Maths of online casino slot machines

Maths of online casino slot machines


Maths of online Casino slot machines


All slot machines are machines designed for casinos to make money. In fact, this is a kind of analogue of entertainment attractions, only the fee for their use is charged not by the hour, but in a slightly more complicated way. They are designed to return to players a certain part of the bets they make. More precisely, they hold a certain percentage of the total amount, returning the rest in the form of payments.

If we talk about modern online casino slot machines, then the theoretical return is laid in them by the manufacturer during software development. It can fluctuate in a very substantial range. The best models give back more than 98%, and the least profitable can return even less than 90%. (In the latest devices, this indicator most often ranges from 94% to 97.5%.) It is important to understand that this indicator appears on a long segment of the game. Otherwise, there would be no sense in betting with real money, because the result would be predetermined in advance. The longer the game runs on the video slot, the closer its winnings are to the planned result.

Process features


All online slot machines use a random number generator, due to which the result of each draw is unpredictable.

In fact, it operates on the basis of a very complex algorithm, so the word “random” in this case is not entirely true. However, in practice, it is not possible to decipher the principles of its work (in any case, if we talk about models of well-known manufacturers). In the process of the game it looks as follows:

When you press the Spin button, the RNG selects a combination of numbers, which are assigned to certain characters that appear on the screen. In mechanical slot machines, the reels with pictures really rotated, but here they actually are not. They are simply displayed on the screen to create a realistic picture. In a modern game with five reels, there may be several tens of millions of possible patterns for arranging pictures.

The theoretical return of an online video slot cannot be calculated independently, therefore, it remains only to rely on official data from the manufacturer and tests conducted by independent experts.


What to pay attention to?

How to choose a casino slot? Here are some suggestions:

  • When choosing a slot machine for playing at real rates, always try to clarify the level of theoretical return;
  • Also check the odds table. If only one or two combinations are paid at high rates, and the rest have very low multipliers, most likely you will need a more solid bankroll, because there is a high probability of a prolonged black line. The same can be said about models with a small number of lines and a small selection of various functions;
  • Also consider the range of bets.




Slot machines are one of the simplest varieties of gambling. They do not require special skills. You just need to choose the most profitable and interesting model, using our tips, and enjoy the process.

If this is enough for you, do not bother yourself with the details. But if you are inquisitive and want to understand all the nuances, such publications will be useful to you.