Roulette Payouts Worked Out: Real Math on Real Bets
Bet $10 on red, on a single number, or on a dozen: here's the actual math on wins, losses, and long-run cost for each, spin by spin.
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Roulette Payouts Worked Out: Real Math on Real Bets
The short answer
Every roulette bet costs you the same percentage in the long run on a given wheel, 2.70% on European, 5.26% on American (Wizard of Odds, Roulette Basics, retrieved 2026-07-24). But that percentage looks completely different in practice depending on which bet you make. Here's the real math on three common bets, worked spin by spin.
What happens if you bet $10 on red?
Red pays 1:1 and covers 18 of 37 pockets on a European wheel. Win, and you collect $10 profit. Lose, and you're down $10. On any single spin, you have an 18/37 chance of winning, about 48.6%.
Play this bet for 37 spins at $10 each ($370 total wagered) with theoretically average luck: 18 wins and 19 losses. Wins return $180 in profit; losses cost $190. Net: down $10 across $370 wagered, which is 2.70%, exactly the published house edge (Wizard of Odds, retrieved 2026-07-24).
In practice, real sessions don't split 18/19 that cleanly. Short-run results swing well above or below that average; the 2.70% only shows up reliably over a very large number of spins.
What happens if you bet $10 on a single number?
A straight-up bet pays 35:1 and covers just 1 of 37 pockets, about a 2.7% chance per spin. Win, and you collect $350 profit on your $10 bet. Lose, and you're down $10, same as any losing bet.
Play $10 straight-up on the same number for 37 spins ($370 wagered), with one theoretically average win: you collect $350 profit on that spin and lose $10 on each of the other 36, for minus $360. Net: down $10 across $370, again 2.70% (Wizard of Odds, retrieved 2026-07-24). Identical long-run cost to the red bet, wildly different experience: one win in 37 spins instead of roughly 18.
What happens if you bet $10 on a dozen?
A dozen bet (say, 1-12) pays 2:1 and covers 12 of 37 pockets, about a 32.4% chance per spin. Win, and you collect $20 profit. Lose, and you're down $10.
Play $10 on the same dozen for 37 spins ($370 wagered), with 12 theoretically average wins and 25 losses. Wins return $240 in profit; losses cost $250. Net: down $10 across $370, once again landing at 2.70% (Wizard of Odds, retrieved 2026-07-24).
Bet | Payout | Win chance (European) | Wins per 37 spins (avg) | Net cost per 37 spins @ $10 | Effective edge |
|---|---|---|---|---|---|
Red/black | 1:1 | 18/37 (~48.6%) | 18 | -$10 | 2.70% |
Straight up | 35:1 | 1/37 (~2.7%) | 1 | -$10 | 2.70% |
Dozen | 2:1 | 12/37 (~32.4%) | 12 | -$10 | 2.70% |
Three completely different betting experiences, one identical long-run cost. That's the whole logic behind "no roulette bet is better than another" on a standard wheel: the felt just offers different rides at the same price.
Why do the numbers land on exactly $10 every time?
Because they're built from the same house edge applied to the same total wagered. $370 wagered at a 2.70% house edge costs $9.99, rounding to $10 in each example. Change the total wagered or the wheel, and the dollar figure scales, but the percentage doesn't move.
Switch any of these bets to an American wheel (38 pockets, same payouts) and the expected cost roughly doubles to around $19-20 per $370 wagered, or 5.26% (Wizard of Odds, retrieved 2026-07-24). See house edge by wheel for the full comparison.
What does this mean for how you should bet?
Nothing here tells you which bet to make; the math is neutral between them. It does tell you that chasing "better odds" by switching bet types on the same wheel is a myth, since the cost is identical. What actually moves your odds is wheel choice (European over American) and rules like la partage where offered, both covered in the payout table.
Betting systems like Martingale don't change any of this math either; they only change how much you're risking on each spin, not the percentage the house keeps. Systems myth walks through why in detail.
Play within a budget you set before sitting down, since these numbers describe averages, not guarantees for any single session. Wild.io's responsible gambling tools can help you set that budget in advance. Browse table games at Wild.io to see these bets on a real layout.
For instant results on any bet and wager, try the roulette payout calculator.
Frequently asked questions
Does betting on red cost less than betting on a single number?
No. Both carry the identical 2.70% house edge on a European wheel. Red wins more often for a smaller payout; a single number wins rarely for a much larger payout, but the long-run cost per dollar wagered is the same.
Why do all these examples land on $10 lost per $370 wagered?
Because $370 times the 2.70% European house edge equals almost exactly $10. It's a rounding coincidence of the example size, not a special property of any one bet.
Does the math change on an American wheel?
Yes. American wheels carry a 5.26% house edge instead of 2.70%, so the same $370 wagered would cost roughly $19-20 in the long run instead of $10, on any standard bet.
Can I expect to lose exactly the house edge in one session?
No. These figures are long-run averages over many spins. A single session, even 37 spins, can land well above or below the average in either direction purely from normal variance.
Is a dozen bet a good middle ground between red/black and single numbers?
It's a different experience, not a better deal. A dozen bet wins less often than red/black but more often than a single number, with a payout in between. All three carry the same house edge on a European wheel.
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About the author
Trust & Responsible Play Writer
Marcus focuses on judging casinos before you deposit — licensing checks, red flags, scam patterns — and the bankroll habits and limit tools that keep play under control.
