Roulette Win Calculator: How to Work Out Payouts and Profit

What you need to calculate a roulette bet

Start with the amount placed on one bet and the payout ratio shown in the relevant paytable. To assess the chance of winning, you also need to know how many pockets the wheel has and how many your bet covers.

A payout calculation and a probability calculation answer different questions. The first tells you what a winning bet would pay under the stated rules. The second estimates how likely that win is under a fair-wheel model. Neither tells you which pocket the ball will land in.

If you are checking a roulette bet calculator, look carefully at its result labels. A figure described as winnings or payout might mean profit alone or the full return including your original stake. An example provided by the tool, if available, can help clarify which meaning it uses.

• Record the stake on the individual bet.
• Check the bet type and its profit payout in the table’s rules.
• Calculate the winning profit, total return and losing result.
• Check the wheel and any special zero rules before interpreting probability or settlement.

How to calculate profit, total return and loss

For a standard bet with stake S and a profit payout of a:1, multiply the stake by a to find the profit if it wins. Add the original stake to that profit to find the total return. If the bet loses, the net result is the loss of the stake.

These formulas assume the bet is settled immediately, with no fees or special treatment of zero. A roulette payout calculator may show either profit or total return, so check the label before comparing its result with your own arithmetic.

• Winning profit = stake × payout multiplier.
• Winning total return = stake × (payout multiplier + 1).
• Losing net result = minus the stake.

Worked example: A$10 on one number

A straight-up bet covers one number. Under a standard 35:1 profit payout, a winning A$10 bet produces A$350 in profit. The original A$10 stake is also returned, making the total return A$360.

If the chosen number does not land, the stake is lost and the net result is minus A$10. The A$360 return is therefore not the same as A$360 profit: A$10 of it was already yours before the spin.

A roulette profit calculator should make that distinction clear, but terminology varies. The calculation here is based on a standard paytable and is not a tested result from the unavailable page.

• Stake: A$10.
• Profit if the number wins: A$10 × 35 = A$350.
• Total return if it wins: A$350 + A$10 = A$360.
• Net result if it loses: −A$10.

How to combine several bets on one spin

When you place more than one bet, an individual wager can win while the whole spin breaks even or loses. To find the overall result, add the total returns from all winning bets, then subtract the amount staked across every bet on that spin.

For example, suppose you place A$10 on red and A$10 on number 7, which is red, on a single-zero layout. Assume red pays 1:1 and the straight-up bet pays 35:1. Your total stake is A$20.

If 7 lands, both bets win. The red bet returns A$20 and the number bet returns A$360. Together they return A$380, leaving an overall profit of A$360 after subtracting the A$20 staked.

If another red number lands, the red bet returns A$20 but the bet on 7 loses. The overall net result is A$0. If black or zero lands under ordinary rules, both bets lose and the overall result is −A$20.

Some calculators may handle combined positions, but support for multiple bets on the supplied page could not be verified. You can use the same add-returns, subtract-total-stake method to check the result manually.

Bet types, payouts and chances

A straight-up bet covers one pocket; a red, black, odd, even, low or high bet covers 18 numbered pockets. Bets covering more pockets generally pay less when they win. Coverage determines the modelled chance, while the paytable determines the profit.

For a fair wheel, the chance of a bet winning is the number of covered pockets divided by the total number of pockets. The comparisons below use standard profit payouts, 37 pockets for single zero and 38 for double zero. Percentages are rounded and describe the chance on one spin, not a promise about short-run results.

The listed payouts are profit ratios: the winning stake is returned separately. Actual paytables and special rules should be checked at the table.

• Straight-up: 1 pocket; 35:1 profit payout; 2.70% chance on single zero and 2.63% on double zero.
• Split: 2 pockets; 17:1; 5.41% on single zero and 5.26% on double zero.
• Street: 3 pockets; 11:1; 8.11% on single zero and 7.89% on double zero.
• Corner: 4 pockets; 8:1; 10.81% on single zero and 10.53% on double zero.
• Six-line: 6 pockets; 5:1; 16.22% on single zero and 15.79% on double zero.
• Dozen or column: 12 pockets; 2:1; 32.43% on single zero and 31.58% on double zero.
• Red or black, odd or even, low or high: 18 pockets; 1:1; 48.65% on single zero and 47.37% on double zero.

