Tools
Casino Bonus Calculator
Enter any bonus details to instantly calculate its real expected value, break-even probability, and effective return on your deposit.
Enter the bonus cash, not the match %. e.g. 100% match on £100 deposit = £100 bonus.
Most casinos apply wagering to the bonus amount only. Check your T&Cs.
Results
This calculator gives a statistical expectation. Actual results vary due to variance. House edge figures are illustrative - check the specific game's published RTP.
How to Use This Calculator
Deposit: The amount you plan to deposit to trigger the bonus.
Bonus Amount: The actual cash bonus credited. A "100% up to £100" bonus on a £100 deposit gives you £100 in bonus funds.
Wagering Requirement: How many times you must bet the bonus before it becomes withdrawable. A 35x requirement on a £100 bonus means you must wager £3,500 total.
House Edge: The casino's statistical advantage on each bet. Slots average 4-6%. Blackjack played with basic strategy is under 0.5%.
What the Numbers Mean
Expected Value: Your average outcome after clearing the bonus. Negative means you statistically lose money even with the bonus. Positive means the bonus tilts the maths in your favour.
Chance of Profiting: Due to variance, individual sessions vary widely. Even a -EV bonus can result in profit for individual players - this is the estimated proportion who will come out ahead.
Effective Bonus %: How much of the headline bonus you statistically keep. A £100 bonus with -£40 EV has an effective value of £60, or 60% effective.
