5 reps → 1RM
418lb
average estimate
8 reps → 1RM
458lb
10 reps → 1RM
487lb
3 reps → 1RM
394lb
Show the math
Epley (5 reps) = 365 lb × (1 + 5 ÷ 30) = 426 lb
Brzycki (5 reps) = 365 lb × 36 ÷ (37 − 5) = 411 lb
If you lifted 365 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 365 | 365 | 365 |
| 2 reps | 389 | 375 | 382 |
| 3 reps | 402 | 386 | 394 |
| 4 reps | 414 | 398 | 406 |
| 5 reps | 426 | 411 | 418 |
| 6 reps | 438 | 424 | 431 |
| 7 reps | 450 | 438 | 444 |
| 8 reps | 462 | 453 | 458 |
| 9 reps | 474 | 469 | 472 |
| 10 reps | 487 | 487 | 487 |
| 11 reps | 499 | 505 | 502 |
| 12 reps | 511 | 526 | 518 |
If 365 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 347 | 2 |
| 90% | 328 | 4 |
| 85% | 310 | 6 |
| 80% | 292 | 8 |
| 75% | 274 | 10 |
| 70% | 256 | 12 |
| 65% | 237 | 15 |
| 60% | 219 | 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.
Want a clinician to look at these numbers?We know licensed clinicians in every state. If you ask, one can reach out to you. Get matched
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 365 lb for 5 reps?
About 418 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 365 lb for 10 reps?
About 487 lb. Estimates get less precise above 10 reps.