Picking the Right Game to Clear a Bonus, and What It Actually Costs YouThe math behind game weighting and wagering contributions, and why volatility can work against a bonus instead of for it
Two players can clear the exact same bonus and end up with very different results, purely based on which games they played it on — not luck, math. A game’s listed house edge only tells part of the story; how much of a bet actually counts toward the wagering requirement matters just as much, and sometimes matters more. This page works through the actual arithmetic: how contribution rates multiply the wagering a player really has to do, how to turn that into a real expected-cost figure before ever placing a bet, and where volatility helps or quietly works against clearing a bonus in one piece. Last reviewed September 2026.
Jump to: Contribution math · Expected cost · Volatility trade-off · By game type · Glossary · FAQ
What a contribution percentage actually multiplies
A contribution rate (also called weighting) is the share of a bet that counts toward a wagering requirement — and it applies to the bet size, not the outcome. A $1 bet on a game with 100% contribution counts $1 toward the requirement regardless of whether it wins or loses. A $1 bet on a game with 10% contribution counts only $0.10, win or lose. That single number changes how much total wagering a player actually has to do to clear the same bonus.
Take a $25 bonus with a 40x wagering requirement: $25 × 40 = $1,000 of contribution-weighted turnover required. On a slot at 100% contribution, wagering $1,000 total clears it. On a table game at 10% contribution, each dollar wagered only counts a dime — so clearing the same $1,000 requirement takes $10,000 in actual bets, ten times the turnover, on the same bonus.
Slots sit at or near 100% contribution almost universally, along with most scratch card and instant-win titles — this is the number the wagering requirement is usually written against in the first place.
Live dealer blackjack and baccarat, standard RNG table games, roulette, and video poker are commonly reduced — but the specific number varies enormously by operator. One casino’s live dealer contribution might be 20%; another’s might be 0% for the identical game type. There is no single industry-standard figure here, which is exactly why it’s worth checking a specific bonus’s own terms rather than assuming a category-wide number.
Craps, certain table games, and progressive jackpot slots are frequently excluded from bonus play entirely rather than merely reduced. Playing an excluded game while a bonus is active typically doesn’t advance the wagering requirement at all, and some operators treat it as a bonus-terms violation with consequences beyond a wasted bet — reading the excluded-games list before playing is worth the two minutes it takes.
Reduced or zero contribution on these specific games isn’t arbitrary. Betting equal amounts on both sides of a near-50/50 proposition — red and black in roulette, pass and don’t-pass in craps — lets a player grind through a wagering requirement while risking very little net money, since the two bets largely cancel each other out. Operators restrict contribution on exactly the games where this kind of hedge betting is possible, along with skill games like blackjack and video poker where an already-low house edge leaves little room for the operator to expect a profit from the wagering itself.
The formula behind what a bonus actually costs to clear
Contribution rate and house edge only become useful together. The expected cost of clearing a bonus on a given game works out to roughly:
Expected loss ≈ (required turnover ÷ contribution rate) × house edge
That single formula is why a game’s advertised house edge can be misleading on its own. A very low house edge multiplied by a very low contribution rate can end up costing more, in expectation, than a higher house edge at full contribution. Using the $25 bonus / 40x / $1,000-requirement example from above, here’s how four common choices actually compare:
Turnover needed: $1,000 ÷ 100% = $1,000. Expected loss: $1,000 × 4% = $40.
Turnover needed: $1,000 ÷ 10% = $10,000. Expected loss: $10,000 × 0.5% = $50 — more expensive than the slot above, despite an eight-times-lower house edge, because the contribution rate more than cancels out the edge advantage.
Turnover needed: $1,000 ÷ 20% = $5,000. Expected loss: $5,000 × 1.06% ≈ $53 — the most expensive of the four in this example, combining a moderate house edge with a moderate contribution cut.
Turnover needed: $1,000 ÷ 20% = $5,000. Expected loss: $5,000 × 0.46% ≈ $23 — the cheapest option here, but only because the contribution rate in this example (20%) isn’t punishingly low. At a 10% or 5% contribution rate instead, this same low-edge game can easily become the most expensive of the four rather than the least. Video poker’s outcome depends more heavily on its specific contribution rate than almost any other category, precisely because its house edge is already so small that contribution dominates the calculation.
The takeaway isn’t “always play slots” or “always avoid blackjack” — it’s that both numbers, contribution and house edge, have to be checked together for a specific bonus at a specific operator before assuming which game is actually cheapest to clear it on.
