Estimate your one-rep max

How One Rep Max Calculator works

The numbers are put through a published formula and the formula is printed beside the result. Nothing is sent to a clinician, an insurer or an advertiser — and nothing is stored for later. That is also the limit of it: an estimate cannot examine you, and it says so on the page.

That is the whole architecture: static files, one script, no upload endpoint to leak or log. Close the tab and the work is gone.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions