Calcvers
One Rep Max Calculator
Training
Generated
September 24, 2026
Estimated 1 Rep Max
115kg
From 100 kg × 5 reps
Your inputs
- Weight lifted
- 100 kg
- Reps performed
- 5 reps
Breakdown
- 95% (2–3 reps)
- 110 kg
- 80% (7–8 reps)
- 92.5 kg
- 70% (11–12 reps)
- 80 kg
Training percentages
| Item | Value |
|---|---|
| 100% · 1 rep | 115 kg |
| 95% · 2–3 reps | 110 kg |
| 90% · 3–4 reps | 102.5 kg |
| 85% · 5–6 reps | 97.5 kg |
| 80% · 7–8 reps | 92.5 kg |
| 75% · 9–10 reps | 85 kg |
| 70% · 11–12 reps | 80 kg |
What this means
Your one-rep max (1RM) is the most weight you can lift for a single repetition. Rather than testing a true max (which is fatiguing and risky), we estimate it from a submaximal set using validated formulas, then derive the training percentages used to program strength work.
Recommendations
- Build strength in the 80–95% range (2–6 reps); build muscle in the 65–80% range (8–12 reps).
- Re-test your estimate every 4–6 weeks by logging a heavy set of 3–5 reps.
Watch out
- Estimates lose accuracy above ~8 reps as endurance and technique start to dominate.
- Always warm up thoroughly and use a spotter or safeties before attempting near-maximal lifts.