Why the wheel and zero rules matter

A single-zero wheel has 37 pockets, including zero; a double-zero wheel has 38, including zero and double zero. For one chosen number, the fair-wheel chance is therefore 1 in 37 on the first wheel and 1 in 38 on the second.

A standard straight-up payout may be 35:1 on either wheel, so the potential winning profit can stay the same while the probability changes. A roulette odds calculator that estimates probability needs the pocket count; a payout-only calculation needs the paytable. Always check the actual game rather than assuming every variant uses the same payout.

Under ordinary settlement, zero causes the even-money outside bets in the comparison above to lose. Some games offer a special rule called la partage: when zero lands, half of an even-money stake is returned. On an A$10 bet, that would ordinarily mean A$5 returned and a A$5 loss, subject to the game’s rounding rules.

En prison is different. Instead of returning half immediately, it holds the stake for subsequent settlement. The treatment of another zero and other details can vary, so read the specific rules before calculating the result. Neither special rule should be assumed to apply unless it is offered.

Expected loss and what it does not predict

Expected value describes the average net result per bet in a mathematical model over the long run. For a standard bet with only a win or loss outcome, multiply the probability of winning by the winning profit, then subtract the probability of losing multiplied by the stake.

For the A$10 straight-up bet on a fair single-zero wheel, the calculation is (1/37 × A$350) − (36/37 × A$10). The result is −A$10/37, or approximately −A$0.27 per spin. Relative to the A$10 stake, this corresponds to a house edge of approximately 2.70%.

That does not mean A$0.27 is deducted from your balance on the next spin. The actual net result for this example is either a A$350 profit or a A$10 loss. A session can differ considerably from the modelled average, even though the average helps explain the cost of repeated betting.

For most standard double-zero bets, the modelled house edge is approximately 5.26%. Special bets and zero rules can change the edge, so that figure does not apply to every possible wager.

A calculator cannot predict the next winning number. Under the fair, independent-spin model, previous results do not make a number due. Changing stakes through a progression can change how much you risk and the range of possible outcomes, but it does not remove the model’s negative expected value.

Australian rules and gambling support

Australian Government guidance states that providing online casino games, including roulette, to a person physically in Australia is prohibited under the Interactive Gambling Act 2001. The Act targets providers rather than their potential or actual customers. This is not a claim that roulette calculators or all forms of roulette are illegal.

Land-based casino regulation and table rules depend on the jurisdiction and venue. Crown Perth’s published rules are a useful example of a paytable, but they do not establish the rules at every Australian casino. An offshore online service being accessible from Australia does not establish that it is lawful to provide here.

If you choose to gamble, consider setting an affordable limit beforehand and do not treat losses as money that must be recovered. Gambling Help Online can be contacted on 1800 858 858; its online chat is available 24/7 across Australia.

FAQ

Does a roulette calculator show profit or total payout?

It depends on the calculator and how it labels its results. Profit excludes the original stake, while total return includes it. In the A$10 straight-up example, the winning profit is A$350 and the total return is A$360. The supplied page’s labels could not be verified.

Does the wheel variant change a roulette calculation?

It changes the modelled chance when the number of pockets changes. One selected number has a 1/37 chance on a fair single-zero wheel and a 1/38 chance on a fair double-zero wheel. The same named bet may have the same payout on both, but check the particular paytable and zero rules.

Can I calculate several roulette bets at once?

Yes, you can calculate the combined result manually by adding the returns from winning bets and subtracting the total staked on all bets. Some calculators may support multiple bets, but whether the supplied page does so is unverified.

Can a roulette win calculator predict a winning number?

No. A potential payout or modelled probability is not a prediction. Under a fair, independent-spin model, a number that has not appeared recently still has a 1/37 chance on the next spin of a single-zero wheel.

Can I use Australian dollars in the calculation?

Yes, the arithmetic works in Australian dollars as long as the stake and results use the same units. For example, a standard 1:1 win on A$10 gives A$10 profit and A$20 total return. Whether the supplied tool accepts AUD or offers a currency selector is unknown.

What does an expected loss of A$0.27 mean?

For the modelled A$10 single-zero straight-up bet, it is the approximate long-run average net loss per identical bet. It is not an amount deducted on each spin. The next-spin net result in that example is either a A$350 profit or a A$10 loss.