Casino Bonus Calculator: How to Know If a Bonus Is Worth Claiming (2026)

Senast granskad: 2026-07-24 — Tom Holm

The flashy 500% bonus costs you an expected EUR 550. The modest 50% bonus earns you an expected EUR 23.75. This is why understanding the math matters more than reading marketing copy.

Platforms like AzurSlot and MineBit tend to offer more transparent bonus structures. Always run the numbers before you claim.

Advanced Strategy: When Negative EV Bonuses Can Still Make Sense

Mathematically negative EV doesn’t always mean you should avoid a bonus. There are specific scenarios where claiming a negative EV bonus is rational:

Variance Harvesting

If you’re playing high-volatility slots, the variance can work in your favor over short wagering periods. A -EUR 20 EV bonus with 25x wagering on a high-volatility slot gives you a meaningful probability (roughly 35-45%) of finishing wagering with a profit, even though the average outcome is negative. The key is that your upside is potentially large while your downside is capped at the deposit amount.

Bonus Stacking Across Platforms

If you play at multiple casinos and claim welcome bonuses at each, the occasional positive variance outcome can offset the negative EV of other bonuses. This approach – sometimes called „bonus whoring“ – only works if you maintain strict bankroll management and never chase losses on any single bonus.

Entertainment Value Adjustment

If you would play slots regardless of whether a bonus is active, a moderately negative EV bonus still extends your playtime. A -EUR 15 EV bonus that gives you 2 extra hours of entertainment has a cost of EUR 7.50 per hour – which is comparable to cinema tickets or other entertainment spending.

Your Pre-Claim Checklist

Before claiming any bonus, verify these seven points:

1. Wagering requirement type: Bonus-only or deposit + bonus? This changes the total wagering by 2x.
2. Game contributions: What percentage do your preferred games contribute? If you play table games and they contribute 10%, multiply the effective wagering by 10.
3. Maximum bet per round: Typically EUR 5, but check. Exceeding this voids the bonus.
4. Time limit: Can you realistically complete the wagering in the time allowed? Calculate required daily wagering volume.
5. Win cap: Is there a maximum withdrawal from bonus winnings? If so, factor this into your EV calculation.
6. Restricted games: Are any high-RTP games excluded? Check the full list, not just the headline restrictions.
7. Deposit method: Is your preferred payment method eligible for the bonus? E-wallets are often excluded.

If the bonus fails on any of these points or calculates to a negative EV that exceeds your entertainment budget, skip it. There’s no shame in playing without a bonus – in fact, without wagering requirements, you can withdraw your winnings immediately and play any game you want without restrictions.