One Rep Max Calculator
Calculate your one rep max using multiple proven formulas
Enter Your Lift
The weight you lifted for the reps below
Number of reps completed (1-30)
1RM Results by Formula
Average 1RM
114.3 kg
Recommended value
Brzycki
112.5 kg
Most accurate for 1-10 reps
Epley
116.7 kg
Traditional formula
Lander
113.7 kg
Conservative estimate
Training Percentages
| % 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.
Your Estimated 1RM
114.3
kg
Input Weight100 kg
Reps5
About 1RM Formulas
Brzycki Formula
Most accurate for sets of 1-10 reps. Widely used in strength training programs.
Epley Formula
Traditional formula that works well across rep ranges. Slightly higher estimates.
Lander Formula
Tends to give more conservative estimates. Good for beginners.
Safety Note
These are estimates only. Always use a spotter when attempting heavy lifts, and never test your true 1RM without proper preparation and safety measures.