How much could you lift just once? Enter a set you actually did and get your estimated max — then the loads to use for each rep count.
Three published formulas, applied as-is: Epley, Brzycki and Lombardi. They disagree with each other — that is expected: they are statistical estimates, not a measurement. The only true 1RM is the one you actually lift.
Enter a weight and a rep count to see the result.