Wagering Requirements Explained: The Maths Behind Casino Bonuses

Wagering requirements are the reason a “€200 bonus” is not €200. They are the mechanism that lets casinos advertise generous numbers while protecting themselves mathematically — perfectly legal, clearly disclosed, and widely misunderstood. Once you can do the maths behind them, you will never look at a bonus banner the same way again.

The basic definition

A wagering (or playthrough) requirement states how much you must bet in total before bonus funds — or winnings derived from them — can be withdrawn. It is expressed as a multiplier: 35x means you must place bets totalling 35 times the relevant amount.

The first trap hides in the words “relevant amount.” There are two common formulas:

• Bonus only: 35x on a €100 bonus = €3,500 in required bets.
• Deposit + bonus: 35x on a €100 deposit plus €100 bonus = €7,000 in required bets — double, for the same headline offer.

Two casinos advertising “100% up to €100, 35x wagering” can therefore demand wildly different things. Always check what the multiplier applies to.

Game weighting: not all bets count equally

Casinos weight games differently toward wagering. Slots typically contribute 100% of each bet; table games like blackjack and roulette often contribute only 10–20% or are excluded entirely; some high-RTP slots are also excluded. A €10 blackjack hand at 10% weighting clears just €1 of your requirement. If you are a table-game player, most slot-oriented bonuses are close to worthless for you — the terms list will tell you.

The expected cost of clearing a bonus

Here is the calculation the industry hopes you never do. Every euro you wager passes through the house edge. The statistically expected loss of clearing a requirement is roughly:

Total required turnover × house edge of the game you play

Take a €100 bonus at 35x on the bonus only, cleared on a 96% RTP slot (4% house edge): €3,500 × 4% = €140 expected loss — more than the bonus itself. On a deposit-plus-bonus formula, the expected loss doubles to €280. Variance means your personal result will scatter widely around these figures, but the averages explain a familiar experience: bonuses feel like they “always disappear right before the end.” Mathematically, many are designed so that, on average, they do.

This does not make every bonus bad. Lower multipliers (20x and under on bonus only), high-RTP eligible games, and no maximum-cashout clauses can tip an offer into genuinely decent value — especially if you were going to play anyway.

Sticky vs non-sticky bonuses

A further distinction worth knowing: with a non-sticky (parachute) bonus, your real-money deposit is used first, and you can withdraw it at any point before the bonus funds activate. With a sticky bonus, deposit and bonus merge immediately and everything is locked until wagering completes. Non-sticky terms are significantly more player-friendly and are a hallmark of casinos competing on fairness rather than headline size.

How to read any bonus in one minute

• Multiplier — and does it apply to bonus only, or deposit + bonus?
• Game weighting and excluded titles
• Maximum bet while wagering (breaching it voids everything)
• Maximum cashout, if any
• Time limit to complete wagering
• Sticky or non-sticky structure

And remember the quietly radical option printed in every terms document: you can decline the bonus. Playing with clean money, withdrawable at any moment, is itself a strategy — often the best one on the table.