To calculate your expected return in blackjack, you need to consider the house edge, which represents the casino's advantage. This edge typically ranges from 0.5% to 2% if you're playing with basic strategy. For example, if you're betting $10 and the house edge is 1%, your expected loss would be 10 cents per hand. If you're using advanced strategies like card counting, your return could improve, depending on the deck's composition. Additionally, the payout for a blackjack (3:2) affects your overall expected return, as it increases your winnings in the long run. Ultimately, expected return is a long-term average, and short-term results can vary significantly due to variance.