# Understanding the House Edge at a Casino

Casinos are businesses that earn money from customers betting on games of chance and skill. In most casino games, the house has an edge over the players. This edge is called the house edge and is usually expressed as a percentage. If the house edge is low, then the casino will make a small profit. If the house edge is high, then the casino will make a profit of 15 to 40 percent.

The casino uses elaborate surveillance systems to monitor its patrons and games. Cameras in the ceiling and windows record every move made by patrons. The feeds can be reviewed later if suspicious behavior is detected. The payouts of slot machines are controlled by the computer chips inside them. This eliminates the need for security guards to keep watch over the slot floor.

The house edge of casino games varies, and a basic understanding of probability can help you win. This does not require a math degree, but it can help you make informed decisions about how much you should be betting. In casino games, there are generally two ways that probabilities are expressed: in percentages, or in decimals.

To avoid falling victim to this house edge, you should know how the house edge works and how much cash a casino needs for its operations. In addition to calculating the house edge, casinos must determine the variance of the games, which tells them how much profit they can expect to make. These mathematical calculations are done by mathematicians and computer programmers called gaming analysts. Casinos often do not employ in-house experts in these fields, so they outsource the work to experts.