It is calculated by multiplying the bet per line by the number of paylines selected. For example, if a player bets $1 on each of the 20 active paylines, the total bet for that spin would be $20. This figure may also include additional features or bonuses in some slot games.
Total Bet Example
For example, if a player chooses to bet $0.50 on each of 30 paylines, the total bet for that spin would be $15.