Free tools
RTP Tools & Calculators Turn RTP Data Into Decisions You Can Act On
Knowing a slot's RTP is one thing; knowing what that percentage costs you over a real session is another. These five tools convert the numbers we track into figures you can actually use โ expected returns, house edge, bankroll planning, bonus costs and side-by-side comparisons. All of them are live and free to use.
Enter an RTP, stake and spin count to see your total wagered, expected return, expected loss and the house edge in pounds.
Open โSimulate a session spin by spin and graph the balance, to see how long a bankroll lasts at a given stake, RTP and volatility level.
Open โPut up to four slots side by side and compare max RTP, best live RTP, volatility, max win and provider in a single table.
Open โWork out the true cost of a bonus: total turnover required, expected loss while clearing it, and whether the offer is worth taking.
Open โSet a session budget and get a suggested stake size and spin count, so your balance lasts as long as you intended it to.
Open โWhy use a calculator at all?
RTP is expressed as a percentage, and percentages are easy to underestimate. The difference between a 96.71% build and a 94.51% build sounds trivial โ barely two points. Run it through the calculator at ยฃ1 a spin over 10,000 spins and it becomes ยฃ220. Same game, same session length, different casino.
That's the whole purpose of these tools: to move RTP out of the abstract. Everything here works off the same data we publish across the site, and every figure is a long-run theoretical average rather than a forecast for your next session. A calculator can tell you what a game costs on average over a very large number of spins โ it cannot tell you what will happen tonight, and no tool that claims otherwise is being straight with you.
Start with the RTP Comparison Tool to narrow down which slot you want, run the numbers on it in the RTP Calculator, then use the slot database to find which casinos actually run the higher build of the game you've picked. If a casino is offering you a bonus to sign up, put it through the Wagering Calculator first โ at a standard 35x requirement, most bonuses cost more to clear than they're worth. And before you play at all, set your limit with the Budget Calculator: deciding the budget first and letting it set the stake is the one habit that keeps a session the size you meant it to be.
Frequently asked questions
Can these tools tell me whether I'll win?
Where do the numbers behind the tools come from?
Which tools are available, and what's coming next?
Written by Jon Pill, Senior Editor ยท Reviewed by Mark Gruetze ยท Last updated Jul 2026