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Suppose you must determine your maximum load (1RM) for a weight training exercise. In that case, there is a way of obtaining an approximate value based on the weight you used and the number of repetitions you can perform before failure for that exercise.

Equations to determine 1RM

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

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

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

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

The Epley (1985)[3] equation is as follows:

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

The Landers (1985)[4] equation is as follows:

• (100 × Weight) ÷ ( 101.3 - (2.67123 × Number of repetitions ) )

These equations provide a reasonable estimate of the 1RM (maximum load), providing the number of repetitions does not exceed 10.

Enter the weight and the number of repetitions, and select the Calculate Button. Estimates of the 1RM (maximum load) will then be displayed for each equation.

 Weight Repetitions Brzycki Baechle Epley Landers