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1 Rep Max Calculator — Free Online Calculator

1 Rep Max works out 1 rep max the moment you enter your figures. All processing happens client-side in your browser, with nothing sent to a server. Free, unlimited, and no registration needed.

How to use 1 Rep Max

1. Enter your known values in the fields.
2. The result updates instantly as you type.
3. Copy or note down the result.

Frequently asked questions

How does 1 Rep Max compute its result?

It applies the standard formula for this calculation in your browser, in full floating-point precision, and rounds only what is displayed.

Can I use it on my phone?

Yes. The layout adapts to small screens and behaves the same on mobile as on desktop.

Is my input saved anywhere?

No. Values stay in your browser and are gone as soon as you close the tab.

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