5 reps → 1RM
143lb
average estimate
8 reps → 1RM
157lb
10 reps → 1RM
167lb
3 reps → 1RM
135lb
Show the math
Epley (5 reps) = 125 lb × (1 + 5 ÷ 30) = 146 lb
Brzycki (5 reps) = 125 lb × 36 ÷ (37 − 5) = 141 lb
If you lifted 125 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 125 | 125 | 125 |
| 2 reps | 133 | 129 | 131 |
| 3 reps | 138 | 132 | 135 |
| 4 reps | 142 | 136 | 139 |
| 5 reps | 146 | 141 | 143 |
| 6 reps | 150 | 145 | 148 |
| 7 reps | 154 | 150 | 152 |
| 8 reps | 158 | 155 | 157 |
| 9 reps | 162 | 161 | 162 |
| 10 reps | 167 | 167 | 167 |
| 11 reps | 171 | 173 | 172 |
| 12 reps | 175 | 180 | 178 |
If 125 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 119 | 2 |
| 90% | 112 | 4 |
| 85% | 106 | 6 |
| 80% | 100 | 8 |
| 75% | 94 | 10 |
| 70% | 88 | 12 |
| 65% | 81 | 15 |
| 60% | 75 | 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 125 lb for 5 reps?
About 143 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 125 lb for 10 reps?
About 167 lb. Estimates get less precise above 10 reps.