Stone Cutting Calculator Lost Ark . This calculator shows the maximum probability of achieving a completed stone that satisfies all chosen minimum and maximum values. The client app servers a user facing interface to present the simulation. Reset ilo from ewly.beegeescover.pl This calculator shows the maximum probability of achieving a completed stone that satisfies all chosen minimum and maximum values. Lost ark calculator stone maxroll calculator says it takes on average 602 leapstones to get through 1340 to 1370 with average luck with books used optimally, and 800 with no books used. Click the faceting buttons on the right (like in game) until the stone matches yours, make sure the success rate also matches, and then click start to begin calculating probabilities.