How does slot machines work? What is RTP in casinos, winnings in slot machines, method of calculating. Playing slots at online casino requires an extremely responsible attitude and understanding of the mechanism of what is happening. A person who is familiar with the working principle of slot machines, has no illusions about the probability of constant winning. The reason for this is the RTP (Return-To-Player) indicator, which guarantees the casino a long-distance winning.


RTP determines the percentage probability of winning.

More precisely, this indicator is a percentage of the total amount of betting money, which the slot machine plans to return to the players. Gamblers have the opportunity to increase the probability of winning through deposit bonuses provided by online casinos. Bonus funds allow extending the total duration of the game and increasing the aggressiveness of bets.RTP’s theoretical foundations The RTP indicator is not theoretical. On the contrary, this number is calculated in a practical way, depending on the number of placed bets and winnings. The method of calculating is based on calculations using spreadsheets and simulation of gambling situations. The final result of the calculations depends on the real gamblers who place bets on a single slot of online casino.

The higher the RTP, the higher the programmed level of recoil. At the same time, the set percentage will not affect the individual chances of winning for each individual gambler, as it is designed for a generalized result on the results of several million spins in a row. Thus, a high level of “return to player” does not guarantee a profit even playing it regularly. This is due to the presence of an additional factor called variance. This factor determines at what point the return will be made. It’s like a kind of lottery that serves to determine the lucky ones from the total number of participants.

The RTP level is not recommended as a crucial criterion when choosing a slot for the game. The exception is when the RTP of the device is severely understated. The standard level of the indicator for modern slots is 95-96%, so machines with RTP below 94% we recommend to bypass. A much more significant factor is the balance of the machine, the quality of game mechanics and design. It’s not worth paying attention to the promises of developers in terms of supervolatility, since the real chances of hitting the jackpot are slim to none.


Application of RTP in practice

Assume that the “return to player” index for a particular slot machine is 100%. In practice, such an idealized situation is impossible, because the slot will give just as much money as the gamblers have contributed to it, that is, the casino will not be able to earn a dime at the distance. This does not guarantee that each gambler will return his money back, as the index is calculated at a much greater distance than 5 or even 20 game sessions in a row. But one or more gamblers will definitely be lucky, because they will have to return the total amount of money loaded.

A common practice of casino is to use slots with RTP within 95-97%. These 3-5% of non-refund is a guarantee that the establishment will get a profit. The return parameter should be inscribed in the background information provided on the casino’s website, but there are some exceptions to this rule. As an example, the games that have been licensed on the Curacao Island are not required to disclose the parameter.

Use of variance Variance means a function that brings the element of randomness to the prize draw. It significantly complicates the mathematical calculations of the probability of winning, which requires luck to achieve. A positive variance for the gambler can bring a solid profit, which will provide him with a winning relative to the casino. But the owners of the establishment still do not remain in the red, because the equalizing coefficient RTP works on them in a long distance. Subsequent gamblers will lose, which negates the negative balance of the casino and provides the most guaranteed profit of 3-5% of the total number of bets on this machine.


Slot machine selection guidelines 

A mandatory indication of the RTP parameter in the reference file dedicated to the slot machine is relevant for establishments that operate under the licenses of Malta and the UK. At the same time, the games themselves should be licensed in Malta. Otherwise, the establishment is not obliged to inform the gambler about the technical parameters of the proposed slots.Most providers develop slots with a constant “return to player” value, but some of them provide an online casino with adaptive customization recoil depending on the market. In theory, this is necessary to compensate for a higher level of taxes, but in practice this technique is also used for banal increase in profitability.However, the high level of competition gradually displaces unscrupulous casinos, which expose an understated percentage of returns. Users simply leave them for more reasonable and authoritative establishments.

Our website presents only those online casinos that have not been seen in the underestimation of the return percentage and checked for compliance with the stated parameters.Key findings and observations:

  • Jackpot games are traditionally delivered with reduced RTP, which is due to the transfer of part of each bet to the jackpot pool;
  • Slots introduced by the NetEnt developer are licensed in Malta, so they have a traditionally high RTP level;
  • From the point of view of an individual game session, the most important thing for a winning is the variance, not the RTP;
  • Online gambling establishments offer users the slots with a significantly larger RTP parameter than terrestrial casinos. This is due to the high level of side-costs incurred by land-based companies.
RTP – how does slot machines work?