Roulette Odds Calculator

Pick a wheel and a bet, and see the true odds, the payout you are offered, and the gap between the two. That gap is the house edge, and on a single-zero wheel it is the same for every bet on the table.

Wheel

Bet type

Stake per spin

Spins

Used for the turnover and cumulative-cost figures.

Win chance—

House edge—

Odds—

Payout offered—

True odds—

Return to player—

Profit on a win—

Total returned on a win—

Expected cost per spin—

Turnover over the spins—

Expected cost over the spins—

Chance of at least one hit—

Every bet on the selected wheel

Bet	Covers	Pays	Chance	Odds	Returns per $100	Edge

How the numbers are derived

There is no estimation here. Payouts in roulette are set as though the wheel had 36 pockets: a bet covering k numbers pays 36 ÷ k − 1 to 1. A corner covers four numbers and pays 36 ÷ 4 − 1 = 8 to 1.

Expected return is then (payout + 1) × k ÷ N, where N is the real pocket count. On a European wheel that is always 36/37 = 97.30%, so the edge is 2.70%. On American, 36/38 = 94.74% and the edge is 5.26%. Mini Roulette scales the same formula to 12 and 13, giving 7.69%.

La partage adds one term: when zero lands, an even-money bet loses only half, so expected return gains 0.5 × zeros ÷ N. On a French wheel that is 0.5 ÷ 37 = 1.35%, exactly enough to halve the edge on those bets.

What "true odds" means

True odds are what a fair bet would pay. A straight-up bet on a European wheel wins once in 37, so fair odds are 36 to 1. You are offered 35 to 1. That one-unit shortfall, spread across 37 spins, is the 2.70%. Every roulette bet is the same story with different numbers.

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18+. Roulette has a fixed house edge, so over enough spins the maths favours the operator — always. If you play for real, treat it as money spent on entertainment, set a limit before you start and stop when you reach it. Our responsible gambling page covers the warning signs and where to get free, confidential help.