How it's calculated
1RM = average of Epley w(1 + r/30) and Brzycki w·36 ÷ (37 − r)
w = weight lifted, r = reps completed. Epley = w(1 + r/30), Brzycki = w·36/(37 − r); the result averages both. Suggested training loads = 85% and 70% of the 1RM.
Worked examples
| Weight | Reps | Epley 1RM | Brzycki 1RM |
|---|---|---|---|
| 100 lb | 8 | 127 lb | 124 lb |
| 200 lb | 5 | 233 lb | 225 lb |
| 315 lb | 2 | 336 lb | 327 lb |
Common questions
Which formula should I trust?
Both are widely used. Brzycki tends to read lower at higher reps, so averaging the two gives a balanced estimate.
How do I use the percentage table?
It scales your 1RM to typical training loads, like 70 to 80 percent for hypertrophy and 90 percent or more for max strength.