Casino Bonus Calculator
Enter an offer's terms to see how much play it needs, what that play is expected to cost, and what the bonus is really worth. Works for deposit matches and free spins.
Start from a common offer
Positive expected value on paper. Remember variance, the max-bet rule and the expiry can still end it early.
Expected value is an average over many attempts, not a prediction for one session. It ignores time limits and the chance of losing the balance before the requirement is met. 18+ · BeGambleAware.org.
Frequently asked questions
How does the calculator work out bonus value?
Value = bonus − (stake required ÷ game contribution) × (100% − RTP), then capped at the maximum cashout if there is one. Stake required is the wagering multiplier times the bonus (or deposit plus bonus).
What multiplier should I enter for a UK casino?
Since 19 January 2026 UK-licensed casinos cannot set more than 10x on bonus funds, so 10 or lower. Offshore sites may still use 35x–45x.
Why does the value go negative?
Because the expected cost of the play needed to clear the requirement exceeds the bonus. That happens at high multipliers, low RTP versions, or low game contribution.
Does a positive value mean I will profit?
No. It is an average over many attempts. Variance, the max-bet rule, expiry and the chance of losing the balance early all reduce the real outcome. Never gamble to chase a calculated value.
18+ only. Gambling can be addictive — please play responsibly. Significant terms apply to all offers. For free, confidential support visit BeGambleAware.org.