When expressed on the same basis, house edge is commonly 100% minus theoretical RTP. A 96% RTP corresponds to a 4% expected house edge.
House edge is an expectation
A 4% house edge does not mean every 100-unit session ends with a four-unit loss. It describes the average mathematical advantage across a large volume of play.
Short-term results are governed by the game's outcome distribution. A player can win despite a house edge or lose despite a zero-edge mode.
Rules and bet choices change the edge
Blackjack decisions, roulette bet types, side bets and game configurations can use different mathematics. Quoting one headline edge without the applicable rules can mislead.
Use the active game information and strategy requirements rather than assuming all versions share the same return.
What zero house edge means
A genuine zero-edge mode has a 100% theoretical return before considering external costs or eligibility limits. It does not create positive expected profit.
Duel's eligible 100% RTP Originals are a real example. Availability gaps restrict continuous play but do not alter the mathematics of eligible rounds.
Turnover still creates session risk
Even a small edge compounds across repeated wagering, while zero edge still exposes the bankroll to variance. More rounds do not make an individual player due to win.
Set a loss limit before play and judge a game by rules and affordability, not by the possibility of recovering previous losses.