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Strength & 1RM

Brzycki 1RM Calculator

Dedicated implementation of Matt Brzycki's 1993 strength equation

Input Parameters
reps
Real-time calculation updates dynamically as you adjust inputs. Values remain strictly local on your device.
Brzycki 1RM ResultBrzycki 1993
112.5kg

~248 lbs

Clinical Responsibility Note: This calculation provides statistical estimations for informational and educational purposes only. It is not an individualized medical diagnosis or clinical prescription.

Mathematical Formula & Scientific Methodology

Formula: Matt Brzycki Formula (1993)

1RM = Weight × [36 / (37 - Reps)]

Published in the Journal of Physical Education, Recreation & Dance for predicting max strength without maximal strain.

Model Assumptions

  • Reps strictly < 37 (best for reps ≤ 10)

Variables & Standard Units

SymbolPhysiological MeaningUnit
37Theoretical repetition limit constantdimensionless

Scientific Limitations

  • Mathematical asymptote as reps approach 37

Peer-Reviewed Scientific Citations

Strength testing—predicting a one-rep max from reps-to-fatigue (1993)

Brzycki M (1993) — Journal of Physical Education, Recreation & Dance, 64(1), 88-90

Key Finding: 1RM = weight * 36 / (37 - reps). Standard collegiate and high-school protocol for resistance training evaluation.

Frequently Asked Questions

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