Maximum Load (1RM)

Suppose you need to 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 ) )

Max Load Calculator

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

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

Weight		Repetitions
Brzycki		Baechle		Epley		Landers

Free Calculator

Max Load Calculator - a free Microsoft Excel spreadsheet which you can download and use on your computer.

References

BRZYCKI, M. (1993) Strength testing-Predicting a one-rep max from reps-to-fatigue. JOPERD, 68, p. 88-90
BAECHLE, T.R. and EARLE, R.W. and WATHEN, D. (2000) Resistance training. In: BAECHLE, T.R. and EARLE, R.W., eds. Essentials of Strength Training and Conditioning. 2nd ed. Champaign, IL: Human Kinetics, p. 395-425
EPLEY, B. (1985) Poundage Chart. Boyd Epley Workout. Lincoln, NE: Body Enterprises.
LANDERS, J. (1985) Maximums Based on Reps. National Strength and Conditioning Association Journal. 6: 60-61.

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