The Epley Formula, presented by Boyd Epley in 1985, is a formula for calculating one-repetition maximum. It is perhaps the easiest formula to remember, and is pretty accurate for calculating 1RM.

The formula is as follows:

Weight × ( 1 + ( 0.033 × Number of repetitions ) )

An enthusiastic Athlete can bench press 270lbs for 10 repetitions. Now he wants to look at the 1RM bench press... Based to the Epley Equation the athlete's 1RM is 360lbs in the bench press, because:

1RM = (0.033 x 10) x 270) + 270 = 360 pounds

Brzycki's equation to determine Max load

The Brzycki (1993)^[1] equation is as follows:

• Weight ÷ ( 1.0278 - ( 0.0278 × Number of repetitions ) )

Baechle equation to determine Max load

The Baechle (2000)^[2] equation is as follows:

• Weight × ( 1 + ( 0.033 × Number of repetitions ) )