5 reps → 1RM
292lb
average estimate
8 reps → 1RM
320lb
10 reps → 1RM
340lb
3 reps → 1RM
275lb
Show the math
Epley (5 reps) = 255 lb × (1 + 5 ÷ 30) = 298 lb
Brzycki (5 reps) = 255 lb × 36 ÷ (37 − 5) = 287 lb
If you lifted 255 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 255 | 255 | 255 |
| 2 reps | 272 | 262 | 267 |
| 3 reps | 280 | 270 | 275 |
| 4 reps | 289 | 278 | 284 |
| 5 reps | 298 | 287 | 292 |
| 6 reps | 306 | 296 | 301 |
| 7 reps | 314 | 306 | 310 |
| 8 reps | 323 | 317 | 320 |
| 9 reps | 332 | 328 | 330 |
| 10 reps | 340 | 340 | 340 |
| 11 reps | 348 | 353 | 351 |
| 12 reps | 357 | 367 | 362 |
If 255 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 242 | 2 |
| 90% | 230 | 4 |
| 85% | 217 | 6 |
| 80% | 204 | 8 |
| 75% | 191 | 10 |
| 70% | 178 | 12 |
| 65% | 166 | 15 |
| 60% | 153 | 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 255 lb for 5 reps?
About 292 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 255 lb for 10 reps?
About 340 lb. Estimates get less precise above 10 reps.