Epley 1RM Calculator
Dedicated implementation of Boyd Epley's 1985 linear strength formula
Input Parameters
Real-time calculation updates dynamically as you adjust inputs. Values remain strictly local on your device.
Epley 1RM ResultEpley 1985
116.7kg
~257 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: Boyd Epley Formula (1985)
1RM = Weight × (1 + Reps / 30)Developed at the University of Nebraska-Lincoln, this remains the most universally cited 1RM formula.
Model Assumptions
- Submaximal effort performed to failure
Variables & Standard Units
| Symbol | Physiological Meaning | Unit |
|---|---|---|
| 30 | Epley empirical repetition divisor constant | dimensionless |
Scientific Limitations
- Can slightly overestimate for reps > 10
Peer-Reviewed Scientific Citations
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
Related Calculators & Next Steps
Strength & 1RM
Brzycki 1RM Calculator
Dedicated implementation of Matt Brzycki's 1993 strength equation
Calculate now
Strength & 1RM
One Rep Max Calculator
Calculate maximum single-repetition lift capacity across Epley, Brzycki, and Lander formulas
Calculate now
Strength & 1RM
1RM Calculator
Fast 1RM calculation for weightlifting and powerlifting programming
Calculate now