Bench Press Calculator
Calculate bench press 1RM, working percentages, and strength standards
1.31× bodyweight (~231 lbs)
Mathematical Formula & Scientific Methodology
Formula: Bench Press 1RM Synthesis
Bench 1RM = Weight × (1 + Reps/30)Combines Epley projection with standard athletic bodyweight strength standards.
Model Assumptions
- Touch-and-go or paused bench press with unbroken bar path
Variables & Standard Units
| Symbol | Physiological Meaning | Unit |
|---|---|---|
| Ratio | Bench Press 1RM / Body Weight | dimensionless |
Scientific Limitations
- Bouncing the bar off the chest invalidates submaximal predictions
Peer-Reviewed Scientific Citations
Muscular endurance repetitions to predict one-rep max in college men and women (1992)
Mayhew JL, Ball TE, Arnold MD, Bowen JC (1992) — Journal of Applied Sport Science Research, 6(4), 200-206
Key Finding: 1RM = (100 * weight) / (52.2 + 41.9 * e^(-0.055 * reps)). Highly evaluated for bench press predictions.
Poundage chart. Boyd Epley Workout (1985)
Epley B (1985) — University of Nebraska-Lincoln Strength Training Manual
Key Finding: 1RM = weight * (1 + reps / 30). Highly accurate for resistance exercises within 1 to 10 repetitions.
Frequently Asked Questions
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