5 reps → 1RM
120lb
average estimate
8 reps → 1RM
132lb
10 reps → 1RM
140lb
3 reps → 1RM
113lb
Show the math
Epley (5 reps) = 105 lb × (1 + 5 ÷ 30) = 123 lb
Brzycki (5 reps) = 105 lb × 36 ÷ (37 − 5) = 118 lb
If you lifted 105 lb for…
| Reps | Epley | Brzycki | Average 1RM |
|---|---|---|---|
| 1 rep | 105 | 105 | 105 |
| 2 reps | 112 | 108 | 110 |
| 3 reps | 116 | 111 | 113 |
| 4 reps | 119 | 115 | 117 |
| 5 reps | 123 | 118 | 120 |
| 6 reps | 126 | 122 | 124 |
| 7 reps | 130 | 126 | 128 |
| 8 reps | 133 | 130 | 132 |
| 9 reps | 136 | 135 | 136 |
| 10 reps | 140 | 140 | 140 |
| 11 reps | 144 | 145 | 144 |
| 12 reps | 147 | 151 | 149 |
If 105 lb is your one rep max
| % of 1RM | Load (lb) | About this many reps |
|---|---|---|
| 95% | 100 | 2 |
| 90% | 94 | 4 |
| 85% | 89 | 6 |
| 80% | 84 | 8 |
| 75% | 79 | 10 |
| 70% | 74 | 12 |
| 65% | 68 | 15 |
| 60% | 63 | 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 105 lb for 5 reps?
About 120 lb, averaging the Epley and Brzycki formulas.
What is my 1RM if I lift 105 lb for 10 reps?
About 140 lb. Estimates get less precise above 10 reps.