What Is My 1RM If I Bench Press 100 kg for 5 Reps?
Lifting 100 kg for 5 reps gives an estimated one-rep max of approximately 113 kg.
How to use this tool
- Enter weight lifted and reps performed in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your estimated 1rm and the full breakdown beneath it.
Calculate your estimated bench press one-rep max when you can lift 100 kg for 5 repetitions.
Frequently asked questions
- What is the Epley formula?
- Epley 1RM = weight × (1 + reps ÷ 30). It is one of several accepted formulas; accuracy decreases for sets above 10 reps.
- Is the estimated 1RM accurate?
- It is an estimate. Studies show Epley is accurate to within ~5% for sets of 1–10 reps. For very high rep sets (15+) accuracy drops — use sets of 3–8 for best results.