Written by
Marcus Hale
Editor, ReelTeller
Updated October 2026Next review November 2026
Two tools for the questions a casino lobby never answers. Each one runs in your browser, sends nothing anywhere, and shows its working underneath.
Calculators
Tool
RTP Version Cost
One slot, two RTP versions, compared in pounds over the play you actually do. Casinos rarely show you which version they run.
Tool
Bankroll Simulator
Ten thousand sessions run in your browser and shown as a histogram, because one average hides almost everything that matters.
Play with money you can afford to lose. Casino games are built to return less than is staked over time. Set a budget and use your account's deposit limits. Free, confidential support is available from GamCare on 0808 8020 133. More on staying in control.