Most roulette guides tell you that outside bets are “safer” and leave it there. That is half a truth dressed up as advice. The real question is what an outside bet costs you per spin once you account for the wheel you are playing on, and the arithmetic is not hard once you stop hand-waving. A €1 even-money bet returns -€0.027 in expectation on European roulette and -€0.053 on American roulette, because that second zero roughly doubles the bleed. Below is the step-by-step method for working that out yourself, plus how to apply it to the live tables at CasinoLab without fooling yourself about what the cashback is doing.
Define the Bet and the Wheel Before You Touch the Formula
Expected value is just a weighted average of outcomes. Before you can calculate it, you need two facts nailed down: the probability of winning and the payout the table offers. Outside bets are the easy case because the payout is fixed and the probability is a simple count of pockets. Even-money bets cover 18 numbers, so on a 37-pocket European wheel the win probability is 18/37, and on a 38-pocket American wheel it is 18/38.
The trap is assuming the payout matches the probability. It does not, and that mismatch is the entire house edge. An even-money outside bet pays 1:1, which implies a 50% chance of winning. The wheel never offers exactly 50%. The gap between the implied probability and the real one is where your money goes, spin after spin.
This is why the wheel matters more than the bet. A European roulette table with a single zero leaks slowly. An American roulette table with the double zero leaks about twice as fast on the same bet, same stake, same payout. Nothing about the bet changes; only the denominator changes. On a live dealer table the croupier, the wheel and the betting timer are all real, but the pocket count is fixed by the variant, so check the variant label before you assume anything.
Run the EV Formula Step by Step
Step one: multiply win probability by payout, then subtract loss probability times stake
The formula for a single €1 even-money bet is: (probability of winning x payout) minus (probability of losing x stake). Payout on a win is €1 profit plus your €1 returned, but for EV purposes you count the net profit, so the payout multiplier is 1. Stake is €1. That gives you a clean number you can scale to any bet size.
European roulette, even-money bet, €1 stake. Win probability is 18/37, which is 0.4865. Loss probability is 19/37, which is 0.5135, because the single zero is a losing pocket on an outside bet. Expected value equals (0.4865 x €1) minus (0.5135 x €1), which is €0.4865 minus €0.5135, or -€0.027. That is minus 2.7 cents per euro wagered, which is the familiar 2.7% house edge expressed as a cash figure.
American roulette, same bet, €1 stake. Win probability is 18/38, which is 0.4737. Loss probability is 20/38, which is 0.5263, because both the zero and the double zero beat you. Expected value equals (0.4737 x €1) minus (0.5263 x €1), which is -€0.0526. Round it to -€0.053. The loss per euro has almost exactly doubled, and it doubled because one extra pocket was added to the losing side of the ledger.
Step two: scale the result to your actual stake and session length
The per-euro figure is the useful unit because it scales linearly. A €10 even-money bet on European roulette has an expected loss of €0.27. A €50 bet has an expected loss of €1.35. If you place 100 bets of €10 on European roulette, your expected loss across the session is €27, and on American roulette it is €53. Those are averages over a long run, not predictions for any single evening, but they tell you the direction and the size of the drift.
Now apply the same method to the other outside bets. Dozens and columns pay 2:1 and cover 12 numbers, so on European roulette the win probability is 12/37 and the loss probability is 25/37. Expected value per €1 equals (12/37 x €2) minus (25/37 x €1), which is €0.6486 minus €0.6757, or -€0.027. Same number. Red or black, odd or even, high or low, dozens and columns all land on the same -2.7% on a single-zero wheel. The payout ratio is calibrated to the coverage, and the single zero is priced in identically across all of them.
