Volatility describes how a slot's wins are spread out: low-volatility games pay small amounts often, while high-volatility games pay less often but can pay much more when they do. Two slots with the same RTP can feel completely different because of it. Volatility shapes the ride; it doesn't change the long-run cost of playing.
Volatility measures how widely results swing around the average.
Low volatility means steadier, smaller wins; high means longer dry spells and bigger peaks.
Labels like low, medium and high are set by game studios and aren't standardised.
RTP sets the average cost; volatility sets how bumpy the session feels.
On high-volatility games, a small budget can run out before a feature lands.
Also called
Variance
Measures
How results spread around the average
Labels set by
Game studios, not a regulator
Low-volatility example
Starburst (NetEnt)
High-volatility example
Dead or Alive (NetEnt)
What volatility means in a casino game
Every slot has an average return, its RTP. Volatility, often called variance, describes how far real results tend to stray from that average. A low-volatility game sticks close to it, paying back regularly in small amounts. A high-volatility game strays a long way, with many spins returning little and occasional wins that are far larger than usual.
Statisticians measure this with variance and its square root, the standard deviation. Casino maths textbooks define a slot's volatility index from the standard deviation, typically at a 90% confidence level. You won't see those numbers in an app, but the idea behind the simple labels is the same. More maths terms, including house edge, are in our casino app glossary.
Low, medium and high volatility compared
There's no regulator-defined scale, so a studio's high volatility may not match another's. The examples below show the published labels for some well-known NetEnt and Play'n GO slots alongside their RTP and maximum win.
Published volatility, RTP and maximum win for four slots
Slot
Volatility
RTP
Max win
Starburst
Low
96.09%
500x
Gonzo's Quest
Medium
95.97%
2,500x
Book of Dead
High
96.21%
5,000x
Dead or Alive
High
96.82% (highest version)
Check the paytable
Notice the RTPs are all close to 96%, yet the top prizes range from 500 times the stake to 5,000 times. That's volatility at work: to fund a much bigger top prize at a similar RTP, a game has to pay smaller wins less often. Wizard of Odds' slots overview (opens in a new tab) makes the same point, putting Dead or Alive's popularity down to its high volatility and top prize rather than its RTP. Read our reviews of Starburst and Book of Dead to see how each plays.
How volatility affects a £20 budget
Your stake decides how many spins a budget buys, and volatility decides how those spins are likely to feel.
A £20 budget at three stakes
Stake per spin
Spins before any winnings
Expected cost of one pass at 96% RTP
Fit
10p
200
80p
More spins, more chances to see a high-volatility feature
50p
40
80p
A middle ground for medium volatility
£1
20
80p
Very short on a high-volatility slot
The expected cost of staking £20 once is the same 80p at every stake (£20 × 4%). What changes is the spread. Twenty £1 spins on a high-volatility game can easily return very little, because the big wins that carry its RTP are rare. Two hundred 10p spins on a low-volatility game will usually wander gently around the average. Neither choice changes the house edge, and losses are likely over time.
Remember the UK caps: £5 a spin on online slots for players aged 25 and over and £2 for those aged 18 to 24. Our slot stake limits page has the detail.
Why volatility matters more in short sessions
The expected loss grows in direct proportion to the number of bets, but the typical swing around it grows only with the square root. So in short sessions the swing dominates, and in very long ones the average takes over.
The textbook Casino Math (opens in a new tab) shows this with American double-zero roulette, in dollars: over 1,000 bets of $5 on red, the casino's expected win is $263.16, but the standard deviation is $157.89, so about two-thirds of the time the result falls between $105.26 and $421.05. A high-volatility slot swings far more than an even-money roulette bet.
Check the volatility label in the game's information or help screen, if the studio gives one.
Look at the maximum win: a very high multiple usually signals higher volatility.
Choose a stake that gives you enough spins for that volatility within your budget.
Set a deposit limit and a reality check before you start.
Stop at your planned budget, whatever the last few spins did.
Related terms
RNG: produces the random results whose spread volatility describes.
Multiplier: features that often push a game's volatility up.
Stake limit: the UK cap on how much each spin can cost.
