One Rep Max Calculator

Estimate 1RM using Epley, Brzycki, Lombardi, and O'Conner formulas.

How to use One Rep Max Calculator

Enter the values requested by the calculator.
Review the result, formula and detailed breakdown.
Adjust inputs or copy, print and share the result.

Processing and privacy

The supported processing runs locally in your browser.

This tool has a real browser-side processing path and passed representative verification.

Common questions

Is One Rep Max Calculator available now?

Available now and verified for normal production use.

Where does processing happen?

The supported processing runs locally in your browser.

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