Inside roulette bets cover individual numbers or small groups on the numbered grid. Outside bets cover broad categories such as red, black, odd, even, high, low, dozens, and columns.
On the same standard wheel, most of these wagers carry the same house edge. The central choice is usually not price but distribution: inside bets win less often and pay more; outside bets win more often and pay less.
There are important exceptions. The American first-five bet has a worse edge than most other double-zero wagers, while special rules such as La Partage or En Prison can improve selected even-money outside bets when they are actually offered.
What belongs in each group
| Family | Standard bets | Numbers covered | Typical payout |
|---|---|---|---|
| Inside | Straight-up | 1 | 35 to 1 |
| Inside | Split | 2 | 17 to 1 |
| Inside | Street | 3 | 11 to 1 |
| Inside | Corner | 4 | 8 to 1 |
| Inside | Six-line | 6 | 5 to 1 |
| Outside | Dozen or column | 12 | 2 to 1 |
| Outside | Red/black, odd/even, 1-18/19-36 | 18 | 1 to 1 |
The physical layout creates the names. Chips on or around numbered boxes are inside bets. Chips in the larger labeled areas outside the grid are outside bets.
The category does not tell you how much money is on the spin. Five $5 inside chips create a $25 total wager. One $25 chip on red also creates a $25 total wager. Compare total exposure, not just the number of chips.
Single-zero probabilities
A European-style single-zero wheel has 37 pockets. The following standard bets all produce the same 2.7027% house edge even though their hit rates differ sharply.
| Bet | Winning pockets | Hit probability | Profit payout | Expected loss on $10 |
|---|---|---|---|---|
| Straight-up | 1 | 2.7027% | $350 | $0.2703 |
| Six-line | 6 | 16.2162% | $50 | $0.2703 |
| Dozen | 12 | 32.4324% | $20 | $0.2703 |
| Red | 18 | 48.6486% | $10 | $0.2703 |
For a $10 red wager:
EV = (18/37 × $10) − (19/37 × $10) = −$0.2703
For a $10 straight-up wager:
EV = (1/37 × $350) − (36/37 × $10) = −$0.2703
Equal expected loss does not mean equal experience. The red wager produces many more winning spins and small net movements. The straight-up wager normally loses, then occasionally produces a large payment.
Double-zero changes the price, not the comparison
A standard American wheel adds 00, giving 38 pockets. Most normal inside and outside payouts stay unchanged, so their house edge becomes 5.2632%.
Red now wins on 18 pockets and loses on 20:
EV on $10 red = (18/38 × $10) − (20/38 × $10) = −$0.5263
A straight-up number wins on one pocket and loses on 37, producing the same expected loss of about 53 cents per $10.
This is why choosing a single-zero wheel is usually more consequential than choosing red instead of a corner. Wheel type changes the standard price; bet family mainly changes volatility.
Two exceptions that change the simple rule
The first-five American bet
The wager covering 0, 00, 1, 2, and 3 pays 6 to 1. It wins on five of 38 pockets:
EV = (5/38 × $60) − (33/38 × $10) = −$0.7895
That is a 7.8947% house edge, worse than the usual 5.2632% on the same double-zero wheel. It is an inside-layout exception and should not be grouped blindly with standard-price inside bets.
Half-back and held-bet rules
Some single-zero games apply La Partage or En Prison to even-money wagers when zero lands. These rules can reduce the house edge on red/black, odd/even, and high/low. They do not normally improve straight-up, split, street, corner, six-line, dozen, or column wagers.
Never assume the rule exists because the wheel has one zero. Check the table notice and house rules.
Hit frequency is not safety
Outside bets feel safer because they return winning chips more often. On a single-zero wheel, an even-money bet wins 18 of 37 spins, which is close to half. That frequent feedback can make a long session feel controlled.
But zero remains a losing outcome under ordinary rules, and repeated action keeps applying the edge. A player making $10 red bets for 100 spins creates $1,000 in total action even if the starting bankroll was only $100.
Inside bets create the opposite illusion. Long losing sequences can make the bet look “due,” while one large payout can make an overall losing session feel successful. Each spin remains independent; prior misses do not increase the next hit probability.
The useful distinction is:
- Outside bets: lower variance per equal-sized wager, more frequent small settlements.
- Inside bets: higher variance per equal-sized wager, fewer but larger winning settlements.
Neither description means positive expectation.
Spreading chips can change the comparison
Suppose two players each intend to wager $20 per spin.
- Player A places one $20 chip on black.
- Player B places four $5 straight-up chips on different numbers.
Both risk $20. Player A wins more often and earns $20 profit on a winning spin. If one of Player B's numbers hits, the winning chip earns $175, while the other three chips lose $15, for a net profit of $160.
Now suppose Player B adds four more numbers without reducing chip size. The style is still “inside,” but total exposure has doubled to $40. A comparison that ignores this increase will wrongly blame volatility for losses caused partly by a larger wager.
Use the roulette odds calculator for coverage and the expected loss calculator for total action. One explains the chance of a hit; the other explains the average cost of the money placed.
What official rules settle
Roulette rules define wagers by chip position, covered outcomes, and payout. The Massachusetts Gaming Commission's approved roulette rules list straight, split, three-number, four-number, first-five, six-number, column, dozen, and even-money wagers with their settlement odds.
That procedural detail matters at live tables. A chip intended as a corner but sitting on a split line is settled according to its final position. Outside boxes are easier to read, while dense inside action creates more opportunities for placement and payout disputes.
From an operations perspective, inside-heavy tables also take longer to clear and pay. More dealer time can reduce decisions per hour. Outside-heavy tables often settle faster, increasing game pace. The house edge per dollar may be the same, but hourly theoretical win can differ because the amount wagered and number of spins differ.
Which family fits a player's stated preference?
A player who wants fewer extreme swings from equal-sized wagers may prefer outside bets. A player who accepts long miss sequences in exchange for occasional larger payments may prefer inside bets. Neither choice should be sold as a winning strategy.
Before choosing, answer four practical questions:
- Is the wheel single-zero or double-zero?
- Does the table offer a special zero rule for even-money wagers?
- What is the total stake across all chips?
- Can the session bankroll tolerate the chosen variance and pace?
The strongest general choice is usually the lower-edge wheel, followed by control of total wager size. Moving chips from the inside grid to the outside boxes does not by itself improve the standard mathematics.
For a complete bet map, read roulette bets explained. For settlement amounts, continue with roulette payouts. The roulette house edge page compares wheel types and rule variations in more detail.