One-rep max calculator
Put in a recent hard set. You get an estimated 1RM and the loads to use for any rep target, at the effort you want.
Your set
Log your sets in Fysiqal and your e1RM updates itself after every workout, with the same formula as this page.
Save this and track it free in Fysiqal →How this is calculated
Formula. Estimated 1RM = weight × (1 + reps ÷ 30), the Epley equation. A single counts as the weight itself. This is the same estimate Fysiqal uses for your strength history, PRs and starting loads.
RPE and reps in reserve. On the resistance-training RPE scale, RPE 10 means no reps left, RPE 9 one left, RPE 8 two left (RIR = 10 − RPE). A set of 5 at RPE 8 was worth about 7 reps to failure, so the estimate uses 7.
Limits. Prediction is most accurate with sets of 10 reps or fewer, best at 3–6. Higher-rep sets bring in muscular endurance, and equations tend to underestimate a true max. RPE is a skill: lifters misjudge reps in reserve by about one rep on average, more on high-rep sets. Other equations (Brzycki, Lombardi) give answers a few percent apart; pick one and stay consistent, which is why the app uses Epley everywhere.
Units. The default unit follows your region (lb in the US, kg elsewhere), as the app does. 1 lb = 0.45359237 kg.