AskBigBonus Tools
Casino Bonus Value Calculator
Casino bonus value calculator: enter the deposit, match %, cap, wagering, game RTP and max bet to see total wagering, expected loss and the bonus's real EV.
Bonus amount
200.00
Total wagering required
6000.00
Expected loss
240.00
Real bonus value (EV)
-40.00
Suggested bankroll
375.00
Risk level
High
From a headline offer to a real number
A casino welcome offer is usually advertised as a match percentage up to a cap — "100% up to €200," for instance. That headline doesn’t tell you what the bonus is actually worth to play with once wagering requirements are factored in. This tool starts from the raw offer (your deposit, the match percentage, and the cap) to work out the real bonus amount you’d receive, then runs the same wagering-and-RTP math as our Bonus Wagering Calculator to estimate what that bonus is likely to cost, on average, to clear.
The reason this two-step process matters is that the match percentage and the cap interact in ways that aren’t obvious from the headline alone. Depositing €300 against a "100% up to €200" offer gets you a €200 bonus (capped), not €300 — your effective match rate on that deposit is only 66.7%, not 100%. Depositing exactly €200 gets the full advertised 100% match. Depositing €100 gets a €100 bonus, well under the cap, at the full 100% rate. The same offer is worth a meaningfully different percentage of your money depending on how much you actually deposit relative to the cap.
Reading the Low / Medium / High risk label
Once the calculator has your effective bonus amount, it estimates expected loss the same way the wagering calculator does — wagering requirement × house edge — and expresses that loss as a percentage of the bonus itself. Under 20% is labeled Low, 20-50% Medium, and over 50% High. This is deliberately a simple, comparable heuristic rather than a precise risk score: its job is to let you glance across several offers and immediately see which ones are worth a closer read of the full terms, not to replace reading those terms.
Comparing two real offers side by side
Consider two casino welcome offers on a €100 deposit. Offer A: 100% match (so a €100 bonus), 25x wagering on bonus only, eligible on a 96% RTP slot. Offer B: 200% match (so a €200 bonus, assuming the cap allows it), 45x wagering on bonus only, same 96% RTP slot. Offer A’s required wagering is €2,500 (€100 × 25), with an expected loss of €100 (€2,500 × 4%) — a Low risk label at roughly 100% of the bonus, right at the edge. Offer B’s required wagering is €9,000 (€200 × 45), with an expected loss of €360 (€9,000 × 4%) — a High risk label at 180% of the bonus. Despite Offer B advertising double the match percentage, its much higher wagering multiplier makes it the meaningfully worse offer once the real math is run, which is exactly the kind of comparison a headline percentage alone can’t show you.
What this tool doesn’t know
Like our other bonus tools, this calculator works from the numbers you enter — it has no way to know an operator’s specific game-weighting rules, maximum bet limits during the bonus, time limits to clear the wagering, or maximum withdrawal caps on bonus winnings, all of which can materially change a bonus’s real value beyond what the match percentage, wagering multiplier, and RTP alone capture. Treat its output as a starting comparison point between offers, and always confirm the details that matter against the operator’s full, published bonus terms before deciding.
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FAQs
What's the difference between this and the Bonus Wagering Calculator?
This tool works from the bonus offer itself (deposit, match percentage, cap) to first figure out the actual bonus amount, then applies the same wagering/RTP math. Use the wagering calculator if you already know the exact bonus amount.
How is "risk level" decided?
It compares expected loss to the bonus amount: under 20% of the bonus is labeled Low, 20-50% Medium, and over 50% High. It's a simple heuristic to help compare offers at a glance, not a precise risk measurement.
Can a bonus have positive expected value?
Yes — offers with a low wagering multiplier, high RTP eligible games, and no unusual restrictions can be +EV overall. That said, expected value is an average over many repetitions; any single session still has real variance in both directions.
Why does the deposit cap matter if the match percentage looks generous?
A "200% match" offer sounds larger than a "100% match," but if the 200% offer caps at €50 while the 100% offer caps at €200, the smaller-percentage offer produces a bigger actual bonus for anyone depositing more than €50. The match percentage alone, without the cap, doesn't tell you the real bonus amount for your deposit size.
Should I always take the bonus with the lowest expected loss?
Usually, but not automatically — a bonus with slightly higher expected loss but a much larger bonus amount and shorter time limit might still suit your bankroll and playing style better than a "cheaper" offer with a tiny bonus. Expected loss is the key comparison metric, not the only one worth weighing.