One rep max calculator.
Enter a set you did, like 275 for 5, and get your estimated max, training percentages and rep maxes.
Estimated 1-rep max: 315 lb
Epley 321 lb · Brzycki 309 lb
| % | Weight |
|---|---|
| 95% | 300 lb |
| 90% | 285 lb |
| 85% | 270 lb |
| 80% | 250 lb |
| 75% | 235 lb |
| 70% | 220 lb |
| 65% | 205 lb |
| 60% | 190 lb |
| Reps | Weight |
|---|---|
| 1 | 315 lb |
| 2 | 300 lb |
| 3 | 290 lb |
| 4 | 285 lb |
| 5 | 275 lb |
| 6 | 265 lb |
| 8 | 250 lb |
| 10 | 235 lb |
Weights rounded to the nearest 5 lb.
How it works.
The calculator averages two formulas. Epley: max = weight × (1 + reps ÷ 30). Brzycki: max = weight × 36 ÷ (37 − reps). Both assume the set was taken close to failure, so a set with reps left in the tank will underestimate your max.
Use the percentages to plan your training sets, and the rep maxes to pick a weight for a target number of reps. Re-estimate every few weeks as you get stronger. In the Broward Strength Training Portal this happens automatically from every set you log.
Questions.
How accurate is a 1RM calculator?
It's an estimate. It's most accurate from sets of 2–6 reps taken close to failure, and less accurate past about 10 reps.
Which formula does this use?
The average of the Epley and Brzycki formulas, two of the most widely used. Both are shown so you can compare.
Should I test my real max?
Not often. Most lifters train well off an estimated max and test a true max before a meet or at the end of a training block.
What percentage should I train at?
It depends on the goal: roughly 70–80% for volume work, 80–90% for heavy sets of 2–5, and 90%+ for heavy singles. A coach adjusts this to how you're moving.
Want the numbers done for you?
Coached athletes get a program written by a Broward Strength coach in the Training Portal, with percentages and plate math worked out on every set and a countdown to meet day. $100/month, train anywhere.