A Guide to Casino House Edge

Casino house edge sits at the heart of every casino game. It’s the percentage of each wager the operator retains on average, built into every game's design.  

This guide walks you through what house edge means, how it works, and what to look for across our selection of online casino games. 

What Does House Edge Mean in Casino Play? 

We’d love to tell you there’s a cool secret to how casino games work, but the truth is much simpler: it’s all in the maths. (But really cool maths.)  

The 'house edge' is simply the takings that the casino keeps from a game over the long run. If a game carries a 3% house edge, the casino expects to keep £3 from every £100 wagered across a massive number of plays, returning £97 to players. 

Does this mean every online gambling session goes exactly like that? Not at all. Short-term results are completely random - you might sit above or below that average on any given day.  

Think of house edge as an online casino site’s long-term cost of doing business. Every reputable UK casino site, including Virgin Games, publishes their house edge figures for each game, in line with the UK Gambling Commission’s guidance.  

So, the house edge might not be the exact same for your next spin, but the overall trend figures are clear. And always visible before you play.  

How Casino House Edge Works 

Let’s look at European roulette as an example of house edge in action. A standard single-zero roulette wheel has 37 pockets numbered 1-36, plus the zero.  

Your true mathematical chance of landing on your chosen number is 1 in 37. Therefore, in a scenario with no casino house edge, your £1 winning bet would return £37. 

But when a winning bet lands in reality, the payout is 35 to 1. That slight gap between the true odds and the payout? That’s the house edge in action. (Yes, we know what we’re doing.) 

It isn’t just European roulette that has a casino house edge. Every type of casino game uses a similar setup. The payouts sit just a fraction shy of the true odds, and that difference creates the casino's mathematical advantage (AKA “house edge”).  

On slots, this is built right into the programming, with every single spin produced completely at random by our Random Number Generator software. 

If you're new to how casino games all work, it's a solid idea to learn the ropes of how online casino games play before you start comparing the house edge figures. 

House Edge vs RTP: Two Sides of the Same Coin 

Return to Player (RTP) and house edge? They’re the flip side of the same coin. If a slot has a 96% RTP, the house edge is 4%. They always add up to 100%. 

We usually lead with RTP because, frankly, '97% back to players' sounds a lot clearer than '3% to the casino' (we know what you’re looking for). But the maths doesn't change.  

You’ll usually find the RTP figure tucked into the game info or paytable of any online casino game. If a game doesn't show one? Well, that's a fair reason to look elsewhere. 

Online Casino House Edge and How It Compares 

The big question: Online casinos or land-based casinos? When it comes to the house edge, this is a serious question. And we’ve got the answer. In short? If you’re looking for the place to play with the lowest house edge; online casino sites are for you. 

Online casino house edge tends to sit lower than what you'd find in a physical venue. Without the overheads of operating a casino floor (and the electricity bill for all those flashing lights), online games operate a little differently – and a little cheaper. That means some of those savings can work their way to you, with lower house edges and higher RTPs. 

Online casino table classics like online blackjack and baccarat generally sit at the lower end of the scale. Slot games vary a bit more, and progressive jackpot slots typically run higher - purely because a slice of every spin feeds into the shared jackpot prize pool. 

The version of the game matters, too. A standard European roulette wheel has a lower edge (usually around 2.70%) than the American version (which can reach 5.26%!), thanks to that extra double-zero pocket.  

And if you fancy placing side bets on blackjack or baccarat? Just keep in mind they usually add a heavier edge on top of the base game. 

Why House Edge Matters for Your Play 

What’s the big deal with house edge? Two reasons. 

First, house edge is a long-term average, not a crystal ball for your current session. Over tens of thousands of rounds, the numbers work out. Over ten minutes? Who knows – that's the thrill of the game, and that’s entirely down to the Random Number Generator. 

Second, knowing how the edge works helps you pick the right game for your style and casino bankroll budget. Skill-based casino games often sit at the lower end of the house edge scale, which is a brilliant place to start. Slot outcomes, on the other hand, are entirely random. No perfect timing or secret pattern changes the result. 

Pick what you enjoy, set your limits, and play at your own pace. All thrill. No fuss. 

Play on Your Terms at Virgin Games 

At Virgin Games, every casino game is licensed, tested, and clear on the numbers that matter to you. RTP figures are published in the paytables where you'd expect them, alongside all the casino minimum wagering requirements information and the exciting stuff like bonus round triggers. 

Prefer to play on the move? The Virgin Games mobile casino app brings the full selection of our online and live casino games to your phone or tablet, with the same information and controls you'd get on desktop. Set your spend limits, check the paytables, and play in the way that suits you. 

The house edge? Built in. The play? Yours. 

Whether you’re pulling up a seat for blackjack and roulette, or exploring our wide collection of online slots, you'll find the key figures published on every game. Explore our games today.

All offers mentioned correct at the time of writing but may be subject to change.