House edge simulator: what a 96% RTP does to $200 over 200 spins
Call where $200 will finish after 200 one-dollar spins, then watch seven simulated sessions play out. You will see why a single session can end ahead while the expected end, set by the house edge, sits below the start at every RTP the slider offers.
How it works
Each spin stakes $1 on a simplified slot with two outcomes: a win or nothing. The volatility setting fixes the hit rate at 46%, 24% or 11% of spins, and a win pays RTP ÷ hit rate times the stake, so at 96% a win returns about $2.09, $4.00 or $8.73. That keeps the average return per spin equal to the RTP at every setting. The house edge is 100% minus the RTP, and expected end = $200 − 200 spins × $1 × house edge. At the default 96% RTP the edge is 4% and the expected end is $192.
The tool opens with a question: after 200 spins of $1 at 96% RTP, will $200 be up, about the same or down? Your answer unlocks a chart of seven simulated sessions. The bold line is 'this session', the faint lines are six others, and a dashed line marks the $200 start. Below the chart, three readouts show the house edge, the expected end and where the bold session finished. The RTP slider runs from 85% to 99% in half-point steps, and 'Play 200 spins' draws fresh sessions, as does a change of volatility.
A 96% RTP is often read as a promise that a session pays back $96 for every $100 staked. Great Britain's remote technical standard RTS 3 requires online games to make the RTP, house edge or probability of winning available before a customer gambles, but the Gambling Commission describes that figure as the game's designed return, a share of turnover that counts every stake, including winnings staked again. It is an average over a very large volume of play, so single lines here can finish above $200 or far below $192. Volatility, usually expressed as a standard deviation, widens or narrows the scatter without moving the average.
What it leaves out: The slot has a single win size per volatility setting, where real games mix many prize tiers, features and jackpots, and seven sessions are only a small sample of possible results. The simulator is educational, meant for adults aged 18 and over, and nothing in it can change the house edge of a real game.
Sources
Checked on 2026-11-05. Independent, not affiliated. 18+.
- UK Gambling Commission: Key terms relating to live return to player performance monitoring of games of chance (guide, last updated 28 January 2021)gamblingcommission.gov.uk
- UK Gambling Commission: Remote gambling and software technical standards, RTS 3: Rules, game descriptions and the likelihood of winning (last updated 7 May 2024)gamblingcommission.gov.uk
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