Roulette’s betting table can look intimidating the first time you see it — a dense grid of numbers surrounded by rows of boxes marked with colors, ranges, and labels most people have never had explained to them. Underneath that visual complexity is a genuinely simple structure: every bet is just a choice about how narrowly or broadly you want to predict where the ball lands, and payouts scale directly with how precise that prediction is. This guide walks through the main bet types and the math connecting them, using the rules on our European roulette page as the reference.
The Wheel and Table Layout at a Glance
A European roulette wheel has 37 numbered pockets — 1 through 36 plus a single zero — and the betting table lays out the same numbers in a grid, surrounded by additional betting areas that group numbers by shared properties like color, range, or parity. Betting directly on the numbered grid is called an “inside bet,” while betting on the surrounding grouped areas is called an “outside bet.” That inside/outside split is the main organizing concept for understanding the whole table.
Inside Bets: Straight Up, Split, Street, Corner
A straight-up bet covers a single number and pays the highest odds on the table, precisely because hitting one specific number out of 37 is the least likely outcome available. A split bet covers two adjacent numbers by placing a chip on the line between them, roughly doubling your chance of winning compared to a straight-up bet while roughly halving the payout. Street bets cover a row of three numbers, and corner bets cover four numbers meeting at a shared corner on the grid — each step outward covers more numbers, raises your win probability, and proportionally lowers the payout. This scaling pattern continues through every inside bet type on the table.
Outside Bets: Red/Black, Odd/Even, Dozens, Columns
Outside bets trade precision for coverage. Red/black and odd/even bets each cover roughly half the numbers on the wheel, offering close to even-money payouts with correspondingly frequent, smaller wins. Dozens (grouping numbers 1–12, 13–24, or 25–36) and columns (grouping numbers by their vertical position on the grid) each cover roughly a third of the numbers, sitting in the middle of the risk-reward spectrum between the near-coin-flip outside bets and the long-shot inside bets. None of these groupings changes the underlying odds of the wheel — they simply repackage the same 37 possible outcomes into different-sized buckets.
Why Every Bet on the Table Has the Same House Edge
This is the part that surprises a lot of new players: despite wildly different payout odds, every standard bet on a European roulette table carries the same house edge, built in through the presence of the single zero pocket. A straight-up bet’s higher payout is mathematically balanced against its much lower win probability, and a red/black bet’s near-50% win chance is balanced against its close-to-even payout — both land on the same long-run edge for the house. Choosing between bet types is really a choice about variance and session pacing, not a choice about which bet is “better value,” because none of them is.
Single Zero vs Double Zero: Why It Matters
The presence of the zero pocket (or pockets) is what creates the house edge in roulette in the first place — without it, red/black and similar even-money bets would be a true 50/50 proposition. A European wheel’s single zero gives the house a smaller structural edge than a wheel carrying both a single zero and a double zero, since an extra non-red, non-black pocket increases how often outside bets lose without changing their payout. This is a straightforward mathematical consequence of adding one more losing pocket to the wheel, and it’s why a single-zero wheel is generally considered the more favorable version of the game for players, all else being equal.
Choosing Bets Based on Your Session Style
If you want a session with frequent, smaller swings and don’t mind the outcome staying close to a coin-flip pattern, outside bets like red/black or odd/even deliver that rhythm. If you’re comfortable with longer dry stretches in exchange for a much larger payout on the rare occasions you hit, straight-up or split bets deliver that instead — similar in spirit to choosing a high-volatility slot in our volatility guide. Many players mix bet types within a single spin, covering some numbers directly while also placing a broader outside bet, which shapes the overall variance of that spin without changing the underlying house edge on any individual bet.
The Responsible Play Reminder
No combination of inside and outside bets changes the wheel’s built-in house edge, and no betting pattern — covering more numbers, chasing a color streak, or increasing stakes after a loss — improves your long-run odds beyond what a single straight-up bet already reflects. Set a session budget before sitting down at a table in our table games hub or browsing our casino rankings, treat each spin as independent of the ones before it, and use deposit or time limits if a session runs longer than you intended.
