Is this One-Rep Max Calculator free to use?

Yes, One-Rep Max Calculator is 100% free to use online with no installation or account required.

How do I use the One-Rep Max Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

One-Rep Max Calculator — Free Online Tool

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Calculate 1RM from weight and reps

Note: Uses Epley, Brzycki, and Lombardi formulas. Average gives best estimate.

Lift

Weight (kg)

Reps

⚠️ For educational and training purposes only. Consult a coach, physician, or certified trainer before making training or health decisions.