> ## Content Index > Fetch the complete content index at: https://www.mega888.international/llms.txt > Use this file to discover other available public pages before exploring further. # How Online Casinos Make Money: House Edge, RTP and Player Economics Explained - URL: https://www.mega888.international/how-online-casinos-make-money/ - Published: 2026-10-26T12:24:24.000Z - Updated: 2026-10-26T12:24:24.000Z - Description: If casinos keep paying out winnings, how do they stay profitable? House edge, RTP, betting volume, bonuses and costs explained, and why casino revenue is not the same as profit. - Author: Andrius Wijaya - Tags: Gambling Research You may have read about someone winning $10,000 at an online casino, or walking away with far more than they deposited. Those wins really do happen, sometimes for large amounts. So how do online casinos stay profitable while paying out winnings? The answer lies in how casino games are built. Roulette, slots, baccarat and other games have a built-in house edge, which gives the casino a mathematical advantage over a large number of bets. The flip side is RTP, or return to player, the share of stakes a game is designed to pay back. But a casino's profit depends on more than wins and losses. Deposits, betting volume, bonuses, game suppliers, taxes and many other costs all play a part. This article explains how these pieces fit together, and why a casino's revenue is not the same as its profit. ## How do online casinos make money? Most online casino revenue comes from the difference between what players bet and what they win back. Games are built around probabilities. A player can win any single round, but payouts are set slightly below the true odds of winning. Across enough bets, that gives the casino an expected advantage. Take European roulette. A $10 straight-up bet on one number pays $350 if it wins, odds of 35 to 1\. But the wheel has 37 pockets, so the true odds are 36 to 1\. That gap is the casino's edge. ### Deposits, bets and revenue are different things Say you deposit $100\. The casino has not earned anything yet: the money is still yours until you bet it. You might bet $20, win $40 and keep playing, or lose a few bets and stop. The amount deposited, the amount wagered and the amount the casino ends up earning are three different numbers, and they need to be kept separate. ## What is the house edge? The house edge is the percentage of all money wagered that the casino expects to keep over the long run. It is not taken from every individual bet. It comes from the relationship between a game's payouts and the probability of winning. European roulette makes the maths easy. ### How it works A European roulette wheel has 37 numbers, 0 to 36\. A bet on one number has a 1 in 37 chance of winning and pays 35 to 1\. Because the payout is below the true odds, the casino's expected profit is about 2.70% of the money wagered. If players bet a total of $10,000 on European roulette, the casino can expect to keep about $270 as gross gaming revenue, though the actual result could be much higher or lower. ### Does the house edge guarantee profit? No. The house edge describes what to expect across a very large number of bets. On any given day, a few big wins can leave the casino with far less than expected. And even $270 of gaming revenue is not $270 of profit, because the casino still has its running costs. Explanations that treat the house edge as a profit margin are misleading. ## How does RTP affect casino earnings? ![A slot game showing its return to player percentage](https://storage.ghost.io/c/08/25/082503a4-a25b-4e82-88be-526735f18f5b/content/images/2026/10/mega888-14-2.webp) Online slots often display an RTP figure such as 96% or 97%. RTP is the share of all money staked that a game is designed to pay back as winnings. A 96% RTP slot is designed to pay back $96 for every $100 staked over the long run. ### RTP and house edge RTP and house edge describe the same game from opposite sides: **House edge = 100% − RTP** A 96% RTP slot has a theoretical house edge of 4%; a 98% RTP game has a 2% edge. That does not make the first game more profitable for the casino: a lower-margin game that attracts far more betting can earn more than a higher-margin game few people play. The figures also depend on each game's rules and settings. ### Theoretical RTP vs actual payouts A common misunderstanding is that playing $100 on a 96% RTP slot means you will leave with $96\. You might leave with nothing, or with more than you started with. RTP describes the game's mathematical design, not a single session. The UK Gambling Commission's [RTP guidance](https://www.gamblingcommission.gov.uk/licensees-and-businesses/guide/page/how-to-calculate-return-to-player-rtp?ref=mega888.international) gives an example of a game designed for 91.68% RTP that returned 90.42% over the period measured. Results vary with how much play has taken place. RTP tells you what to expect over the long run, not what the next spin will pay. ## Which games have higher margins? ![Roulette, blackjack, baccarat and slot games with different house edges](https://storage.ghost.io/c/08/25/082503a4-a25b-4e82-88be-526735f18f5b/content/images/2026/10/mega888-14-3.webp) House edges vary from game to game. Even roulette differs depending on whether the wheel has one zero or two, and in blackjack the rules and the player's decisions change the expected result. | Game | Illustrative house edge | Theoretical RTP | What affects it | | -------------------- | ------------------------------- | --------------- | ----------------------------------- | | European roulette | 2.70% | 97.30% | Single-zero wheel, standard payouts | | American roulette | 5.26% | 94.74% | Double-zero