That uniformity is worth internalising, because it kills a common myth. Switching from red or black to a dozen does not improve your expected value. It changes the variance, the frequency of wins and the size of each payout, but the long-run cost per euro is identical. If someone tells you dozens are “smarter” than even-money bets, they are describing how the bet feels, not how it prices.
| Bet and wheel | Win probability | Payout | EV per €1 stake | House edge |
|---|---|---|---|---|
| Even-money, European (single zero) | 18/37 = 0.4865 | 1:1 | -€0.027 | 2.7% |
| Even-money, American (double zero) | 18/38 = 0.4737 | 1:1 | -€0.053 | 5.26% |
| Dozen or column, European | 12/37 = 0.3243 | 2:1 | -€0.027 | 2.7% |
| Dozen or column, American | 12/38 = 0.3158 | 2:1 | -€0.053 | 5.26% |
See How the Live Lobby Changes the Inputs
CasinoLab live casino offers hundreds of tables operating around the clock, and the live dealer lobby is where the variant choice actually happens. European roulette and American roulette sit side by side, often with similar-looking interfaces, and the only meaningful difference for your EV is the pocket count. Before you sit down, read the table name, and if you want to compare options first, https://casinolab-online.uk/live-casino/ is where the lobby is set out. If it does not say single zero or European, assume the worse wheel until you have counted the pockets on screen.
Stake sizing is the other input you control. CasinoLab roulette starts wagers at €0.10, which means you can run the formula at a stake where the expected loss per spin is fractions of a cent. At €0.10 on European roulette the expected loss is €0.0027 per spin. That is not a reason to spin endlessly, because the losses accumulate in proportion to total turnover, but it does mean the minimum stake lets you learn the table without paying much for the lesson.
The live cashback promotion is worth pricing honestly rather than treating as a rescue. CasinoLab promotes a 25% live cashback, and a rebate on losses does reduce your net expected loss, but only on the portion that qualifies and only up to whatever cap applies. If you lose €100 on European roulette outside bets and receive 25% back, your net loss is €75 for that session, which improves the session outcome but does not change the underlying -2.7% per spin. Cashback softens variance; it does not flip a negative-EV bet positive. Treat it as a discount on bad nights, not as an edge.
Game shows sit in a different category and deserve a separate calculation. CasinoLab game shows accept fractional wagers, and titles from Evolution and Pragmatic Play such as Crazy Time and Lightning Roulette use multiplier mechanics that break the clean pocket-count arithmetic. Lightning Roulette keeps a standard wheel but applies random multipliers to straight-up wins, so the EV depends on the average multiplier across spins rather than a fixed payout. Crazy Time adds a multiplier wheel and bonus rounds with their own probabilities. You can still run the formula, but you need the published return figure for each game rather than a pocket count, because the payouts are not fixed per bet type.
Apply the Numbers to Real Table Choices
CasinoLab blackjack sets minimum bets around €1 to €5, and the blackjack interface provides side bets such as Perfect Pairs. Side bets are a classic place where players abandon EV thinking. The Perfect Pairs side bet has its own payout table and its own house edge, which is typically far worse than the main game, so a €1 side bet is not equivalent to a €1 main-hand bet even though both cost a euro. Run the same win-probability-times-payout calculation on the side bet’s paytable before you treat it as harmless.
Gold Saloon is reserved for high-limit play, and the Gold Saloon banner tiles display a highest limit of €20,000. High limits do not change the house edge, but they change the cash consequence of it. At a €1,000 even-money bet on European roulette, the expected loss per spin is €27. That is the same 2.7% you calculated at €1, just scaled up. High-roller tables reward discipline about stake size, not bravery about bet selection.
Speed baccarat and squeeze baccarat are worth a mention because they illustrate the same principle in a different game. Faster dealing means more hands per hour, which means more exposure to the house edge per hour even though the edge per hand is unchanged. If you are comparing a live dealer roulette session against a speed baccarat session, compare total turnover, not bet size. The formula does not care which game you play; it cares how much you push through it.
The Top Live section is the practical shortcut for finding the right wheel. CasinoLab runs in the phone browser without an app or APK, so no-download mobile play means you can check the variant label, the minimum stake and the maximum limit before you place a bet, rather than after. That two-minute check is worth more than any betting system, because it is the only step that changes the probability side of the equation.
Work the formula once on paper for your usual stake and your usual wheel, then keep the number in your head. If you play European roulette outside bets at €5 a spin, your expected loss is about €0.135 per spin, and a 200-spin session costs you roughly €27 in expectation. If you switch to an American wheel at the same stake, that doubles to about €54. The bet type does not matter, the payout table does not matter, and no progression system changes either number. What changes the number is the wheel, the stake and the total number of spins, and those are the three things you actually control at the table.