Gambling terms, explained straight

Slots & Gaming Machines

Slot machine volatility list

A slot machine volatility list is a classification that groups slot games by their payout variability, typically from low to high, based on how often and how much they pay.

Also called
Volatility chart, variance list, volatility rating list
Common scale
One academic source uses a 1-to-8 scale based on standard deviation of RTP over many bets4
Regulatory use
In Great Britain, volatility helps define the acceptable RTP tolerance range for live monitoring12

Key points

  • High-volatility slots pay less often but with larger prizes; low-volatility slots pay more often but smaller amounts35.
  • Volatility is measured statistically, commonly by standard deviation, not by a single spin outcome14.
  • No single universal numeric standard exists for volatility labels; ratings vary by provider or regulator14.

Where this term is used

Slots Slot machine The physical or digital game device itself, not a classification of its payout pattern. Slots Slot machine symbols list A catalogue of the icons that appear on the reels, not a measure of payout variability. Slots Slot volatility The general concept of payout variability in slots, of which a volatility list is one organised presentation. Slots Slot machine jackpot The largest possible payout on a machine, which high-volatility games may offer but a volatility list covers all payout levels. Slots Slot machine reels The spinning columns that display symbols, unrelated to the statistical classification of payouts. Slots Slot machine price The cost to purchase a machine, not a list of its payout behaviour.

Sources

  1. Key terms relating to live return to player performance monitoring of ... gamblingcommission.gov.uk Defines volatility and its regulatory use in Great Britain.
  2. What volume of play should be achieved before measuring the actual RTP? gamblingcommission.gov.uk Explains how volatility determines RTP tolerance ranges for monitoring.
  3. A Monte Carlo Analysis of Hypothetical Multi-Line Slot Machine Play tandfonline.com Describes high vs low volatility payout patterns.
  4. Volatility under the spotlight: panel regression analysis of ... tandfonline.com Provides a 1-to-8 volatility scale based on standard deviation.
  5. Best Payout Slots by Software ᐈ #1 Guide for High RTP ... wizardofodds.com Confirms the low/high volatility payout frequency distinction.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.