A 100% match bonus up to $500 sounds amazing. But here's what the marketing doesn't tell you: the true value of a bonus isn't the bonus amount—it's what's left after you meet the wagering requirements.
Every bonus has a formula that determines its actual value:
True Value = Bonus Amount - Expected Loss During Wagering
Expected Loss = Total Wagering × House EdgeLet's break down each component.
Wagering requirements (also called "playthrough" or "rollover") determine how much you must bet before withdrawing bonus funds. Common formats:
Scenario A: 30x bonus only
Required wagering: $100 × 30 = $3,000
Scenario B: 30x (bonus + deposit)
You deposit $100, get $100 bonus = $200 total
Required wagering: $200 × 30 = $6,000
That's twice the wagering for the same bonus!
Not all bets count equally toward wagering requirements. Casinos use "game weighting" to reduce the contribution of low-house-edge games.
| Game Type | Typical Weighting | Effective Wagering |
|---|---|---|
| Slots | 100% | $1 bet = $1 toward requirements |
| Blackjack | 5-10% | $1 bet = $0.05-$0.10 toward requirements |
| Roulette | 10-20% | $1 bet = $0.10-$0.20 toward requirements |
| Video Poker | 0-10% | $1 bet = $0-$0.10 toward requirements |
| Live Dealer | 0-20% | $1 bet = $0-$0.20 toward requirements |
The house edge varies by game. Here's how to calculate expected loss:
Expected Loss = Total Wagering × House Edge
For a $100 bonus with 30x wagering on slots (4% house edge):
Total Wagering = $100 × 30 = $3,000
Expected Loss = $3,000 × 0.04 = $120
True Bonus Value = $100 - $120 = -$20Yes, you read that right. With a 30x requirement on a 4% house edge slot, you expect to lose $120 meeting the requirements—more than the $100 bonus is worth.
A bonus is "positive expected value" (+EV) when:
Bonus Amount > Expected Loss During WageringFactors that improve bonus value:
Most bonuses have a maximum bet limit (typically $5-$10) while the bonus is active. Violate this rule and the casino can void your bonus and winnings.
You keep the bonus amount after meeting wagering requirements. A $100 cashable bonus that leaves you with $150 balance means you withdraw $150.
The bonus amount is removed upon withdrawal. A $100 sticky bonus that leaves you with $150 balance means you withdraw only $50.
Sticky Bonus True Value = (Your Final Balance - Bonus Amount)
If you lose the bonus entirely, value = $0
If you double it, value = Bonus Amount
If you triple it, value = 2 × Bonus AmountSticky bonuses require aggressive play to extract value. Conservative play guarantees zero value.
Free spins bonuses work differently:
Those "50 free spins worth $50" might actually be worth under $2.
Casino bonuses aren't free money—they're structured offers designed to get you betting. The math determines whether you're getting a good deal or just getting played.
Before claiming any bonus, run the numbers. If expected loss exceeds bonus value, you're better off playing without a bonus and keeping full control of your bankroll.