Slots RTP & Loss Calculator
What an RTP really costs you per hour.
How it works
A slot's RTP (return to player) is the percentage of all money wagered it pays back over the long run. The rest — 100% minus RTP — is the house edge. At 96% RTP the house keeps 4% of everything you bet, on average, spin after spin.
Your expected loss is bet × house edge × spins, and slots spin fast — 500–800 per hour — so the cost adds up quickly even at small stakes. This calculator turns an RTP figure into the real money it costs you per hour and per session.
Slots RTP & Loss Calculator
Every slot is defined by its RTP — the percentage of all wagers it returns over the long run. This free slots calculator turns that number into what it actually costs you: the house edge, and the expected loss per hour and per session at your stake and spin speed.
RTP and house edge
RTP (return to player) is the share of all money bet that a slot pays back across millions of spins. The house edge is the rest: 100% minus the RTP. A 96% RTP machine keeps 4% of everything wagered on average — not 4% of your deposit, but 4% of total turnover, which is far larger because winnings get re-bet.
RTP is a long-run average, so any single session can swing far above or below it. Over enough spins, though, results converge on the edge with near-certainty.
Why the per-hour cost is high
Slots are fast. At 500–800 spins an hour, even a small bet turns over a lot of money, and the house edge applies to every spin. Expected loss is bet × house edge × spins, so a £1 spin at 96% RTP and 600 spins an hour costs about £24 per hour on average.
This calculator makes that cost explicit, which is the most useful thing RTP can tell you: not whether you will win tonight, but what the game charges you for the entertainment over time.
What does RTP mean?expand_more
Return to player — the percentage of total wagers a slot pays back over the long run. A 96% RTP means a 4% house edge on every spin's turnover.
How do you calculate expected loss on slots?expand_more
Expected loss = bet × (1 − RTP) × number of spins. At £1 a spin, 96% RTP and 600 spins per hour, that is about £24 per hour.
Does a high RTP mean I will win?expand_more
No. RTP is a long-run average across millions of spins; a single session can land anywhere. A higher RTP simply means a smaller average cost over time.