wheel, standard payouts | | Baccarat, banker bet | About 1.06% | About 98.94% | Standard 5% commission | | Blackjack | Around 0.5% in favourable games | Around 99.5% | Rules and correct basic strategy | | Online slots | Varies | Varies | Game design and RTP setting | These figures are examples, not rates for every casino. Blackjack with less favourable rules gives the house a bigger edge, and slots come with many different RTPs. Volume matters too. A popular roulette table can earn the casino more than a high-margin slot nobody plays. A game's percentage alone does not show which game earns the operator the most. ## How repeated betting creates revenue A $100 deposit is rarely bet just once. Players often win some rounds and keep betting with those winnings, which is why a casino's total betting can be far larger than what customers deposit. ### Deposits vs turnover Turnover is the total amount bet, including winnings that are bet again. Deposit $100 and bet $10: if you win $15 back, your balance is $105, and you can keep betting without depositing more. The more you play, the higher your total turnover, even though you only deposited $100\. The UK Gambling Commission's guidance on [monitoring game performance](https://www.gamblingcommission.gov.uk/licensees-and-businesses/guide/live-return-to-player-performance-monitoring-of-games-of-chance?ref=mega888.international) counts recycled winnings as part of turnover. So a casino's turnover does not represent new deposits. ### A $100 example Imagine a slot with 96% RTP. You deposit $100 and keep playing with your returns until you have wagered $1,000 in total, without depositing again. On average: | Measure | Amount | | ----------------------- | ------ | | Initial deposit | $100 | | Total wagered | $1,000 | | Theoretical RTP | 96% | | Expected total returns | $960 | | Expected casino revenue | $40 | $960 sounds like a lot against a $100 deposit, but it is not money won. It is the total returned across all your bets, much of it recycled. Betting $1,000 and getting $960 back is an expected loss of $40, which would leave $60 of your $100\. Real sessions vary widely: you could win more, or lose everything before reaching $1,000 in bets. ### Why volume matters **Expected gross gaming revenue = total wagers × house edge** If players bet $100,000 on games with a 4% house edge, the expected gaming revenue is $4,000\. That is why casinos care about betting volume, not just deposits. It also shows the risk for players: with a house edge against you, every extra bet increases your expected loss. ## From wagers to actual profit ![The technology and software behind an online casino](https://storage.ghost.io/c/08/25/082503a4-a25b-4e82-88be-526735f18f5b/content/images/2026/10/mega888-14-4.webp) A casino can generate millions in gaming revenue and still make a much smaller profit, because running a gambling site involves software suppliers, payment processors, staff, regulators and marketing. ### Gross gaming revenue (GGR) **GGR = total stakes − player winnings** If a casino takes $500,000 in bets in a month and pays out $475,000, its GGR is $25,000\. That does not mean customers deposited $500,000; much of the betting may be recycled winnings. The UK Gambling Commission calls this gross gambling yield (GGY), and its [GGY guidance](https://www.gamblingcommission.gov.uk/guidance/regulatory-returns-guidance/rr-guidance-how-to-calculate-your-gross-gambling-yield-ggy?ref=mega888.international) explains how bonuses are treated. ### Net gaming revenue (NGR) NGR is another common term in industry reports. It usually means GGR after deducting bonuses, and some companies also deduct gambling taxes or other items. Because definitions vary, NGR figures are hard to compare between companies. ### Operating costs and profit Back to our casino with $25,000 of GGR. Its results might look like this: | Item | Amount | | --------------------------------- | ---------- | | Gross gaming revenue | $25,000 | | Promotions | −$3,000 | | Gaming duties and taxes | −$4,000 | | Game supplier fees | −$3,500 | | Payment processing | −$1,000 | | Marketing and affiliates | −$5,000 | | Staff, technology and compliance | −$6,000 | | **Illustrative operating profit** | **$2,500** | These figures are invented for illustration. The casino earned $25,000 from gambling but kept $2,500 after costs. Many costs depend on how the business is run: most online casinos license games from specialist studios rather than building them. Evolution's [2024 annual report](https://www.evolution.com/wp-content/uploads/2025/04/Evolution-Annual-Report-2024.pdf?ref=mega888.international), for example, describes charging operators a mix of fixed and variable fees. The money a game generates does not all stay with the casino that offers it. ## How bonuses affect the economics Welcome bonuses, free spins and other promotions can look like free money, but for casinos they are a customer acquisition cost. ### Welcome bonuses and free spins A $50 welcome bonus does not usually mean $50 in withdrawable cash. It may be restricted credit or free spins, with conditions before any winnings can be withdrawn. The real cost to the casino may differ from the headline amount, and a promotion does not guarantee profit: a player can take a bonus, win, withdraw and never return. ### Wagering requirements Many bonuses require players to bet a certain amount before bonus winnings can be withdrawn; others have lighter conditions or none. These terms shape what a promotion costs, and they vary by operator and jurisdiction. Bonus balance can look like cash but may not be withdrawable on the same terms. ## Why some players generate more revenue ![A marketing dashboard tracking customer acquisition