Partner apps and volatility in their free spins offers
Free spins at 10p let you see how a slot's volatility feels at a low stake. PlayOJO's offer is on Big Bass Bonanza, which is listed as a high-volatility slot with a 96.71% RTP and 2,100x maximum win, so expect most sets of spins to return modest amounts. Coral and Ladbrokes use selected games; check which ones in the app. All offers are 18+, for new customers, with terms applying.
PlayOJO: 80 free spins at 10p on Big Bass Bonanza with a first deposit of at least £10; new UK customers only, not Northern Ireland. Winnings are paid in cash with no wagering; the offer can't be combined and is only available through the designated link.
Coral: 100 free spins at 10p on selected games after you deposit (some methods excluded) and bet £10 on slots; offer period 1 October 2026 to 1 February 2027. 48 hours to accept, 7 days to use, no wagering on spin winnings.
Ladbrokes: 50 free spins at 10p each day for the first 10 days, up to 500, after you deposit and spend £10 on slots. Claim by 23:59 daily and use within 7 days; no wagering. E-wallet, Paysafe and prepaid deposits don't count.
Coral and Ladbrokes are both LC International Limited (Entain) brands, so you may not be able to hold new accounts at both. See our Big Bass Bonanza review for how its features work.
Coral and Ladbrokes are both run by LC International Limited (Entain). If you already hold an account with one Entain brand, you may not be able to open another; check the terms first.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read our Coral app reviewLicence: LC International Limited, Gambling Commission account 54743. Offer checked 5 October 2026.
Time limitClaim daily for 10 days; each batch valid 7 days
Worked valueUp to 500 spins at £0.10 (up to £50 in spins)
Significant terms: 18+. New customers only, from 14/11/25 until further notice. Certain deposit methods excluded. Deposit and spend £10+ on slots for 50 free spins a day during the first 10 days after first deposit and registration (max 500, £0.10 each, selected games, claim before 23:59 each day, valid 7 days). No wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read our Ladbrokes app reviewLicence: LC International Limited, Gambling Commission account 54743. Offer checked 5 October 2026.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read our PlayOJO app reviewLicence: Skill On Net Limited, Gambling Commission account 39326. Offer checked 5 October 2026.
18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
What does high volatility mean on a slot?
It means wins come less often but can be much larger when they do. Many spins will return nothing or small amounts, and the game relies on rare big wins or features to reach its RTP. A small budget can run out before those arrive, so high volatility suits players who accept long quiet spells. It doesn't change the house edge. Our answer to what is volatility on a slot app has more examples.
Is low or high volatility better?
Neither is better; they suit different preferences and budgets. Low volatility gives steadier, smaller wins that tend to stretch a session. High volatility gives a rougher ride with bigger peaks and longer droughts. With the same RTP, the expected cost per pound staked is the same. Pick the one that matches how you want to play, and set a budget either way. Our best slot apps page shows where to find a range of games.
Where can I see a slot's volatility in an app?
Some studios show it in the game's information or help screen, sometimes as a word and sometimes as a scale or icon. Others don't publish it at all. Because labels aren't standardised, treat them as a guide. The maximum win and the paytable give extra clues: a very high top prize usually means higher volatility. Our guide on how to find a game's RTP in an app shows where the help screen usually sits.
Does volatility affect RTP?
No, they're separate. RTP is the long-run average return and volatility is how results spread around it. Starburst and Book of Dead are both published at about 96% RTP, yet one is labelled low volatility with a 500x top prize and the other high with 5,000x. Over enough spins both cost roughly the same per pound staked; in a short session they feel very different. See our RTP entry.
What stake should I use on a high-volatility slot?
A lower stake gives you more spins from the same budget, which matters more on high-volatility games because their big wins are rare. £20 buys 200 spins at 10p but only 20 at £1. That doesn't improve the odds of any single spin or change the expected cost, but it lowers the chance your budget ends in a handful of spins. UK caps are £5 per spin, or £2 if you're 18 to 24. See low stakes casino apps.
Is volatility the same as variance?
In everyday casino use, yes: both describe how much results swing. Strictly, variance is a statistical measure and the standard deviation is its square root; textbooks build a slot's volatility index from the standard deviation. Game studios simply translate that into labels like low, medium and high. Our Dead or Alive review looks at a slot famous for its high volatility.
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