Ultimate Roulette Calculator is created for use with a selection of online roulette. It will calculate what to bet on next based on what has been previously spun. Enter the last number the roulette wheel landed on and click the calculate next bet button. The Roulette Calculator will then show you what to bet on next based on the odds. New algorithm has been used to calculate the bets. Version 2 fixed button background color error in XP.