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One rep max calculator
Your estimated 1RM from any set, with a percentage table for training weights.
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- Works on any device
About One rep max calculator
Estimate the heaviest weight you could lift once from a set of several reps, using the Epley formula: weight times (1 plus reps divided by 30). It also gives a percentage table so you can pick training loads. Estimates are most accurate for sets of 10 reps or fewer.
How to use One rep max calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
Is it safe to test a real one rep max?
It carries injury risk without warm-up and a spotter. An estimate from a heavy set of 3 to 5 reps is a safer way to track strength.
Is One rep max calculator free?
Yes. One rep max calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.