This is an educational guide to how UK online gambling works. Figures such as RTP and house edge are typical industry values and vary by game and operator. No game can be beaten in the long run — play for entertainment, never as a way to make money, and only stake what you can afford to lose.
What Is the House Edge?
The house edge is the single most important concept in gambling maths. Understand it, and you understand how casinos work. Here it is, simply.
The built-in advantage
The house edge is the mathematical advantage the casino holds on a game — the percentage of all stakes it keeps, on average, over time. On a game with a 4% house edge, the casino expects to keep about £4 of every £100 staked across the long run.
The flip side of RTP
House edge and RTP are two sides of one coin and always add to 100%. A 96% RTP is a 4% house edge; a 99% RTP is a 1% edge. Lower-edge games give your money a better chance of lasting.
Can you beat it?
Not over the long run — the edge is baked into the game’s maths, so the longer you play, the more it asserts itself. But because it’s an average, short-term wins are entirely possible, which is exactly why people win individual sessions. See RTP vs house edge, what RTP means and how online casinos make money.
Frequently asked questions
What is the house edge?
The built-in mathematical advantage the casino has — the percentage of stakes it keeps on average over time.
How does it relate to RTP?
They’re two sides of one coin: a 96% RTP means a 4% house edge.
Can you overcome the house edge?
Not over the long run — it’s built into the game maths, though short-term wins are still possible.
Related guides: RTP vs house edge, what RTP means and how online casinos make money.