Slot Payout Percentages

  I noticed that some of the slots have a payout percentage ranges listed in the descriptions and the rival descriptions have a set one listed,  I was wondering if they are accurate? 

Payout percentages vary, but the law requires more than 75%, so most casinos give between 90% to 97% payback

Slot machines are typically programmed to pay out as winnings 82% to 98% of the money that is wagered by players. This is known as the "theoretical payout percentage" or RTP, "return to player". The minimum theoretical payout percentage varies among jurisdictions and is typically established by law or regulation.

2 random wiki/google results


The winning patterns on slot machines – the amounts they pay and the frequencies of those payouts – are carefully selected to yield a certain fraction of the money played to the "house" (the operator of the slot machine), while returning the rest to the players during play. Suppose that a certain slot machine costs $1 per spin. It can be calculated that over a sufficiently long period, such as 1,000,000 spins, that the machine will return an average of $950,000 to its players, who have inserted $1,000,000 during that time. In this (simplified) example, the slot machine is said to pay out 95%. The operator keeps the remaining $50,000. Within some EGM development organizations this concept is referred to simply as "par". "Par" also manifests itself to gamblers as promotional techniques: "Our 'Loose Slots' have a 93% payback! Play now!" It is worth noting that the "Loose Slots" actually may describe a very few anonymous machines in a particular bank of EGMs.

A slot machine's theoretical payout percentage is set at the factory when the software is written. Changing the payout percentage after a slot machine has been placed on the gaming floor requires a physical swap of the software or firmware, which is usually stored on an EPROM but may be loaded onto non-volatile random access memory (NVRAM), depending on the capabilities of the machine and the applicable regulations. Based on current technology, this is a time-consuming process and as such is done infrequently


ps EGM=electronic gaming machine

hope this helps

I accualy found the equasion for figuring out the return on slots.  That is if you take the probibility of any given combonation times the payout and add them all together.  That is the math.  Of course that is with your standard reel machine.  In online video slots I have noticed that the reels do change (thus adjusting the payout percentage).  I am starting to keep track of how many scater and wilds there are on each reel.  That way when the reels have more wilds/scatters I know that the time to play.

For microgaming espically this helps.