and retention](https://storage.ghost.io/c/08/25/082503a4-a25b-4e82-88be-526735f18f5b/content/images/2026/10/mega888-14-5.webp) Players are not equally valuable to a casino. One deposits $50, plays a few games and leaves; another keeps coming back and bets much more. Deposits alone do not show a player's value. What matters is what the operator spends to attract and serve them, and the revenue their betting actually generates. ### Acquisition cost Customer acquisition cost (CAC) is what a casino spends to win a new customer through search marketing, sponsorship, affiliates and promotions. If a campaign costs $2,000 and brings in 100 depositing customers, the CAC is $20 each. That shows what the casino spent, not whether those customers were profitable. A customer who deposits once and withdraws their balance may generate little or no gaming revenue. ### Lifetime value Player lifetime value (LTV) estimates the revenue a customer will bring over time, after the costs of keeping them. Imagine two players who each deposit $500\. One withdraws $600; the other loses $200 and stops. Same deposits, very different value to the casino. LTV is a rough estimate based on past behaviour and assumptions, and it cannot predict what any individual will win or lose. ### Retention and responsible gambling Keeping existing customers is usually cheaper than finding new ones, and casinos study retention like any business. But gambling raises specific concerns: every return visit increases a player's financial exposure, and players who come back to win back losses are a particular worry. That is why responsible gambling measures matter. Depending on the jurisdiction, operators may have to offer deposit limits, self-exclusion and monitoring for signs of harm. The revenue a customer generates is no reason to skip those protections. ## Can online casinos lose money? Yes, in several ways. A casino may offer games with a positive house edge but attract too little betting to cover its costs. A new operator may spend heavily on licences, software, staff and marketing before it has enough customers. Big payouts are another risk: if several players win large amounts in the same period, actual revenue can fall well below expectations, although jackpot arrangements and supplier contracts may share some of that risk. Regulation matters too: tax, licensing, compliance and advertising rules differ widely between countries. A good house edge alone does not guarantee a profitable business. ## What this means for players Understanding RTP matters. A 96% RTP slot still has a 4% house edge. A winning streak does not remove it, and a losing streak does not make a win due: with independent random outcomes, past results do not affect the next one. Watch the total amount you bet, too. A small deposit can turn into a large total wager when winnings are recycled, and every extra bet adds to your expected loss. The maths describes expected results across many bets, not a reliable way for an individual to make money. Casino winnings are not an income source. ## Conclusion Online casinos make money because their games are designed to keep a percentage of everything wagered. The house edge sets what the casino can expect to keep, RTP shows what a game pays back, and total betting volume matters because winnings are often bet again. But the business is more than these percentages. Operators must pay game suppliers, fund bonuses and cover taxes, marketing, payments and other costs, and some periods bring bigger payouts than expected. Casino revenue and casino profit are not the same thing, and understanding the difference gives a much clearer picture of how online gambling works. ## Frequently asked questions ### Do online casinos make money from every player? No. Some players withdraw more than they deposit. The house edge ensures the casino profits across many bets, not from every individual. ### Does 96% RTP mean a casino makes 4% profit? No. A 96% RTP means a theoretical house edge of 4%. That is expected gross gaming revenue before costs, not the operator's net profit margin. ### Can an online casino lose money despite the house edge? Yes. Big wins, low betting activity, overheads and regulatory costs can all cause losses. ### Why do casinos offer bonuses if they cost money? Bonuses are a marketing tool to attract and keep customers. Casinos expect future business to justify the cost, but a promotion does not guarantee a profit. ## Sources 1. [UK Gambling Commission, How to calculate return to player (RTP)](https://www.gamblingcommission.gov.uk/licensees-and-businesses/guide/page/how-to-calculate-return-to-player-rtp?ref=mega888.international): theoretical and actual RTP, volatility and why results differ from expectations. 2. [UK Gambling Commission, Live RTP performance monitoring](https://www.gamblingcommission.gov.uk/licensees-and-businesses/guide/live-return-to-player-performance-monitoring-of-games-of-chance?ref=mega888.international): turnover, winnings and recycled winnings. 3. [UK Gambling Commission, How to calculate gross gambling yield](https://www.gamblingcommission.gov.uk/guidance/regulatory-returns-guidance/rr-guidance-how-to-calculate-your-gross-gambling-yield-ggy?ref=mega888.international): gambling yield, stakes, winnings and bonus treatment. 4. [UK Gambling Commission, Definitions of terms](https://www.gamblingcommission.gov.uk/about-us/guide/page/definitions-of-terms?ref=mega888.international): official definitions used in gambling regulation and reporting. 5. [Evolution, Annual Report 2024](https://www.evolution.com/wp-content/uploads/2025/04/Evolution-Annual-Report-2024.pdf?ref=mega888.international): how a game supplier charges operators fixed and variable fees.