Key takeaways
- Average cost = stakes × house edge.
- Compare games.
- A long-run average.
- One session can differ widely.
The calculator
An average over a very large number of rounds. Online slots are capped at £5 a spin in Britain.
Reading the result
The average cost is what the game keeps in the long run. Tonight you might lose every pound staked or finish ahead. Use the figure to compare games and to choose a stake, not to predict a session.
Keep reading: How to play slots, How to play video poker and Live or software games.
Go further: How to claim free spins, How to play Sic Bo and How to play Megaways slots.
Offer terms were read from each casino's published conditions and dated 5 October 2026. Game rules and house edges are standard published figures. Casino details other than offers come from independent reviews; we have not opened real-money accounts. How we check. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
What will a casino session cost?
On average, your stakes multiplied by the house edge.
Which game is cheapest?
Blackjack with basic strategy.
Is this a prediction?
No.
What is house edge?
The share a game keeps over time.