5 reps → 1RM
361lb
average estimate
8 reps → 1RM
395lb
10 reps → 1RM
420lb
3 reps → 1RM
340lb
Show the math
Epley (5 reps) = 315 lb × (1 + 5 ÷ 30) = 368 lb
Brzycki (5 reps) = 315 lb × 36 ÷ (37 − 5) = 354 lb
If you lifted 315 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 315 | 315 | 315 |
| 2 reps | 336 | 324 | 330 |
| 3 reps | 346 | 334 | 340 |
| 4 reps | 357 | 344 | 350 |
| 5 reps | 368 | 354 | 361 |
| 6 reps | 378 | 366 | 372 |
| 7 reps | 388 | 378 | 383 |
| 8 reps | 399 | 391 | 395 |
| 9 reps | 410 | 405 | 407 |
| 10 reps | 420 | 420 | 420 |
| 11 reps | 430 | 436 | 433 |
| 12 reps | 441 | 454 | 447 |
If 315 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 299 | 2 |
| 90% | 284 | 4 |
| 85% | 268 | 6 |
| 80% | 252 | 8 |
| 75% | 236 | 10 |
| 70% | 220 | 12 |
| 65% | 205 | 15 |
| 60% | 189 | 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 315 lb for 5 reps?
About 361 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 315 lb for 10 reps?
About 420 lb. Estimates get less precise above 10 reps.