Two numbers decide how a casino game actually behaves over time in Ontario in 2026: return to player (RTP) and volatility. Neither one predicts a single spin, and neither one is marketing language once you understand the arithmetic behind it. This guide walks through both with real calculations, so you can read a game's numbers the way the math actually works rather than the way a lobby banner presents them.
What RTP actually measures
Return to player is a theoretical percentage that describes how much of all money wagered on a game is returned to players as winnings over a very large number of spins — typically the figure is calculated across millions of simulated rounds, not the handful of sessions any one player will ever see. A game with 96% RTP is built to return $96 for every $100 wagered across its full lifetime of play, with the remaining $4 representing the house edge.
The house edge is simply the flip side of RTP: 100% minus the RTP figure. A 96% RTP game carries a 4% house edge. A 94% RTP game carries a 6% house edge — one and a half times larger, even though the two percentages look close together on a game info screen.
The math behind a session, worked through
RTP is a long-run average, not a per-spin guarantee, and the gap between those two ideas is where most confusion starts. Here is what the number actually implies over a real session.
Suppose you play a 96% RTP slot at $1 per spin for 200 spins, wagering $200 in total. Theoretical RTP alone would suggest an expected return of 96% × $200 = $192, for an expected loss of $8 across the session. In practice, your actual result on any single 200-spin session can land well above or well below that figure — you might finish the session up $150 or down $120 — because 200 spins is nowhere close to the sample size the RTP figure is calculated over. RTP becomes a more reliable predictor of outcome only as the number of spins climbs into the tens of thousands and beyond; short sessions are dominated by variance, not by the long-run average.
Volatility: the variable RTP does not describe
RTP tells you how much a game returns on average. Volatility (also called variance) tells you how that return is distributed — whether it arrives as frequent small wins or occasional large ones. Two games can share the same 96% RTP and feel completely different to play.
Low volatility
A low-volatility game pays out more often, but the individual wins are smaller relative to the stake. Your bankroll moves in small, frequent steps, and a $100 bankroll can typically sustain a long session because losing streaks tend to be shorter and shallower.
High volatility
A high-volatility game pays out less often, but individual wins can be dramatically larger — sometimes hundreds of times the stake on a single spin. The same $100 bankroll can be exhausted quickly during a dry stretch, and the game only delivers on its RTP figure over a much longer run of play than a low-volatility title needs.
Medium volatility
Medium-volatility games sit between the two, balancing win frequency and win size, and are usually the easiest category for a new player to build intuition on before trying either extreme.
Table games and the same math from a different angle
House edge applies just as directly to table games, though it is usually expressed as a fixed percentage rather than an RTP figure, and it can change based on the specific rule set or bet a player chooses. A blackjack table played with correct basic strategy typically carries one of the lowest house edges available in a casino, often under 1%, while a side bet attached to the same table can carry a house edge many times higher because it pays out on much rarer outcomes. The general rule holds across every game type: the rarer and larger the potential win, the higher the house edge usually sits, and the more volatile the swings will feel across a session.
Progressive jackpots follow a related but different logic
A progressive jackpot game usually carries a slightly lower base RTP than a comparable non-progressive title, because a portion of every wager is diverted into a growing jackpot pool rather than into the regular pay table. That diverted portion is still counted as part of the game's overall RTP figure — it is simply sitting in the jackpot rather than being paid out on individual spins, so the headline RTP can understate how a single lucky player's outcome will look while accurately describing the return across every player who ever spins that pool. Treat a progressive jackpot's base RTP and its jackpot odds as two separate pieces of information: one describes ordinary play, the other describes a rare event with its own, usually very long, odds.
How to use RTP and volatility together, practically
Neither number should be read alone. A high RTP paired with high volatility does not mean frequent wins — it means the game's long-run fairness is strong, but any single session can still swing hard in either direction before that fairness shows up in your results. A player working with a small, fixed session bankroll is usually better served by a lower-volatility game even at a slightly lower RTP, because the smoother distribution of outcomes makes the bankroll last long enough for the math to start working in a predictable way. A player with a larger bankroll and more tolerance for dry spells can reasonably choose a higher-volatility game chasing a bigger single outcome, understanding that most sessions on that game will land below the average.
A practical checklist before you pick a game
- Check the published RTP figure on the game's information screen — it is disclosed for virtually every regulated online slot.
- Convert RTP to house edge (100% minus RTP) to see the actual cost of play in plain terms.
- Read the volatility rating, usually listed as low, medium or high, alongside the RTP figure.
- Match volatility to your bankroll size and session length, not to how exciting the game looks.
- Remember that a short session tells you almost nothing about whether a game's true RTP is being reflected — only very large sample sizes do that.
- Treat side bets and bonus features on table games as their own house-edge calculation, separate from the base game.
FAQ
Does a 96% RTP mean I will get back 96 cents of every dollar I spend?
Not on any single session. It means the game is designed to return 96% of all money wagered across a very large number of spins. Individual sessions will land above or below that figure, often by a wide margin.
Is a high-volatility game always riskier than a low-volatility one?
It is riskier to your session bankroll in the short term, because wins are less frequent, even if the long-run RTP is identical or higher. A high-volatility game needs a larger bankroll and more spins to reflect its theoretical RTP than a low-volatility game does.
Where can I find a game's real RTP figure?
Most regulated online slots display RTP directly on an information or paytable screen inside the game itself. That figure describes the specific version of the game you are playing, since some titles ship multiple RTP configurations.
Does basic strategy change the house edge at blackjack?
Yes. Playing every hand according to correct basic strategy brings the house edge down close to its published minimum for that specific rule set. Deviating from basic strategy, or adding side bets, raises the effective house edge you are playing against.
Editorial note
Written by the Ontario Bonus editorial team from operator terms, regulator registers and our own country-by-country checks. Operators do not edit their reviews. Gambling is paid entertainment; play with a limit. Read more about our editorial process and our guidelines for responsible gaming.
