One Rep Max Calculator
Estimate your one-rep max from any set
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use One Rep Max Calculator
Estimate your one-rep max from any set. No signup, no uploads, no watermarks.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why choose One Rep Max Calculator?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
Frequently Asked Questions
What is a one-rep max?▾
A one-rep max (1RM) is the maximum weight you can lift for a single repetition. It is the standard benchmark for measuring strength across lifts like the bench press, squat and deadlift.
How accurate is the Epley formula?▾
The Epley formula predicts 1RM within a few percent for most lifters when reps are below 10–12. It becomes less reliable for very high-rep sets.
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