One Rep Max Calculator - 1RM Calculator

Calculate your one rep max (1RM) instantly. Free online 1RM calculator for weightlifting, powerlifting, and strength training with Epley and Brzycki formulas.

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About Formula

Preguntas frecuentes

How does this tool work?

This is a free online one rep max calculator - 1rm calculator. Simply enter your input and get instant results. All processing happens in your browser.

Is this tool free to use?

Yes! This tool is completely free with no signup required.

Does this tool work on mobile?

Yes, this tool is fully responsive and works on all devices.

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