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Trainersight  /  Free tools  /  One rep max calculator
Free calculator

One rep max calculator
with percentage chart

Enter a weight and reps. Get two estimates and a percentage chart.

Your set

Both figures are estimates. Use a hard set that finished with no reps left.

Estimated one rep max

Epley-
Brzycki-
Average of the two-

Percentage chart

Each row is a percentage of the estimated max. Bars use the average.

PercentEpley kgBrzycki kgAverage

Epley: weight x (1 + reps / 30). Brzycki: weight x 36 / (37 - reps). One rep returns the weight lifted. Estimates get less reliable as reps rise. Test a real max before you prescribe off one.

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