Menu
Telegram

How To Calculate Probability in Roulette - Best Advices

  • Written by Martina Maritato
How To Calculate Probability in Roulette - Best Advices
Here at Bet and Skill we love a spin of the roulette wheel and know all there is to know about the popular casino game. Wanna know how to calculate probability in roulette? Below you’ll find our top tips on how to calculate your chances and win at the roulette table.


Roulette is very simple game to understand. You place a bet on where you think the ball will land and if it does, you win!

Of course, the chances of the ball landing on where you’ve placed your chips can vary dramatically from a one in 37 chance to a 50% chance. But how do you calculate this probability.

The Roulette Table 

roulette-table

Let’s start with the table itself. On a roulette wheel there are either 37 or 38 numbers depending on whether you’re playing American or European Roulette. The numbers range from zero to 36, with a 00 on the American wheel.

The American Wheel has an extra edge to the casino so it’s always worth playing European.

Across the table you’ll find every number as well as a number of Outside bets. These are the spots where you can bet on Odds and Evens, Red or Black and various lines and sections of the table.

You’ll find 18 red numbers and 18 black giving an even chance of the ball landing on red or black. Equally, you’ll find the same number of odd numbers and even.

The zero, and double zero, stand alone and basically unless you bet on it gives the house the edge.

You can place bets on any number as well as many other variants including four numbers (corner bet), such as has been done in the image above with 22, 23, 25 and 26.


Top 5 Roulette Casino Sites
  • 5/5William Hill Casino - £10 FREE Welcome Bonus
    Absolutely NO DEPOSIT required
    18+. Play Safe. From 09:00 on 10.10.22 New customers only. Selected games only. Wagering requirements apply. Max £10 bonus expires 72 hours from issue. Max £25 redeemable winnings. Customer verification may require deposit. Further terms apply..
    The Bonus Drop: win up to £1000 100% Buy-In Bonus up to £300 Megaways Slots Quantum Roulette Quantum Blackjack£10NDClaim
  • 4.5/5Ladbrokes Casino - Stake £10 get £30 bonus
    No deposit free spins every day with Instant Spins & Trivia Showdown
    #ad 18+.New Casino players only. Deposit required. Play €10+ on qualifying games. 40x wager reqs (Bonus only) on selected games. Accept Bonus within 14 days. Bonus valid for 30 days. Certain deposit types excluded. Player restrictions and T&Cs apply. pleas gamble responsibly.
    Daily free spins with Instant SpinsGame shows (eg. Deal or No Deal Live)Daily Jackpots£2 Million Giveaway Megaways slots£30Claim
  • 4.5/5Betfred Casino - Stake £10, Play With 200 Free Spins
    No wagering requirements!
    Winnings paid as cash!
    #ad New customers only. Opt In required. £/€10 min stake on Casino slots within 30 days of registration. Max bonus 200 Free Spins on selected games credited within 48 hours. Free Spins expire after 7 days. iOS app restrictions may apply. Email/SMS validation may apply. Not available in NI. Full T&Cs apply.
    Exclusive Live Casino Weekly Free Spins Accumulator Must Drop JackpotsAge Of The Gods slotsKingdom Rise slots 200FSClaim
  • 3/5Netbet Casino - 20 Free Spins No Deposit on Starburst
    Use bonus code: SKILL
    + 500 Free Spins on your first deposit!
    New players, £10+ deposit, no e-wallets/prepaid cards, 50x wagering on Vegas Free Spins, 40x wagering on Casino Free Spins. 18+ T&Cs apply
    Over 1000 Casino GamesLive Blackjack & Live Roulette Age Of The Gods & Kingdoms Rise slots Powerplay Jackpot slotsEarn Rewards with Players Club20FSClaim





Roulette Table Probabilities
The probabilities vary when it comes to betting on the roulette table.

Betting on Outside Bets will give you a higher chance of winning although does also have a lower payout.

With Outside Bets you’ll usually have around a one in two or one in three chance of winning. These are the following:

Odds/Evens: 48.65% chance of winning. Pays out even money.

Red/Black: 48.65% chance of winning. Pays out even money.

1-18/19-36: 48.65% chance of winning. Pays out even money.

Because the chance of winning is 18/37, this gives you almost a 50% chance of winning your bet by placing these outside bets.

Other Outside Bets and their payouts include:

Column: 32.4% chance of winning. Pays out 2/1.

Dozen: 32.4% chance of winning. Pays out 2/1.

Inside bets have much longer odds as the percentages can be as large as a one in 37 shot.

Below you’ll find some of the more common inside bets and their odds and payout:

One Number: 2.7% chance of winning. Pays out 35/1.

Split: 5.4% chance of winning. Pays out 17/1.

Street: 8.1% chance of winning. Pays out 11/1.

Corner: 10.8% chance of winning. Pays out 8/1.

Six Line: 16.2% chance of winning. Pays out 5/1.



Calculating Probabilities
Calculating probabilities in roulette is relatively easy and simply involves using the fraction and dividing and multiplying accordingly. It’s basic school mathematics.

So for example, let’s say you wanted to place a bet on red you would use the following formula:

(18/37) x 100

This would give you the percentage chance of you winning. There are 18 reds out of 37 numbers on the table which gives a decimal of 0.4865. Multiply that by 100 to gain the percentage and it’s 48.65%.

You can do this with any probability on a roulette wheel. However, when it comes to working out sequences it’s a little more complex.

Let’s say you wanted to work out the chance of the ball landing on red twice in a row. To work out that you would need to use the following formula:

(18/37 x 18/37) x 100

This would work out at around a 24% chance of happening and ultimately just involved multiplying the fractional odds with each other, and then multiplying by 100 to get the percentage.

You can do this as many times as you want and can forecast a sequence as long as you need to work out the chances of that particular sequence winning.

Where Can I Put Probabilities Into Practice?  

Naturally, once you’ve worked out the probabilities of the roulette table you’re going to want to put into action.

There are dozens of fantastic online casinos to play roulette with, many offering free spins to get started.

Head over to our online casinos page to find all the very best casinos to play roulette with and get in depth reviews on their gameplay and casino promotions.

SHARE IT WITH YOUR FRIENDS
Let your friends know about this article! Share it on your favourite social media!



Sections
Follow Us

Any questions?
Please contact us at:
info [@] betandskill.com
.
Take Time To Thinkbegambleaware

BeGambleAware.org and Remote Gambling aim to promote responsibility in gambling. They provide information to help you make informed decisions about your gambling.

Problem gambling? Call the National Gambling Helpline: freephone 0808 8020 133 8am to midnight, 7 days a week.

We are committed to responsible gambling and have a number of ways to help you stay in control and keep gambling fun.


18+
You must be 18 years old or over to use this site. Please bet responsibly.