Volatility’s real effect: bust risk, not bonus value
Two games can carry the identical house edge and identical contribution rate and still behave very differently while grinding out a wagering requirement, because of volatility — how widely individual results swing around that shared average. For a fixed house edge, higher volatility widens the range of possible outcomes across a fixed number of wagered dollars, which mechanically raises the probability of hitting zero before the required turnover is completed — a standard result from the same random-walk math behind “risk of ruin” calculations. Going bust mid-wagering doesn’t just end the session; it typically forfeits the bonus (and, on non-sticky terms, any required deposit contribution) before the requirement was ever finished.
Meanwhile, the upside that high volatility is supposed to offer is frequently capped anyway: bonus terms commonly include a maximum cashout limit, so an outsized win from a rare high-volatility hit often pays out only up to that cap regardless of how much the spin actually won. The asymmetry runs one direction — more downside risk during the clear, without a proportional increase in what a lucky outcome is even allowed to pay.
Smaller, more frequent results keep the bankroll closer to its expected path, which generally raises the odds of surviving to complete the required turnover intact — steadier is specifically useful here, not just a matter of preference.
Same expected loss on paper, but a wider spread of possible outcomes means a real chance of busting out well before the turnover is finished — and any big win that does land is often trimmed down to the bonus’s max cashout limit regardless.
Smaller flat bets relative to the total turnover required spread the same wagering across more individual bets, which reduces how much any single result can move the bankroll — this lever is arguably as important as choosing a “low volatility” game outright, and it’s one a player controls directly regardless of which game they’ve picked.
Where contribution commonly lands, category by category
These are commonly cited patterns pulled from a range of operator examples, not fixed industry figures — contribution rates for the same game category can and do vary widely from one casino to the next, so treat this as a starting expectation to verify against a specific bonus’s own terms.
Near-universal 100% contribution — the category the wagering requirement is typically calibrated against by default.
Commonly reduced, but the range is wide — some operators list these around 20%, others exclude live dealer entirely, so this is one of the least consistent categories across casinos.
Often reduced to somewhere in a roughly 0-25% range, or excluded outright — a direct consequence of blackjack’s already-low house edge under correct strategy, discussed above.
The widest spread of any category — commonly reduced anywhere from single digits up to 50%, or excluded from specific bonuses altogether. Worth checking individually every time, given how much the contribution figure alone determines this game’s effective cost, per the worked example above.
Commonly reduced, again across a wide cited range, partly tied to the hedge-betting concern covered above — European roulette (single zero) is sometimes weighted differently from American (double zero) given the underlying house edge difference.
Frequently reduced or excluded entirely — craps in particular is commonly listed at 0% contribution at operators that otherwise offer generous weighting elsewhere.
Commonly excluded from bonus play entirely, separate from the otherwise-generous contribution non-progressive slots usually receive, since a jackpot hit represents exactly the kind of outsized, hard-to-predict payout operators write bonus terms to limit exposure against.
Terms used throughout this page
Questions worth answering before picking a game
Not necessarily. As the worked example above shows, a low-edge game with a heavily reduced contribution rate can end up more expensive in expectation than a higher-edge game that contributes 100%. Both numbers need to be checked together for the specific bonus in question.
Both games can carry a house edge under 1% with correct strategy — occasionally near breakeven on specific paytables or rule sets. That leaves very little built-in margin for the operator to expect from the wagering itself, so reduced or zero contribution is a standard way of protecting against that.
This is exactly the behavior reduced contribution and outright exclusion on these games is designed to prevent. Operators are aware of hedge betting and generally weight these games specifically to make it ineffective, alongside terms that can flag the pattern directly.
Not the expected cost itself — that’s driven by house edge and contribution rate. What volatility changes is the distribution around that expected outcome: higher volatility raises the chance of busting out before the requirement is finished, without a proportional benefit since big wins are usually capped by the bonus’s max cashout anyway.
Both help, but bet size relative to the total required turnover is at least as significant a lever, and it’s one that’s fully within a player’s control regardless of which game they’ve chosen. Smaller flat bets spread the same wagering across more individual results, reducing how much any single outcome can move the bankroll.
Typically the bonus (and, under non-sticky terms, any required deposit) is forfeited, and any partial wagering progress doesn’t carry over. This is exactly the outcome the volatility and bet-sizing discussion above is aimed at avoiding.
Usually not an option at all — progressive jackpot titles are commonly excluded from bonus play entirely, separate from the otherwise-generous contribution regular slots receive, so this is worth confirming before assuming a favorite jackpot title will count.
Contribution rates, house edges, and max cashout terms vary by operator and by specific bonus — the figures on this page are illustrative examples used to show the underlying math, not universal numbers. Always check a specific bonus’s own terms before assuming how a given game will be weighted.