1RM Calculator

Estimate your One-Rep Max (1RM) instantly using four proven strength formulas: Epley, Brzycki, Lombardi, and O’Connor. Enter the weight you lifted and how many reps you performed to see your true strength potential.

This 1RM calculator by Viranto combines multiple science-backed models to give you a balanced and accurate prediction of your maximum lift.

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1RM Calculator

Enter the weight you lifted for multiple reps (use kg or lb, just be consistent).
Enter the number of clean, full reps you completed with that weight.

Estimated One-Rep Max


Tip: Use the average as your main guide and adjust slightly based on experience and comfort.

About This 1RM Calculator

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