n rep max calculator

Weight Use any units (pounds / kilograms / etc.)
Reps Accurate for values values from 1 to 10.
Round to weight Decimal values are valid ("0.25").

This uses the Brzycki formula.

Enter the amount of weight you lifted, and the number of times you lifted it (reps). This formula is accurate for 1 to 10 reps. It will calculate the approximate maximum amount of weight you should be able to lift for 1 to 10 reps, and will also give you percentages of your one rep max which are used by a number of exercise routines.

All values are rounded to the value you specify. If your plates allow you to do 5 pound increments, and you specify 5, it will round to the closest value you can set on your bar.

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