5 reps → 1RM
430lb
average estimate
8 reps → 1RM
470lb
10 reps → 1RM
500lb
3 reps → 1RM
405lb
Show the math
Epley (5 reps) = 375 lb × (1 + 5 ÷ 30) = 438 lb
Brzycki (5 reps) = 375 lb × 36 ÷ (37 − 5) = 422 lb
If you lifted 375 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 375 | 375 | 375 |
| 2 reps | 400 | 386 | 393 |
| 3 reps | 413 | 397 | 405 |
| 4 reps | 425 | 409 | 417 |
| 5 reps | 438 | 422 | 430 |
| 6 reps | 450 | 435 | 443 |
| 7 reps | 462 | 450 | 456 |
| 8 reps | 475 | 466 | 470 |
| 9 reps | 488 | 482 | 485 |
| 10 reps | 500 | 500 | 500 |
| 11 reps | 512 | 519 | 516 |
| 12 reps | 525 | 540 | 532 |
If 375 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 356 | 2 |
| 90% | 338 | 4 |
| 85% | 319 | 6 |
| 80% | 300 | 8 |
| 75% | 281 | 10 |
| 70% | 262 | 12 |
| 65% | 244 | 15 |
| 60% | 225 | 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 375 lb for 5 reps?
About 430 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 375 lb for 10 reps?
About 500 lb. Estimates get less precise above 10 reps.