Free tool
One rep max calculator
Put in any set and get your estimated one-rep max, a rep max table and percentages. It uses the same formula the Evident app uses to track and rank your lifts.
Your numbers, any set
Rep maxes
| Reps | Weight |
|---|---|
| 1 | 21095 |
| 2 | 20093 |
| 3 | 19590 |
| 4 | 19088 |
| 5 | 18585 |
| 6 | 18083 |
| 7 | 17580 |
| 8 | 17078 |
| 9 | 16575 |
| 10 | 16073 |
| 11 | 16073 |
| 12 | 15570 |
Percent of max
| % | Weight | Reps |
|---|---|---|
| 100% | 21598 | 1 |
| 95% | 20593 | 1 |
| 90% | 19588 | 3 |
| 85% | 18583 | 5 |
| 80% | 17578 | 7 |
| 75% | 16073 | 9 |
| 70% | 15068 | 12 |
| 65% | 14063 | 16 |
| 60% | 13058 | 20 |
Weights rounded to 5 lb (2.5 kg). Reps are what the formula says you could do at that weight, one all-out set.
Never do the math again.
Evident tracks your max on every lift, tells you what to lift each set, and raises the weight when you earn it.
Free to download. 7-day free trial.
Questions
One rep max questions.
How do I calculate my one rep max?
Take a hard set you finished with good form and put the weight and reps into the calculator. Evident uses the Epley formula: weight × (1 + reps ÷ 30). A set of 5 at 185 lb works out to about a 216 lb max.
How accurate is a one rep max calculator?
It is an estimate. It is closest when the set is heavy, somewhere between 2 and 10 reps. Past about 10 reps, every formula gets rougher, so use a heavier set when you can.
Epley or Brzycki: which formula is better?
They agree at 10 reps and stay close below it. Brzycki (weight × 36 ÷ (37 − reps)) reads a little lower on short sets. Evident uses Epley everywhere, so the calculator matches how the app tracks and ranks your lifts.
What percentage of my max can I lift for 5 reps?
By the Epley formula, a set of 5 all-out reps sits at about 86% of your one-rep max, a set of 8 at about 79% and a set of 10 at 75%. The percent table above shows the weights for your max.
What can I do with my one rep max?
Use the tables to pick a weight for a set of any length, or rank the lift against strength standards for your bodyweight. The rank link above opens the calculator for that lift with your set filled in.