One Rep Max Calculator — Lift Strength Estimate
Estimate your one-rep max from any set
How to Use One Rep Max Calculator
Estimate your one-rep max from any set No signup, and nothing gets uploaded for most use.
- 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 you might like it
- Nothing to upload — the work happens on your device.
- Free with no signup, no watermarks, and no daily limits.
- Works in any modern browser on any device — nothing to install.
- Usually done in a few seconds, so it doesn't get in your way.
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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