If we put this fraction in to a calculator we get 0.48648, which is roughly 48.7%.

In other words, there are a total of 37 numbers on the roulette wheel, and 18 of them are red, so we will win 18/37 times. If you want to work out the probability of winning when betting on the red numbers, you can use a simple fraction like this: 18/37 = 0.48648 What's the probability of winning on one spin? I'm mostly going to be working out the probability of winning when betting on red (an even-money bet) on a European roulette table (the one with a single green 0), but you can use the same mathematics for working out the probabilities of winning with any bet on any table. Then there's some interesting statistics at the end: What's the probability of winning and losing in any order? (most practical).What's the probability of winning and losing in a specific order?.What's the probability of winning on any spin?.What's the probability of winning on multiple spins?.What's the probability of winning on one spin?.I'll start with working out some useful probabilities: In this article I'm going to give you a simplified introduction to the mathematics of roulette. How to work out different probabilities in roulette

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