Estimate your max lift in seconds — with a full rep table
Lift Details
Your Estimated 1RM
Rep-Max Percentage Table
Based on your estimated 1RM of 114.6 kg
| Reps | % of 1RM | Weight (kg) |
|---|---|---|
| 1 | 100% | 114.6 |
| 2 | 95% | 108.9 |
| 3 | 93% | 106.6 |
| 4 | 90% | 103.1 |
| 5your set | 87% | 99.7 |
| 6 | 85% | 97.4 |
| 7 | 83% | 95.1 |
| 8 | 80% | 91.7 |
| 9 | 77% | 88.2 |
| 10 | 75% | 85.9 |
| 12 | 70% | 80.2 |
| 15 | 65% | 74.5 |
| 20 | 60% | 68.8 |
Note: 1RM estimates are mathematical approximations and are most accurate for sets of 1–10 reps. Actual 1RM varies by individual, training state, exercise, and technique. Always warm up thoroughly and use a spotter when attempting near-maximal lifts.
The one rep max (1RM) calculator estimates the maximum weight you can lift for a single repetition based on a submaximal set. Using the industry-standard Epley and Brzycki formulas, simply enter the weight you lifted and how many reps you completed. You'll instantly get your estimated 1RM plus a full percentage-based rep table to plan every training session.
Both are widely used and perform similarly for sets of 1–6 reps. Epley tends to predict slightly higher values at higher rep counts, while Brzycki is often considered more conservative. Using the average of both gives a balanced estimate for most lifters.
The most accurate estimates come from sets of 1–5 reps at a heavy effort level (RPE 8–10). As rep count increases beyond 10, the formulas become less reliable because fatigue and muscular endurance play a larger role relative to raw strength.
Yes — the Epley and Brzycki formulas work for any barbell or dumbbell exercise, including squat, bench press, deadlift, and overhead press. However, accuracy varies by exercise; compound lifts with consistent technique tend to produce the most reliable estimates.
The percentage table shows how much weight corresponds to different rep ranges relative to your 1RM. Strength coaches use it to program training loads — for example, sets of 5 at ~87% for strength, or sets of 10 at ~75% for hypertrophy.