5 reps → 1RM
315lb
average estimate
8 reps → 1RM
345lb
10 reps → 1RM
367lb
3 reps → 1RM
297lb
Show the math
Epley (5 reps) = 275 lb × (1 + 5 ÷ 30) = 321 lb
Brzycki (5 reps) = 275 lb × 36 ÷ (37 − 5) = 309 lb
If you lifted 275 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 275 | 275 | 275 |
| 2 reps | 293 | 283 | 288 |
| 3 reps | 302 | 291 | 297 |
| 4 reps | 312 | 300 | 306 |
| 5 reps | 321 | 309 | 315 |
| 6 reps | 330 | 319 | 325 |
| 7 reps | 339 | 330 | 335 |
| 8 reps | 348 | 341 | 345 |
| 9 reps | 358 | 354 | 356 |
| 10 reps | 367 | 367 | 367 |
| 11 reps | 376 | 381 | 378 |
| 12 reps | 385 | 396 | 390 |
If 275 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 261 | 2 |
| 90% | 248 | 4 |
| 85% | 234 | 6 |
| 80% | 220 | 8 |
| 75% | 206 | 10 |
| 70% | 192 | 12 |
| 65% | 179 | 15 |
| 60% | 165 | 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 275 lb for 5 reps?
About 315 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 275 lb for 10 reps?
About 367 lb. Estimates get less precise above 10 reps.