How do pokies work? The RNG, RTP and volatility behind every spin

How do pokies work? The RNG decides every spin

Every online pokie runs on a random number generator, or RNG. When you press spin, it produces the result on the spot, and the spinning reels are only the display. Each spin stands alone: the RNG doesn’t know what happened last spin, what your balance is or what time it is.

What makes one pokie different from another is the maths built into the game: how often each symbol can land and what the paytable pays for it. That maths produces four numbers worth knowing before you bet. The game’s info screen shows the RTP and often the volatility; for max win and hit rate you may need the studio’s own site or a game database:

For quick definitions of the other paytable words, see the casino glossary.

What RTP means: 100 spins vs 1 million

RTP is an average over the game’s whole life. A pokie at 96.5% keeps A$3.50 of every A$100 bet across millions of spins. For one session, the expected cost is stake × spins × (100% minus RTP): 100 spins at A$1 on a 96.5% pokie cost A$3.50 on average, and 1,000 spins cost A$35.

The catch is the word average. To show how far a real session strays from it, we built two model pokies. They aren’t real games, just the simplest way to isolate the effect. Both have the same 96% RTP:

We worked out the odds for each at A$1 a spin. Here’s what players would see:

Both models cost A$4 per 100 spins on average. That’s the RTP at work, and everything else in the table is volatility. On the spiky model, being ahead after 1,000 spins comes down to one event, whether the 1,000x landed, which happens in about 30% of sessions. Even after a million spins its return can sit anywhere from 92.2% to 99.8%, because a few big hits more or less move the total.

One more wrinkle: the same game can ship at more than one RTP. Play’n GO’s own data lists Book of Dead at five settings, from 96.21% down to 84.18%. The game’s info screen shows which one you’re playing, and our best paying pokies list covers the titles and versions worth choosing.

Volatility and hit rate: why two 96% pokies feel nothing alike

Volatility is how the RTP gets delivered. The steady model pays often and small, with a top prize of 5x. The spiky model misses 84 spins in 100 and saves its return for rare big hits, including a 1,000x that lands about once in 2,778 spins.

One number shows the trade. Take A$100 at A$1 a spin and play until it either doubles to A$200 or runs out. On the steady model it doubles 0.5% of the time. On the spiky model it doubles 10.7% of the time, and the price is that most spiky sessions end much sooner. How long each budget lasts at different stakes is in the bankroll table of our pokies tips.

Hit rate is the other half, and it can mislead. Sweet Bonanza 1000 hits on 42.92% of spins, yet Pragmatic rates it 5 of 5 for volatility. Divide its RTP by its hit rate and the average hit is about 2.25x the bet, and that average includes the rare 25,000x, so the typical hit is smaller still. Big Bass Bonanza 1000 hits only 13.19% of the time, and its average hit works out to about 7.3x.

To check volatility yourself, open the paytable. Pragmatic Play shows a meter of five lightning bolts: Sweet Bonanza lights 4 of 5, Gates of Olympus 5 of 5. BGaming and Belatra use words such as “medium-high” and “very high”.

Real pokies at SafeCasino, by the numbers

All seven of these were in SafeCasino’s catalogue when we read it from outside Australia on 18 and 19 Sep 2026:

RTP, volatility, top win and top-win odds come from the studios, with Pragmatic’s figures read from its own game builds. Hit rates for the Pragmatic titles come from independent game databases; BGaming publishes its own.

The last column is the sobering one. Gates of Olympus 1000’s 15,000x comes about once in 2.75 million spins. At 600 spins an hour, that’s roughly 4,600 hours of non-stop play for one expected hit.

It also answers the A$10,000 question. On a A$1 spin you need a 10,000x win. Gates of Olympus and Sugar Rush cap at 5,000x, so they can’t pay it at that stake, while Gates of Olympus 1000, Big Bass Bonanza 1000 and Sweet Bonanza 1000 can. On a A$2 spin you need 5,000x, the very top prize of Gates of Olympus and Sugar Rush. The Gates of Olympus guide compares all three versions of that game.

Pokie myths the maths rules out

People ask how to tell if a pokie is going to pay. You can’t, and these five beliefs are why so many think they can.

“It’s due to pay”

Each spin is independent. After 50 dead spins on Big Bass Bonanza 1000, the next spin still hits 13.19% of the time, exactly as it did on spin one.

“This pokie is hot, or cold”

Streaks are what randomness looks like. With a 13.19% hit rate, any 10 spins in a row all miss about 24% of the time. A cold patch isn’t a signal, and neither is a warm one.

“A near miss means it’s close”

Two scatters with the third just above the line feel like a near thing. The result was fixed the moment you pressed spin, and a near miss says nothing about the next one.

“The casino tightens it after a big win”

A pokie’s RTP comes from the game version installed, and the rules screen tells you which version that is. It isn’t a dial that turns mid-session in response to your balance.

“Autoplay and turbo pay less”

Same RNG, same RTP. What changes is speed, and speed raises the hourly cost: at 600 spins an hour, A$1 spins on a 96% pokie cost about A$24 an hour on average. Our responsible gambling page has the figures for other stakes.

Using RTP and volatility to choose a pokie

Start from what you want out of the session, then pick the numbers that fit it:

Pokies count 100% toward SafeCasino’s x40 wagering, and higher RTP lowers what clearing it costs; the wagering requirements guide does that sum for you. Feel matters too, and demo mode is the cheapest way to learn it: every game at SafeCasino has one. A hundred demo spins on each of two pokies you’re weighing up will tell you more than any review, then open the SafeCasino pokies lobby and play the one that suits your budget. The online pokies hub sorts the lobby by type if you want more options.