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Health, Fitness & Sports

One Rep Max Calculator.

Workout inputs and results remain in this browser. Estimate 1RM from weight and repetitions using multiple formulas. Uses transparent local arithmetic and independent verification.

Use One Rep Max Calculator

Private in this browser. Workout inputs and results stay in this browser.

Tool options
Preparing the local tool…

How it works

  1. 01

    Enter measured values, equipment or round settings.

  2. 02

    Run the transparent local calculation.

  3. 03

    Review safety and performance limitations before use.

Frequently asked questions

Is this medical or training advice?

No. It is transparent arithmetic from your inputs.

Does One Rep Max Calculator upload my data?

One Rep Max Calculator runs locally in your browser. Workout inputs and results stay in this browser.

What output does One Rep Max Calculator create?

One Rep Max Calculator creates Json output after the result passes its local verification checks.

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