Slots | HouseEdge

RTP is the long-run average. Volatility is how the ride feels.

A slot's outcome is chosen by a random number generator the instant you press spin; the reels just display it. Nothing you do changes the odds, but the machine's math decides how fast money leaves.

Penny slots kept

9.09%

Nevada statewide, 2025

Strip slot machines kept

7.83%

Las Vegas Strip, 2025

Nevada minimum payback

75%

by state regulation

Read a machine like a spec sheet

RTP · return to player: The share of all money wagered that a machine pays back over millions of spins. 92% RTP = an 8% edge. It says nothing about your next hour.
Volatility: How the return is packaged: many small wins (low) or rare big ones (high). Same RTP, very different sessions.
Hit frequency: How often a spin pays anything, including "wins" smaller than your bet.
Bet per spin: A “penny” machine rarely bets a penny; most spins cost dozens of credits. Check the total bet on screen, not the denomination.
Speed: About 600 spins an hour is typical. That's why a small edge on slots costs more per hour than a bigger one at a slow table.

Same RTP, different ride

Two simulated machines, both 92% RTP. Each starts with 100 credits and bets 1 credit a spin for 300 spins.

Low volatility · pays often, pays smallHigh volatility · long droughts, rare big hits