Finding the Pay Back Percentage of Slots You just learned about payback percentage and the house edge and how these things guarantee the casino a profit. So the next question is how do you find out the house edge and payback for slot machines? Most casino games are designed in pg slot pg slot a way that it’s fairly easy to determine the house edge and payback percentage. You can easily find the numbers with a quick internet search. But slots are different. The programs that run the machines have a lot of variables. You would need to access the program itself to determine the house edge and payback percentage. Another problem is that some machines offer different payback percentages from the manufacturer. This allows each casino to order their machines with the percentage they want.