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Number 31 — the complete card

31 pays 35:1 straight-up ($10 wins $350 profit) on every wheel. It’s black, odd, high (19–36), dozen 3, column 1, and hits 1 in 37 European spins / 1 in 38 American. ⚙ computed

On the wheel

European rim, reading 20 · 14 → 31 → 9 · 22. American rim: 8 · 19 → 31 → 18 · 6. Racetrack membership: Orphelins — the announced bets that physically cover this pocket (math here). “Neighbour” talk means the rim, never the felt — two different maps.

On the felt

Street trio: 31-32-33 (11:1). Split partners on the grid: 32, 28, 34 (17:1 each) — an edge-of-grid number, fewer corners than the interior. Every combination prices identically: the 36-pocket fiction doesn’t care which squares you pick.

Betting 31 — the honest numbers

At $10 per spin, 100 spins of straight 31 wagers cost an expected $27 on European wheels and $53 on American — identical to any bet, wrapped in maximum volatility (SD 5.8). Back-to-back 31: 1 in 1,369. In our 3.7-million-spin reference run, 31 landed 100,379 times against 100,000 expected (+0.38%) — textbook uniformity, the same verdict every number gets.

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Related

← 3032 →all numbersstraight-up math“best numbers” vs data

Frequently asked

What does 31 pay in roulette?
35 to 1 straight-up — a $10 bet returns $350 profit plus your stake. Splits touching 31 pay 17:1, its street 11:1.
Is 31 red or black in roulette?
31 is black — fixed by the traditional color chart on every wheel, odd and high (19–36) for outside-bet purposes.
What are the neighbours of 31 on the wheel?
European rim: 14 and 9 adjacent, 20 and 22 beyond — a five-number “neighbours” call covers exactly this arc. Felt neighbours are different animals — wheel order and grid order share nothing.