How Megaways Slots Work: Variance & Volatility Explained

If you've spent any time browsing online slot games, you'll have come across the terms variance and volatility. They get used a lot, sometimes interchangeably, sometimes as though they mean entirely different things.

Understanding what they actually refer to, and how they relate to RTP, gives you a clearer picture of how any slot game is likely to behave before you spin.

Variance and volatility: what's the difference?

You'll often see these two terms used as synonyms, and in practice most players treat them that way. They are closely related, but they're measuring slightly different things.

Variance describes the overall spread of a game's payouts over the long run: how much the results deviate from the average across a whole session or longer. Volatility describes how those swings feel in the short term: how often wins land and how significant they are when they do.

Think of it like a long motorway journey with a 60mph cruise control as your baseline. If you spend the whole trip alternating between 50mph and 70mph, your overall deviation from that baseline is measurable across the whole journey. That's the variance.

But if you're constantly flooring it to 80mph and then braking hard to 40mph, the speedometer needle is swinging wildly on every stretch. That's the volatility. One captures the total spread of the trip; the other captures how sharp the swings are in the moment.

In slot gaming, volatility tends to be the term you'll encounter most. Variance is the longer-term picture that emerges from it. For most purposes, either gives you a reasonable sense of what to expect from a game.

What is RTP?

RTP stands for Return to Player. It's a percentage that represents how much a slot is designed to pay back over a large number of spins. A game with an RTP of 96% will, in theory, return £96 for every £100 wagered across its lifetime, though that figure plays out over millions of spins, not a single session.

It's worth knowing that RTP and volatility aren't directly linked. A high-RTP game can be high or low volatility, and the same goes for low-RTP games. The RTP tells you about the average return over time, while the volatility tells you how that return is distributed.

A high-volatility game with a strong RTP might go long stretches without paying out, then land a significant win. A low-volatility game with the same RTP might pay out smaller amounts much more consistently.

Low, medium and high variance: what to expect

Slot games are typically categorised as low, medium or high variance, and the same scale applies to volatility. Here's what each level generally means in practice:

Low variance

Low variance slots pay out more regularly, but the individual wins tend to be smaller. The ride is steadier. Less dramatic, but more consistent.

Medium variance

Medium variance sits in the middle ground. Wins come less frequently than in low variance games, but the potential returns are higher when they do land. It's a balance between the two ends of the scale; neither the consistency of low variance nor the peaks and troughs of high.

High variance

High variance slots can go longer between wins, but those wins can be significantly larger when they arrive. Sessions can have extended quiet periods, but the bonus potential tends to reflect the wait. These games have a different rhythm to low variance titles, and one that suits players who are comfortable with that kind of ebb and flow.

Who sets a game's volatility?

The developers do. Volatility is built into a game's code, which means the studio behind it is best placed to categorise it, and it's worth knowing that how developers define high, medium or low volatility can vary from studio to studio.

If you want to check a game's volatility before you play, the best place to look is the game's paytable, as most titles include it alongside other key information like RTP and minimum and maximum stake amounts.

Megaways slots and why volatility matters there

Now that variance and volatility make sense, it's worth talking about Megaways. Understanding the format starts with understanding why these games sit firmly at the high-volatility end of the scale.

Megaways slots use a random reel modifier that changes the number of symbols on each reel with every spin, which in turn changes the number of ways to win. That number can reach into the hundreds of thousands. The sheer range of possible outcomes on any given spin - from a handful of ways to win to well over 100,000 - is built-in variance. The reels are never set up the same way twice, which means the distance between a quiet spin and a significant one can be considerable.

The format is also structured around its bonus round, where cascading wins and climbing multipliers tend to do the most work. The gap between a quiet base game spin and a bonus round can be significant, which is part of what gives Megaways games their high-volatility character. If you want a fuller breakdown of how the mechanic works, our Megaways slots explained guide covers it in detail.

Bonanza Megaways and Extra Chilli Megaways, both available at Bally Bet, are good examples of the format in action. Bonanza is one of the games that established Megaways as a mechanic worth paying attention to – its free spins round, with unlimited multipliers, captures exactly the kind of high-volatility potential the format is known for. Extra Chilli Megaways retains that same high-volatility feel, with a bonus buy option that lets you go straight to the feature if you'd rather not wait for it to trigger.

Both are worth a look if you want to see what high-variance gameplay actually feels like in practice.

Finding your level

There's no right answer on variance. It comes down to how you want your session to feel: steady and consistent, or more stop-start with bigger swings in either direction. Neither is better than the other. It's a question of preference.

If you're not sure where you land, the best place to check a game's volatility is its paytable. Most titles include it alongside other key information like RTP and minimum and maximum stake amounts. It's a useful starting point before you commit to a spin.

For more helpful Megaways slots content, visit the Bally Bet blog. There, you'll find online casino tips and advice as well as sports betting insights from our team.

All offers mentioned correct at the time of writing but may be subject to change.