The Mathematics Behind Casino House Edge

Every single game on a casino floor is meticulously designed with a built-in mathematical advantage for the operator.


This mathematical advantage is universally known as the 'house edge,' and it is the secret to their massive profits.

How the House Edge is Calculated

Casinos make their money by paying out slightly less than the true mathematical probability of a win.


The presence of the green zero on the roulette wheel is what creates the house edge on all even-money bets.

This slight discrepancy in payouts guarantees that the casino retains a small percentage of all money wageredA 2% house edge means the casino expects to keep two dollars out of every one hundred dollars betOver millions of spins, this tiny percentage translates into billions of dollars in guaranteed revenue
The Flip Side of the House Edge

In the digital world, software providers use the term RTP to explain the theoretical payout of a game.


An RTP of 95% indicates that the machine is programmed to pay back $95 for every $100 wagered over its lifetime.

Game CategoryStandard EdgeImpact on BankrollBlackjack (Perfect Strategy)0.50%Very slow drainPenny Slots10.00%+Rapid drain

You cannot defeat the math, but by choosing games with a low edge, you can play much longer for the same price.