Return to Player (RTP) algorithm in a slot game

Blog post description.

5/25/20231 min read

The Return to Player (RTP) algorithm in a slot game is a mathematical calculation used to determine the percentage of total wagered money that a slot machine will pay back to players over time. The RTP value represents the long-term expected payout percentage of the game.

The specific algorithm used to calculate the RTP may vary depending on the game developer or the regulations in a particular jurisdiction. However, the general concept involves considering the probabilities of different winning combinations and their corresponding payouts.

Here is a simplified explanation of how the RTP algorithm can work:

Determine the probabilities: Each symbol on the slot machine's reels has a specific probability of appearing. The algorithm takes into account these probabilities for all the symbols and their positions on the reels.

Assign payouts: Every winning combination has a designated payout value. The algorithm determines the probability of each winning combination occurring and multiplies it by the corresponding payout amount.

Calculate the total expected payouts: The algorithm sums up the expected payouts for all possible winning combinations.

Calculate the total wagered amount: The algorithm considers the average bet size or the range of bet sizes allowed in the game and calculates the total amount of money wagered over a specified period.

Calculate the RTP: The algorithm divides the total expected payouts by the total wagered amount and converts it into a percentage to determine the game's RTP value.

It's important to note that the RTP value represents the statistical average over a large number of spins, and individual results can vary significantly in the short term. Additionally, the RTP does not guarantee specific outcomes for individual players but rather provides an indication of the game's long-term payout performance.

Game developers and regulators often subject slot games to rigorous testing and certification processes to ensure fair and transparent RTP values.