Epley formula
1RM = weight × (1 + reps ÷ 30)
Your one-rep max is the heaviest you could lift for a single clean rep. Estimates are most accurate at 10 reps or fewer — accuracy drops as reps rise. We average two established formulas (Epley and Brzycki) for a reliable figure, then give you working percentages for programming.
Estimating your one-rep max
Testing a true 1RM is risky, so lifters estimate it from a multi-rep set. Enter a weight (in kg or lb) and reps (ideally 3–8 for accuracy); the tool averages the Epley and Brzycki formulas, then builds a percentage table for training loads.
Estimates get less accurate above ~10 reps — use a heavier set for the best result.