How to Calculate the House Edge of a Slot Machine

The basic mechanism of a slot machine is the same whether played for fun or for real money. Upon activation, a lever or button spins the reels, and if the symbols match, the player wins credits based on the paytable. Depending on the theme, symbols may range from bells to stylized lucky sevens to fruits. The majority of slot machines have a specific theme, and bonus features generally align with the theme.


Symbols in slot machines can be either fruits, one-armed bandits, or numbers. While the former are more common, online slot machines have the advantage of being more appealing to players. Fruit symbols have been used for decades to address slots and one-armed bandits, and are often found in online and land-based games. These symbols were originally used to get around new laws regulating cash-paying slot machines and were considered to be a socially acceptable form of gambling.


Many people want to know the exact payout percentage of a slot machine before playing for real money. The truth is, payouts on slot machines vary considerably. In general, machines with a $1 denomination will pay out 95% or higher. Machines with a 25-cent denomination will pay out around 92%. But casinos that advertise payouts of up to 99.5% may simply be using standard machines. Payout percentages are also usually posted in the help menu of the machines, or you can search online.

House edge

Every slot machine has a house edge. Some take as little as 1%, while others take up to 15%. Calculating the house edge is an intricate process, but one that Giora Simchoni illustrates with R script. In the video below, Giora shows how the house edge of a slot machine is calculated. The result may surprise you! Nevertheless, the house edge is something that you should know about if you plan to play slots at a casino.

Multi-line slot machines

There are two main types of slots, single-line and multi-line. Single-line slots have one payline. Multi-line machines, on the other hand, have multiple paylines. The more paylines you have, the higher your chances of winning. Multi-line slots are more complex and often have more features. The pay table for multi-line slots is more complicated than that of single-line machines, but they generally offer more opportunities to win.

Tilt switches

Tilt switches are used to detect the angle of an angled movement on one axis. These tilt switches are built using reed switch technology, making them robust and mercury-free. The switch is located near the flipper mechanisms. You may also encounter a tilt light that is intermittent. A business card wedged into the microswitch can fool the machine into thinking that the hopper is full. Another solution is to push the timer reset bar under the hopper. The hopper can be triggered, and the player will be rewarded.

Roll-up buttons

Slots with roll-up buttons are a fun way to bring the circus into your online casino. This game has everything from fire eaters to tightrope walking elephants, trapeze artists to a ringleader in a lion’s mouth. You’ll also be able to see ice cream, toffee apples and popcorn as you play. The best part is that you can get in on the action by winning real cash prizes!

Precommitment technology

For those who are addicted to the casino game, a new precommitment technology may be the answer. This technology allows players to set a spending limit before they play, and will alert them when they’ve reached that limit. This technology was developed with funding from new casino licensees. The benefits are clear: a player will be able to spend only as much as they have set. At the same time, they can manage their money.