Estimated one-repetition maximum (1RM)

The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.

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Calculation

Units

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

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This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.

Result

Author-defined Epley / Brzycki average
115 kg

The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.

Epley Formula (1985)
117 kg

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

Brzycki Formula (1993)
113 kg

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

Lombardi Formula (1989)
118 kg
Wathan Formula (1994)
117 kg
Mayhew et al. Formula (1992)
119 kg
100% 1RM
115 kg
95% 1RM
109 kg
90% 1RM
103 kg
85% 1RM
97 kg
80% 1RM
92 kg
75% 1RM
86 kg

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

How it is calculated

The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.

Formula

Epley: w × (1 + r/30); Brzycki: w / (1.0278 − 0.0278 × r); Lombardi: w × r^0.10; Wathan: 100 × w / (48.8 + 53.8 × exp(−0.075 × r)); Mayhew: 100 × w / (52.2 + 41.9 × exp(−0.055 × r)). w: weight, kg; r: repetitions. At r = 1 all estimates equal w.

Limits of the method

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

Sources of the method

How to use the calculation

1

Enter the starting values

The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.

2

Adjust the parameters

Epley: w × (1 + r/30); Brzycki: w / (1.0278 − 0.0278 × r); Lombardi: w × r^0.10; Wathan: 100 × w / (48.8 + 53.8 × exp(−0.075 × r)); Mayhew: 100 × w / (52.2 + 41.9 × exp(−0.055 × r)). w: weight, kg; r: repetitions. At r = 1 all estimates equal w.

3

Read the result

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

Frequently asked questions

What does the calculation show?

The main result is an author-defined average of Epley and Brzycki. Individual equations and arithmetic percentages of that average are shown below.

What limitations apply?

Enter the load and repetitions completed in a set to failure. Accuracy depends on exercise and technique and decreases with high repetitions. A load percentage does not guarantee a specific number of repetitions.

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