Players spend a lot of energy choosing between roulette bets, on the assumption that some are better value than others. On a single-zero wheel they are not. Every bet on the table costs exactly the same.

Not approximately the same. The same number, to the decimal place.

The trick in the payouts

A single-zero wheel has 37 pockets: 1 to 36, plus a green zero.

Now look at what a straight-up bet on one number pays: 35 to 1. If the wheel had 36 pockets, that would be perfectly fair — you would win once in 36 tries and collect 35 plus your stake back, breaking even forever.

But the wheel has 37 pockets. The payouts are calculated as though the zero were not there. That single pocket is the entire house edge, and every other payout on the table is built the same way.

The arithmetic, bet by bet

Stake one chip on the same bet for 37 spins — long enough for each number to come up once on average. Here is what comes back:

  • Straight up (1 number, pays 35:1) — wins once, returns 36 chips.
  • Split (2 numbers, pays 17:1) — wins twice, 18 each, returns 36.
  • Street (3 numbers, pays 11:1) — wins three times, 12 each, returns 36.
  • Corner (4 numbers, pays 8:1) — wins four times, 9 each, returns 36.
  • Six line (6 numbers, pays 5:1) — wins six times, 6 each, returns 36.
  • Dozen or column (12 numbers, pays 2:1) — wins twelve times, 3 each, returns 36.
  • Red, black, odd, even, high, low (18 numbers, pays 1:1) — wins eighteen times, 2 each, returns 36.

Thirty-seven chips in. Thirty-six chips back. Every single time.

That missing chip is 1 ÷ 37 = 2.70%, and it is the house edge on our roulette table — whichever bet you place.

Where the zero does its work

On the inside bets the zero is simply one more number you did not pick. On the outside bets it is more pointed: zero is not red, not black, not odd, not even, not high and not low. It belongs to no outside group, so when it lands, every outside bet on the table loses at once.

That is the mechanism. Not a fee, not a rake — one pocket that pays nobody.

Why covering more numbers does not help

A popular idea is to spread chips across the layout so that most spins produce a win somewhere. It feels safer, and it does change how the evening feels — but it cannot change the cost.

If every bet loses 2.70% of what you stake, then any combination of them loses 2.70% of what you stake. An average of identical numbers is that same number. You can cover thirty-five of the thirty-seven pockets and still be paying precisely 2.70%; you have only rearranged the wins into something smoother.

So what does the choice change?

Variance, and nothing else. Betting one number wins rarely and pays hugely; betting red wins almost half the time and pays small. Same cost, entirely different ride.

Which means the honest way to choose a roulette bet is to ask what kind of session you want, not which bet is best value. There is no best value. There is one price, and seven ways to pay it.

Worth knowing: our table is a single-zero wheel. A double-zero wheel adds a second green pocket, and the same payouts against 38 pockets push the edge to 5.26% — nearly twice as expensive for an identical-looking game.

What the house edge really means · Variance vs house edge · Why past spins mean nothing