Casino Bonus Calculator

A casino bonus is advertised as free money. It almost never is. Before you claim one, there’s a single number worth knowing: what the bonus will cost you, on average, to turn into withdrawable cash. Enter the terms below and the calculator works it out — and tells you plainly when an offer is worth less than the wagering it demands.

How the Maths Actually Works

Three inputs decide everything, and the second one is where most players get caught.

1. The wagering multiplier. A “35x” requirement means you must bet 35 times a base amount before winnings become withdrawable.

2. What the multiplier applies to. This is the part buried in the terms, and it doubles or triples the real requirement:

• Bonus only — wager = bonus × multiplier. A $100 bonus at 35x means $3,500 in bets.
• Deposit + bonus — wager = (deposit + bonus) × multiplier. The same $100 bonus on a $100 deposit at 35x becomes $7,000. Identical headline, double the work.

3. The game’s RTP. Return to player is the percentage a game pays back over millions of spins. The rest — the house edge — is what your wagering costs you. A 96% RTP slot has a 4% edge, so every $100 you cycle through costs about $4 on average.

Put together, the expected cost of clearing a bonus is:

Total wager × (100% − RTP) = what it costs you on average

Compare that cost to the bonus itself. If the cost is higher, the offer is negative expected value: on average you pay for the privilege of playing with it. That doesn’t mean you’ll lose — variance means plenty of players come out ahead — it means the average outcome is a loss, and the casino has priced it that way deliberately.

Three Worked Examples

The trap: 100% up to $100, 35x on deposit + bonus

Deposit $100, receive $100. Wagering applies to $200 at 35x = $7,000 in total bets. On 96% RTP slots that costs about $280 on average — to unlock a $100 bonus. You are, on average, $180 worse off than if you’d simply deposited and played. This is the most common structure in the market, and it’s the one to walk away from.

The break-even: 100% up to $100, 25x on bonus only

Same $100 bonus, but the multiplier applies to the bonus alone: $100 × 25 = $2,500 in bets. At 96% RTP that costs about $100 — exactly the bonus value. You’re playing to a coin flip: fair, not generous. Worth taking if you were going to deposit anyway.

The good one: 50% up to $50, 20x on bonus only

A smaller headline that’s clearly better value. Deposit $100, receive $50. Wagering is $50 × 20 = $1,000. On a 97% RTP game that costs about $30 to clear a $50 bonus — positive expected value of roughly $20. Note what happened: the offer with the smallest number attached was the only one worth having.

What This Calculator Does Not Model

Being straight about the limits, because a tool that overclaims is worse than no tool. The calculation above is the core of bonus value, but four terms can make a real offer worse than the numbers suggest:

• Game weighting. Slots usually count 100% toward wagering; blackjack and roulette often count 10% or 20%, or are excluded. Clearing on a table game can multiply the real requirement fivefold or more.
• Maximum cashout caps. Some bonuses cap withdrawable winnings at a multiple of the bonus — a 5x cap means a huge win still pays out at five times the bonus and no more.
• Expiry windows. A 7-day clock on a $7,000 requirement forces bet sizes that wreck bankroll management. A generous multiplier with a tight deadline is not generous.
• Maximum bet limits. Breaching a per-spin cap while wagering usually voids the bonus and the winnings with it.

Read those four in the terms before you use any number this calculator gives you. For the full anatomy of a bonus, see our wagering requirements guide and the real cost of a casino bonus.

How to Use This Before You Deposit

• Find the multiplier and what it applies to. If the terms don’t say, assume deposit + bonus and treat that as a warning about the operator.
• Use the RTP of the game you’ll actually clear on, not the best RTP on the site.
• Run the offer you’re being sold, then run a smaller offer from the same casino. Smaller bonuses frequently win.
• If the expected cost exceeds the bonus, the honest answer is usually to decline the bonus and deposit without it.

That last option is the one casinos never mention: you can almost always deposit and play with no bonus attached, with no wagering, no caps and no expiry. For a lot of players that’s the better deal, and running the numbers is how you find out.

Frequently Asked Questions

How do you calculate a casino bonus wagering requirement?

Multiply the wagering multiplier by the base it applies to. If it applies to the bonus only, the requirement is bonus x multiplier. If it applies to deposit plus bonus, it is (deposit + bonus) x multiplier – which on a matched deposit is double the work for the same headline number. Always check the terms for which base applies.

What does a casino bonus actually cost to clear?

Total wager multiplied by the house edge, where the house edge is 100% minus the game RTP. A $7,000 wagering requirement on 96% RTP slots costs roughly $280 on average. If that figure is larger than the bonus itself, the offer is negative expected value: on average you pay to use it.

Is a bigger casino bonus always better?

No, and usually the opposite. A 100% match at 35x on deposit plus bonus can cost more to clear than the bonus is worth, while a 50% match at 20x on the bonus alone can be positive value. The multiplier and the base it applies to matter far more than the headline percentage.

What does this calculator not account for?

Four terms that can make a real offer worse than the maths suggests: game weighting (table games often count 10-20% toward wagering), maximum cashout caps, expiry windows, and maximum bet limits that void the bonus if breached. Read those in the terms before relying on any estimate.

Should I ever decline a casino bonus?

Yes. If the expected cost to clear exceeds the bonus value, you are usually better off depositing without it – no wagering, no caps, no expiry. Casinos rarely mention that playing bonus-free is an option.

18+ (21+ in some jurisdictions) · Play responsibly. This calculator gives statistical estimates, not predictions — real outcomes vary widely. Problem gambling? In the US call 1-800-MY-RESET or the National Council on Problem Gambling at 1-800-522-4700; in Canada, ConnexOntario at 1-866-531-2600.

Setting a limit before you play is the single most effective habit there is. Our guide to gambling limits that actually stick covers the tools that work and where to get free confidential help.