Last reviewed: October 7, 2026
REFERENCES

Sources behind the calculators

1RM prediction literature

  • LeSuer DA, McCormick JH, Mayhew JL, Wasserstein RL, Arnold MD. The relationship between 1RM and repetitions-to-failure in the bench press. PubMed.
  • Accuracy of 1RM prediction equations. Contemporary research continues to compare prediction equations and shows that model performance varies by exercise and population. PubMed.
  • Developing Accurate Repetition Prediction Equations. A recent research paper lists and applies Brzycki, Epley, Lander, O’Conner and other equations. PMC.
  • NSCA education. Strength-training and bench-press performance context. NSCA.

Photography credits

Exercise and guide photography is sourced from Pexels. Individual source pages are listed below so image provenance remains transparent.