How to Calculate a one-rep max
Step-by-step guide to calculate a one-rep max with Toolenza's free one-rep max tool. Works in your browser — no upload, no account required.
The fastest way to calculate a one-rep max is with a browser-based calculator tool that runs locally, keeps your data on your device, and skips the wait, watermarks and account walls that make bigger platforms slow. This guide walks through the four steps: open the tool, bring in your load and reps, configure the run, and download your estimated 1RM plus % tables.
Predict 1RM from a working set
Step-by-step
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1Open Toolenza One-Rep Max
Head to the One-Rep Max tool on Toolenza — it loads in-browser with no sign-up.
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2Bring in Your load and reps
Drop, paste or type your load and reps into the tool. Everything stays on your device.
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3Type the weight lifted and the reps completed
The tool previews the result as you tweak so you can iterate before exporting.
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4Download your estimated 1RM plus % tables
Click Download (or Copy) to save your estimated 1RM plus % tables. Files are generated on your device — nothing is uploaded.