OddsCalc
Roulette Odds Calculator
Every bet, same edge — here is the maths.
Roulette bets, payouts, and house edge
Payouts are set as if the wheel had 36 pockets, but a European wheel has 37 and an American wheel 38. That gap is the entire house edge.
| Bet | Numbers covered | Wheel | Win probability | Payout | House edge |
|---|---|---|---|---|---|
| Straight up | 1 | European (37) | 2.70% | 35.00 : 1 | 2.70% |
| Straight up | 1 | American (38) | 2.63% | 35.00 : 1 | 5.26% |
| Split | 2 | American (38) | 5.26% | 17.00 : 1 | 5.26% |
| Double street | 6 | American (38) | 15.79% | 5.00 : 1 | 5.26% |
| Dozen | 12 | European (37) | 32.43% | 2.00 : 1 | 2.70% |
| Dozen | 12 | American (38) | 31.58% | 2.00 : 1 | 5.26% |
| Red / black | 18 | European (37) | 48.65% | 1.00 : 1 | 2.70% |
| Red / black | 18 | American (38) | 47.37% | 1.00 : 1 | 5.26% |
Every bet on a given wheel carries the same house edge, so no combination of bets improves your position. The single-zero European wheel is twice as good as the double-zero American one, which is the only choice that actually matters. Gambling odds always favour the house over time. Treat any stake as money spent on entertainment, and never as an expected return.
Every bet carries the same edge
A straight-up number and a red/black bet feel completely different, but on a European wheel both give back 97.3% over the long run. Bet type changes how often you win and how much you win, never the expectation — the single zero is what creates the edge, and it applies to all of them equally.
Why the American wheel is worse
Adding a double zero takes the wheel from 37 pockets to 38 while payouts stay identical. That one extra pocket roughly doubles the house edge from 2.7% to 5.26%, which is why a European wheel is always the better table when both are available.
Frequently asked questions
I bet $25 on a single number on a European wheel — what's my expected return?
You'd win $875 (35:1 payout × $25) about 2.7% of the time and lose $25 the other 97.3%. Your expected return per spin is $25 × (−1/37) = about −$0.68, or a 2.7% loss rate.
How is roulette different from poker odds?
Roulette odds are fixed by the wheel design — every spin is independent and the house always has an edge. Poker odds are dynamic, changing with each card dealt and influenced by skill, position, and opponent behavior.
Is there any roulette bet with a lower house edge?
On European wheels, the 'en prison' or 'la partage' rules on even-money bets halve the edge to 1.35%. On American wheels, the five-number bet (0/00/1/2/3) is actually worse at 7.89%. Otherwise, all bets carry the same edge per wheel type.
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OpenLast updated: September 7, 2026