Calculate your one rep max using multiple proven formulas
The weight you lifted for the reps below
Number of reps completed (1-30)
| % of 1RM | Weight (kg) | Est. Reps |
|---|---|---|
| 100% | 114.3 | 1 (max) |
| 95% | 108.6 | ~2 |
| 90% | 102.9 | ~4 |
| 85% | 97.1 | ~6 |
| 80% | 91.4 | ~8 |
| 75% | 85.7 | ~10 |
| 70% | 80.0 | ~12 |
| 65% | 74.3 | ~15 |
| 60% | 68.6 | ~18 |
| 55% | 62.9 | ~22 |
| 50% | 57.1 | ~25 |
Estimated reps are approximations. Individual performance may vary based on training experience, fatigue, and exercise type.
Most accurate for sets of 1-10 reps. Widely used in strength training programs.
Traditional formula that works well across rep ranges. Slightly higher estimates.
Tends to give more conservative estimates. Good for beginners.
These are estimates only. Always use a spotter when attempting heavy lifts, and never test your true 1RM without proper preparation and safety measures.