One-Rep Max Calculator
One-Rep Max Calculator
Estimate your 1RM from a completed set.
How it works
A one-repetition maximum is the greatest load lifted for a single repetition in a specific movement. This tool uses an equation to estimate it from a completed set.
Using this calculator
Use the total external load and a recent set of 1–10 completed repetitions. A single completed repetition returns the entered load; for 2–10 repetitions the Epley equation is used.
What to keep in mind
Accuracy varies by exercise, effort and experience. This result is not a reason to attempt a maximal lift, and the percentage examples are not a training program.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.