Everyday tool
One Rep Max Calculator
Enter a weight and the number of repetitions completed with it.
Runs in your browser. No upload.
Values are processed locally in this browser.
Result
About this tool
One Rep Max Calculator made simple.
This is a rough estimate, not a safe lifting prescription. Form, fatigue, equipment and individual differences matter. Do not attempt a maximal lift without suitable experience, equipment and supervision.
Common questions
About One Rep Max Calculator.
How do I use One rep max calculator?
Enter a weight and the number of repetitions completed with it.
Is my data uploaded to a server?
No. This tool runs locally in your browser. Your input is not uploaded.