run the slots
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run the slots
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Convert between RTP and hold instantly, and see the real cost and swing of a session: the expected loss plus a 95% range so you know how wide the variance actually is.
RTP %
Return to player — change it and hold follows
Hold %
House edge — RTP and hold always sum to 100%
Bet Size
What you wager per spin
Spins
How many spins in the session
About the 95% Range
The expected loss is the long-run average cost. The 95% range is an approximate band showing that a single session can finish far better or far worse — variance dwarfs the edge over one sitting. It uses a symmetric Normal approximation, so the real upside tail is fatter than the band implies (rare jackpots), and finishing ahead on a single session is entirely possible.
Hold (House Edge)
12.00%
What the casino keeps over the long run — the flip side of RTP.
RTP
88.00%
Share of every dollar wagered paid back over time.
Expected Session Loss
$72.00
Long-run average cost: coin-in × hold. A single session can land far off this.
Coin-In
$600.00
Total wagered: bet × spins.
Best Case (95%)
$408.10
Top of the approximate 95% band — real jackpot upside is fatter still.
Worst Case (95%)
-$552.10
Bottom of the approximate 95% band for a single session.
Inputs
Return to player — share paid back over time.
House edge — what the casino keeps. RTP + Hold = 100%.
What you'll wager per spin.
How many spins in the session.
Per-spin standard deviation as a multiple of your bet. Higher = wilder swings.
RTP and hold are two views of the same number: RTP + Hold = 100%. Change one and the other follows. From your bet and spin count we get total coin-in, and the expected session loss is simply coin-in × hold — the long-run average cost of sitting down.
The 95% range is an approximate band around that average. Over a single session, variance dwarfs the edge — you can finish far better or far worse than the expected loss. Real slot outcomes are right-skewed by rare jackpots, so the true upside tail is fatter than this symmetric band shows.