One Rep Max Calculator
Use this One Rep Max Calculator to get fast and reliable results with a clear workflow and practical guidance.
100% Client-Side Processing
All processing happens in your browser. Your input is not uploaded to a server.
Unit
Enter the weight you lifted (not your 1RM, but a weight you can lift for multiple reps).
Enter the number of reps you completed with that weight. For best accuracy, use 3-6 reps.
Different formulas may give slightly different results. Brzycki is the most commonly used formula.
Enter weight and reps above to calculate your one-rep max.
Safety Warning
Table of Contents
What is this tool?
One Rep Max Calculator helps you complete this task quickly and consistently without switching between multiple apps.
It is designed for day-to-day use with clear inputs, practical outputs, and a straightforward user experience.
How it works
- Enter or paste your input data in the fields provided.
- Adjust options to match your use case and preferred output format.
- Review the generated result and copy it for your workflow.
Best practices
- Use realistic sample data first to verify your settings.
- Double-check critical values before sharing or publishing results.
- Save final outputs in your project docs for repeatable workflows.
Frequently asked questions
Yes. You can use this tool directly in your browser at no cost.
Yes. Inputs are processed locally in your browser and are not sent to a server.
Yes. The tool is designed to work on both desktop and mobile browsers.