Slot volatility (variance) determines how your bankroll behaves during play. Low volatility slots pay small wins frequently — steady bankroll, lots of entertainment, modest upside. High volatility slots pay rarely but big when they hit — wild bankroll swings, chance of huge wins, lots of dead spins. This simulator runs 1,000 sessions of 500 spins each at different volatility levels to show you the realistic distribution of outcomes.

Set your bankroll, base bet, and slot volatility (low/medium/high or custom standard deviation), and the simulator returns a distribution chart of final bankroll positions, the probability of busting before the bonus feature, the median outcome, and the 5th/95th percentile outcomes. The simulator uses real slot math — win probability and payout sizes based on industry-typical game parameters.

Use this to decide: if you have a £100 bankroll and want to play Starburst XXXtreme (high volatility), expect to bust 70% of the time before hitting a bonus. If you want sustained playtime, choose a low volatility slot like Blood Suckers (98% RTP, low variance). For UKGC-regulated play: casinos are required to publish volatility classification — check the game info page before playing.