Calculator
One-rep max (1RM) calculator: the Brzycki equation
Enter the load lifted and the repetitions completed to failure, from 1 to 12. With one repetition, the 1RM is the load itself.
The formula
Estimated 1RM = load (kg) × 36 ÷ (37 − repetitions)
Brzycki (1993), Journal of Physical Education, Recreation & Dance 64(1):88-90. The equation estimates; it is not a clinical report and does not replace a direct measurement. It is the same calculation StatsCenter applies when a club collects.
Result
Estimated 1RM92.9kg
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