One-Rep Max

Estimate your 1RM and training loads from a lift.

Enter values

Weight lifted

Reps performed

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1RM = weight × (1 + reps/30) (Epley)

All calculations run locally in your browser and update instantly as you type.

How reliable is a 1RM estimate?+

Formulas like Epley and Brzycki are most accurate for low rep counts (under ~10). This tool averages both. Always warm up and lift safely.

All calculations run locally in your browser. Nothing you type is sent to a server.