps — your estimated 1RM updates instantly.

What is 1RM?

1RM (one-rep max) is the estimated heaviest load you can lift once with good form.

This tool uses the Epley formula. Treat the result as a training guide, not a max attempt.

  • Enter weight and reps
  • See your estimated 1RM instantly
  • Get 70–90% working weights

These tools are for information only and are not medical or training advice.

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Estimated 1RM

Enter weight and reps to see your result here.