How much does the "en prison" rule actually increase your chances of winning?

[Mike_25]

The en prison rule slightly increases your chances of winning at roulette. When you bet on even chances like red or black and zero comes up, instead of losing your bet, you can have it "imprisoned" and held over for the next spin. This gives you an extra chance to win with that same bet. However, the extra chance is modest since zero still comes up fairly often at the wheel. My advice is focus more on smart betting and bankroll management rather than hoping the en prison rule bails you out of a losing streak. That rule is more of a nice perk than a real edge against the casino.

 

[Crazy_winner]

The house edge on even-money bets drops to roughly 1.35% when the "en prison" rule is in play. This indicates that compared to regular European roulette, the gambler has better probability of winning on certain wagers with this rule in place.