Lyfta Tools
1RM Calculator
Enter the weight you lifted and how many reps you hit to estimate your one rep max.
Your lift
Enter a set you could do with good form — a 2–10 rep set gives the most accurate estimate.
kg
reps
1RM = w × (1 + reps ÷ 30) — Widely used and robust across typical rep ranges. A solid default.
Estimated one rep max
116.5kg
Based on Epley (1985) — 100.0 kg × 5 reps
Training loads
Based on Epley| Reps | Weight (kg) | % of 1RM |
|---|---|---|
| 11RM | 116.5 | 100% |
| 2 | 109.5 | 94% |
| 3 | 106.0 | 91% |
| 4 | 103.0 | 88% |
| 5 | 100.0 | 86% |
| 6 | 97.0 | 83% |
| 8 | 92.0 | 79% |
| 10 | 87.5 | 75% |
| 12 | 83.5 | 71% |
These are estimates — actual performance varies with fatigue, technique, and exercise. Always use a spotter or safety equipment when testing near-maximal loads.
Track your real lifts with Lyfta
Log every set and let Lyfta track your estimated 1RM over time — across every exercise in your routine.