1RM from 80 kg for 8 Reps
Lifting 80 kg for 8 reps gives an estimated 1RM of approximately 107 kg (Epley formula).
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 epley 1rm estimate and the full breakdown beneath it.
Estimate your one-rep max bench press or squat from a set of 8 reps at 80 kg.
Frequently asked questions
- When do Epley and Brzycki diverge most?
- At higher rep counts (8–10+), Brzycki tends to give a slightly lower estimate than Epley. For 1–5 reps, the difference is usually less than 5%. Use the average as a conservative estimate.
- Which formula should I use?
- Either is fine for most purposes. Epley is more widely cited; Brzycki is algebraically equivalent to the Lombardi formula. The best approach is to track your estimated 1RM over time using the same formula.