Roulette Bets Explained: Inside, Outside, and What Each One Pays

What are the two families of roulette bets?

Roulette wagers divide into inside bets, placed directly on the numbered grid, and outside bets, placed on the categories bordering it. The split determines how often a bet wins and how large its payout is when it does, but not the underlying cost of playing.

Inside bets sit on the grid itself: single digits, or clusters formed by placing a chip on the line between numbers. Outside bets sit in the surrounding boxes: color, parity, range, dozen, or column. The wheel makes no distinction between the two; every number, zero included, carries the identical chance on any single spin. The bet only shapes how that chance is packaged, as one narrow shot at a large payout or a wide net that wins often for a small one.

What does each inside bet pay?

Inside bets pay in proportion to how many numbers they cover, from a single straight up number at 35 to 1 down to a six-number line at 5 to 1. The American-only five-number bet breaks that pattern, paying worse than its true odds justify.

These payouts are identical on European and American wheels; a straight-up number pays 35 to 1 either way. What changes is the true odds behind that payout, covered next. The five-number bet is the exception worth flagging: it does not divide evenly into the wheel's groupings, so it carries a larger edge than anything else on the layout.

• Straight up (1 number): 35 to 1
• Split (2 numbers): 17 to 1
• Street (3 numbers): 11 to 1
• Corner, or square (4 numbers): 8 to 1
• Line, or six-line (6 numbers): 5 to 1
• Five-number bet, American wheels only (0, 00, 1, 2, 3): 6 to 1, carrying a 7.89% edge, the worst bet on the table

What does each outside bet pay?

Outside bets group into even-money wagers, red/black, odd/even, and high/low, each paying 1 to 1, and wider wagers, dozens and columns, each covering 12 numbers and paying 2 to 1.

Outside bets are lower variance by design: they cover roughly half or a third of the layout, so they win far more often than a single number, for a proportionally smaller return. A red/black bet wins close to half the time; a dozens bet wins close to a third. That frequency can feel safer and smooths a bankroll's swings, but it carries the same underlying cost per spin as any inside bet.

• Red or black: 1 to 1
• Odd or even: 1 to 1
• Low (1-18) or high (19-36): 1 to 1
• Dozens (1-12, 13-24, 25-36): 2 to 1
• Columns, three vertical lines of 12 numbers: 2 to 1

Where does the house edge actually come from?

The edge lives in the gap between a bet's true odds and its posted payout. A straight-up number on a European wheel has 36 to 1 true odds against it, but the house pays only 35 to 1. That single-unit shortfall repeats across every bet on the table.

A European wheel has 37 pockets (1 through 36 plus a single zero). A break-even payout for a one-number bet would be 36 to 1: across 37 spins, the bet wins once and should collect 36 units to offset the 36 losses. The house pays 35 to 1 instead, one unit short. Expressed as a percentage of every wager, that single-unit gap produces the same 2.70% figure whether the bet is a straight-up number, a dozen, or a coin-flip color, because every payout on the table is built with the identical shortfall relative to its true odds.

One unit short, repeated on every bet on the table.

How much does the house edge cost per 100 staked?

On a European wheel, the house edge is 2.70%, about 2.7 ENT per 100 staked, on nearly every bet. On an American wheel, the extra 00 pocket pushes that to 5.26%, about 5.26 ENT per 100 staked, roughly double.

The difference comes down to one extra pocket. Adding a 00 does not change any posted payout, a straight-up number still pays 35 to 1, but it changes the true odds, since 38 pockets now compete for that same payout instead of 37. The house edge is the built-in percentage of total wagers the game is mathematically expected to retain over time. It is not a per-spin certainty; any single session can run well above or below it, but across enough spins the result converges toward the posted figure.

What do la partage and en prison change?

Both rules apply only to the even-money outside bets on a European wheel and soften what happens on zero. La partage returns half the stake immediately; en prison holds the full stake for one more spin. Either version cuts the even-money edge to about 1.35%.

Without either rule, a zero sends the full even-money stake to the house, same as any other loss. Both rules exist to make red/black, odd/even, and high/low less punishing on that single outcome, roughly halving their edge. Inside bets and the 2-to-1 dozens and columns are unaffected; the discount is narrow and applies only where a casino chooses to offer it.

Does bet variance change the house edge?

No. Inside bets are higher variance, rare wins with large payouts, while outside bets are lower variance, frequent wins with small ones. The underlying cost per unit wagered is the same wheel-wide figure regardless of which style is chosen.

Variance describes the shape of a bankroll's swings, not the size of the house's cut. A player betting single numbers all night sees long dry stretches punctuated by large payouts; a player betting red every spin sees a smoother stream of small wins and losses. Over a long enough sample, both are expected to lose the same 2.70% or 5.26% of everything wagered. The choice changes a session's texture, not its expected outcome.

Does any pattern of bets or wheel history overcome the edge?

No. Every spin is independent of the ones before it; the wheel has no memory. No sequence of bet sizes, colors, or 'due' numbers alters the odds of the next spin or the wheel-wide house edge.

A run of six reds can feel like evidence that black is 'due,' but the wheel keeps no record of what already happened; the odds on the next spin match the odds on the first spin of the night. Betting progressions change how quickly a bankroll rises or falls and how large a single result might be, but they never touch the percentage the house is positioned to keep.

The wheel has no memory; the edge does not fade with time.