One Rep Max Calculator

Estimate your 1-rep max from any lift using the Epley, Brzycki, and Lombardi formulas.

Weight lifted (kg)

Reps performed

Enter weight and reps.

How to use

Enter the weight lifted and reps performed to estimate your 1-rep max.

Which formula should I trust?

Epley is the most popular; Brzycki is conservative; Lombardi suits higher reps. The tool shows all three plus an average.

Is this accurate for high reps?

Estimates get less reliable above 10 reps. Use a true 1RM test with a spotter for competition; general guidance only.

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