House edge calculator
Choose a game, a stake and a number of rounds to see what a session costs on average.
By Ryan Jessop. Last checked .
Key takeaways
- Average cost = stakes × house edge.
- Blackjack is cheapest; slots vary.
- A long-run average.
- Use it to compare games.
The calculator
Typical house edges. Blackjack assumes sound basic play. A single session can end far above or below the average.
The same £100 on five games
| Game | House edge | Average cost |
|---|---|---|
| Blackjack | 0.5% | £0.50 |
| Baccarat, banker | 1.06% | £1.06 |
| European roulette | 2.70% | £2.70 |
| Slot at 96% | 4% | £4 |
| American roulette | 5.26% | £5.26 |
Speed matters too
Slots can run 600 spins an hour at a relaxed pace; a live roulette table perhaps 40 spins. A lower edge on a faster game can still cost more per hour.
Background: RTP and house edge.
More tools: Casino finder: which online casino is best? and Compare online casinos.
Worked examples
| Game | Stake | Rounds | Total staked | Average cost |
|---|---|---|---|---|
| Blackjack | £2 | 60 | £120 | £0.60 |
| European roulette | £1 | 40 | £40 | £1.08 |
| Slot at 96% | 20p | 600 | £120 | £4.80 |
What it cannot tell you
How a session will end. The figure is a long-run average; on any one evening the result can be far better or worse.
Go further: Casino game odds, Low wagering casino bonus UK, Casinos for beginners UK and UK online casino rules.
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Offer terms dated 5 October 2026, from each casino's published conditions. Other casino details are reported by independent reviews. How we check. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
What is house edge?
The casino's long-run share of stakes.
Which game is cheapest?
Blackjack.
Does the calculator predict results?
No.
Why do slots cost more?
Higher edge and faster play.