CS2 Crash Sites: Odds, House Edge and Martingale Maths

Crash is the simplest game on most CS2 gambling sites: a multiplier climbs from 1.00x and stops at a random point. Cash out before it stops and you win your stake times the multiplier. Wait too long and you lose the stake. It feels like a game of nerve. It is really a fixed probability curve with the house edge built in, and once you see the curve, most crash "strategies" stop making sense.

How crash works

Before each round, the game draws a crash point. Everyone in the round sees the same multiplier rise, and each player decides when to cash out. If you cash out at 1.80x on a $5 bet, you get $9 back. If the round crashes at 1.62x before you cash out, the $5 is gone.

The crash point comes from a random number. bustabit, one of the original crash games, publishes its formula in open-source code: take a uniform random number X between 0 and 1, compute 99 ÷ (1 − X), round down, and divide by 100. Using 99 rather than 100 is the 1% house edge. A few rounds bust at 1.00x before anyone can cash out, and every other crash point is shaved by the same 1%.

The odds at each multiplier

That formula gives a clean rule for any crash game with house edge h:

Chance the multiplier reaches x = (1 − h) ÷ x

With no edge at all, 2x would come up exactly half the time. Here is what 1% and 4% edges do to the common targets:

Sites set their own edge, and not every site prints it on the crash page. Look for it on the provably fair or help page. If a site will not tell you, assume it is not small.

Why no strategy beats the edge

Multiply the chance of reaching a target by the payout at that target and the x cancels out: (1 − h) ÷ x × x = 1 − h. At a 1% edge, cashing out at 1.5x returns 99% of your stake on average. So does 2x, and so does 10x.

Changing the target only changes the shape of your results. Low targets win most rounds and lose in occasional chunks. High targets lose most rounds and win in occasional spikes. Mixing targets, skipping rounds after a big multiplier or watching the history panel changes nothing either, because each round is drawn independently. The only number that matters for your long-run result is the edge times the total you wager.

That is why the total you wager matters more than the target you pick. At a 1% edge, wagering $1,000 over a session costs $10 on average. At 4%, it costs $40.

Martingale, worked through

Martingale means doubling your bet after every loss, so that the first win recovers everything lost plus your original stake. On crash, people usually run it at a 2x target. Start at $1:

• Win the first round: you bet $1, get $2 back, profit $1.
• Lose once, then win: you bet $1 and $2, get $4 back, profit $1.
• Lose twice, then win: you bet $1, $2 and $4, get $8 back, profit $1.

Every completed cycle wins exactly $1. The catch is how fast the losses grow. After n losses in a row you have lost 2ⁿ − 1 dollars, and the next bet is 2ⁿ. The chances below assume a 2x target and a 1% edge, so each round loses 50.5% of the time:

With a $1,023 bankroll you can survive nine losses and place a tenth bet. Ten losses in a row happens in about 1 cycle in 927. That sounds rare, but each cycle only wins $1. Per cycle, you win $1 with probability 99.89% and lose $1,023 with probability 0.11%, which works out to an average loss of about $0.10 per cycle.

Try to grind out $500 that way, one cycle at a time, and there is roughly a 42% chance a 10-loss streak wipes the bankroll first. The expected result of those 500 cycles is a loss of about $52. Maximum bet limits make it worse, because they cap how far you can double.

Auto-cashout

Auto-cashout lets you set the target before the round starts, and the game cashes you out when the multiplier reaches it. It is worth using for two reasons: it removes reaction time and lag from the result, and it stops you holding on for "just a bit more" once the multiplier is climbing.

It does not change the odds. A 2x auto-cashout at a 1% edge still wins 49.5% of rounds. Pair it with a fixed stake and a stop-loss you set before the session, and use the bankroll calculator if you want to see how long a budget lasts.

Provably fair verification

Crash is usually provably fair through a hash chain: the site generates a long chain of hashes in advance and publishes the end of it, then plays the chain backwards one round at a time. After a round, you can hash the revealed value and check it links to the previous one, then run the published formula to recompute the crash point.

That proves the crash point was fixed before anyone bet. It does not tell you the edge is low, or that the site pays withdrawals. Our provably fair guide shows how to run a check yourself.

Crash sites we partner with

These partners list crash among their games. Offers are what our link or code was reported to give on the date shown. Every one of these sites blocks some countries, so check the restricted list and the published crash edge before you deposit.

If you find yourself raising stakes to win back losses, stop. Our responsible gambling guide lists tools and support services.