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The Science Behind Online Casino Bonus Wagering Requirements

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Online casino bonuses are a popular way for online casinos to attract new players and keep existing ones engaged. These bonuses come in various forms, including welcome bonuses, deposit bonuses, and free spins. However, one aspect of these bonuses that often confuses players is the wagering requirement.

The Science Behind Online Casino Bonus Wagering Requirements
The Science Behind Online Casino Bonus Wagering Requirements

What is a Wagering Requirement?

A wagering requirement is a set of conditions that players must meet before they can withdraw their bonus or any winnings generated from it. It is usually represented as a multiplier, such as 10x or 30x, which indicates the number of times the bonus must be wagered.

The Science Behind Online Casino Bonus Wagering Requirements

The purpose of wagering requirements is to prevent players from simply taking advantage of the bonus and cashing out without playing any games. Online casinos would quickly go bankrupt if they allowed this. Wagering requirements ensure that players have to play through their bonus a certain number of times before they can access any winnings.

But what is the science behind these wagering requirements? How do online casinos calculate them? Let’s dive into it.

The main principle behind wagering requirements is based on probability and expected value. When players use their bonus to play games in an online casino, the outcome of each game they play is determined by a random number generator (RNG). The RNG ensures that the games are fair and unbiased.

Expected value is a concept in probability theory that predicts the average outcome of a situation when repeated over a long period. In the context of reels of joy crypto casino bonuses, the expected value is calculated based on the house edge of each game.

The house edge is the mathematical advantage that the casino has over the player in any given game. For example, in a game of Roulette, the house edge is around 2.7%. This means that, on average, the casino will win 2.7% of all bets made by players over time.

By multiplying the wagering requirement with the expected value, online casinos can estimate how much money they are likely to make from each player who claims a bonus. This calculation helps them determine the maximum bonus amount and wagering requirement they can offer without risking significant losses. 

Let’s consider an example. Suppose a player receives a 100% match deposit bonus of $100 with a 20x wagering requirement. The expected value is calculated by multiplying the bonus amount ($100) with the house edge of the game being played. If the house edge is 2.7%, the expected value would be $2.70.

To calculate the total amount the player needs to wager, we multiply the wagering requirement (20x) with the expected value ($2.70). In this case, the player would need to wager $54 before being eligible to withdraw any winnings.

Understanding the science behind wagering requirements can help players make informed decisions about which bonuses are worth claiming. It also emphasizes the importance of reading and understanding the terms and conditions associated with online casino bonuses to avoid any misunderstandings or frustrations.


In conclusion, wagering requirements in online casino bonuses are a necessary measure to protect the casino from potential losses. They are based on probability and the expected value of games, taking into account the house edge. Players should familiarize themselves with these requirements to make the most of their casino experience.