Winning at online roulette is largely a matter of luck, as the outcome of the game is determined by a random number generator. However, players can increase their chances of winning by understanding the rules of the game, using betting strategies and effective money management.
You can get the best results by combining betting systems with even money bets. There is no secret formula for Roulette. There are specific approaches you can try to get a rough estimate of a range of numbers, but there is absolutely no way to predict the outcome accurately using any particular Roulette formula.