5 reps → 1RM
395lb
average estimate
8 reps → 1RM
433lb
10 reps → 1RM
460lb
3 reps → 1RM
372lb
Show the math
Epley (5 reps) = 345 lb × (1 + 5 ÷ 30) = 402 lb
Brzycki (5 reps) = 345 lb × 36 ÷ (37 − 5) = 388 lb
If you lifted 345 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 345 | 345 | 345 |
| 2 reps | 368 | 355 | 361 |
| 3 reps | 380 | 365 | 372 |
| 4 reps | 391 | 376 | 384 |
| 5 reps | 402 | 388 | 395 |
| 6 reps | 414 | 401 | 407 |
| 7 reps | 426 | 414 | 420 |
| 8 reps | 437 | 428 | 433 |
| 9 reps | 448 | 444 | 446 |
| 10 reps | 460 | 460 | 460 |
| 11 reps | 472 | 478 | 475 |
| 12 reps | 483 | 497 | 490 |
If 345 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 328 | 2 |
| 90% | 310 | 4 |
| 85% | 293 | 6 |
| 80% | 276 | 8 |
| 75% | 259 | 10 |
| 70% | 242 | 12 |
| 65% | 224 | 15 |
| 60% | 207 | 20 |
How to use it
- Enter your numbers. Switch between US and metric units at any time.
- Results update as you type, and the formula is shown so you can check it.
- Copy the link, save the plan on this device, or print it for your next appointment.
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These are estimates, not a diagnosis. A clinician can account for your health history and medicines.
Other weights
Common questions
What is my 1RM if I lift 345 lb for 5 reps?
About 395 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 345 lb for 10 reps?
About 460 lb. Estimates get less precise above 10 reps.