Casino Loss Calculator
Work out your expected loss per hour and session based on bet size, game pace and RTP.
Fill in bet size, rounds per hour, session length and RTP to see your expected loss.
This shows the statistically expected loss over the long run (the house edge). In any single session the actual result can be better or worse due to variance. Play responsibly.
Every game on a casino has a built-in house edge — the share of your stake that statistically ends up with the casino over time. This calculator shows what that actually means in real money for you, based on your bet size, how fast you play, and the game's RTP (return to player).
How we calculate your expected loss
The formula is straightforward: expected loss = bet size × rounds per hour × hours × (1 − RTP). RTP is given as a percentage — a slot with 96% RTP keeps 4% of every unit wagered on average (1 − 0.96 = 0.04), over enough rounds.
Game pace varies a lot between games. Slots spin fastest at around 400 spins per hour, roulette runs about 40 spins per hour, and blackjack around 70 hands per hour. The more rounds per hour, the more money passes through the house edge — even when the RTP is high.
Worked example
Say you play slots at 10 per spin, around 400 spins an hour, on a slot with 96% RTP. The house edge is 4% (1 − 0.96). That gives: 10 × 400 × 0.04 = 160 in expected loss per hour.
Play for two hours and your expected total loss is 320 — even though you only "risk" 10 per spin. Compare that with blackjack: 100 per hand, 70 hands an hour and 99.5% RTP gives just 35 in expected loss per hour, thanks to the much thinner house edge and slower pace.
Frequently asked questions
Does this mean I'm guaranteed to lose exactly this amount?
No. This is a statistical average over a very large number of rounds, not a guarantee for any single session. In reality, individual sessions are governed by variance — you could win big or lose faster than the calculation shows. The more rounds you play, the closer the actual result tends to land to the expected value.
Why isn't RTP the same as your chance of winning?
RTP (return to player) is a long-run average across millions of rounds, not a promise about individual outcomes. A slot with 96% RTP can still hand you a big win on the very first spin, or nothing at all across a hundred spins in a row — RTP only describes what evens out statistically over time.
Can I trust the RTP figure listed for a game?
RTP is tested and certified by independent labs and should match what the game provider states — but it can differ between versions of the same game and between casinos. Always check the RTP in the game's rules (usually under "info" or the paytable) before setting a budget, rather than relying on a general rule-of-thumb figure.
