5 reps → 1RM
178lb
average estimate
8 reps → 1RM
194lb
10 reps → 1RM
207lb
3 reps → 1RM
167lb
Show the math
Epley (5 reps) = 155 lb × (1 + 5 ÷ 30) = 181 lb
Brzycki (5 reps) = 155 lb × 36 ÷ (37 − 5) = 174 lb
If you lifted 155 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 155 | 155 | 155 |
| 2 reps | 165 | 159 | 162 |
| 3 reps | 170 | 164 | 167 |
| 4 reps | 176 | 169 | 172 |
| 5 reps | 181 | 174 | 178 |
| 6 reps | 186 | 180 | 183 |
| 7 reps | 191 | 186 | 189 |
| 8 reps | 196 | 192 | 194 |
| 9 reps | 202 | 199 | 200 |
| 10 reps | 207 | 207 | 207 |
| 11 reps | 212 | 215 | 213 |
| 12 reps | 217 | 223 | 220 |
If 155 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 147 | 2 |
| 90% | 140 | 4 |
| 85% | 132 | 6 |
| 80% | 124 | 8 |
| 75% | 116 | 10 |
| 70% | 108 | 12 |
| 65% | 101 | 15 |
| 60% | 93 | 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 155 lb for 5 reps?
About 178 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 155 lb for 10 reps?
About 207 lb. Estimates get less precise above 10 reps.