Wagering calculator
How much you have to bet before a bonus becomes money you can withdraw, and what that betting costs you on average.
How the calculator works
Four lines of maths decide what a bonus is worth to you:
- Amount to bet = the bonus (or deposit + bonus, if the terms say so) × the wagering requirement ÷ the game’s contribution.
- Number of bets = amount to bet ÷ your usual bet.
- Average cost of that betting = amount to bet × house edge. It’s what the house keeps on average over that many bets; a single session can end far above or below it.
- Bonus value on average = bonus − average cost. Below zero, the wagering costs more than the bonus gives, on average.
A worked example
A 100 bonus with 35× wagering on the bonus means 3,500 in bets. On a game with a 1% house edge (99% RTP), that betting costs 35 on average, so on average you keep 65 of the bonus. On a slot with 96% RTP, a 4% house edge, the same 3,500 costs 140 on average: 40 more than the bonus is worth.
If the 35× counts on deposit + bonus and you deposited 100, you need 7,000 in bets. That costs 70 on average at a 1% edge and 280 at 4%.
Game contribution
Casinos don’t always count every bet in full. If a game counts 20%, each 10 you bet on it clears only 2 of the wagering, so you need five times the betting, and five times the average cost. The bonus terms list which games count and by how much.
What the calculator can’t see
Read the bonus terms for the rules that change the picture:
- a maximum bet while the bonus is active;
- a time limit for finishing the wagering;
- games that don’t count at all;
- a cap on how much of the bonus winnings you can withdraw (max cashout).
It can’t see luck either. The average cost is a long-run figure: you can lose your whole balance before you finish the wagering, or finish well ahead.
Where to find the numbers
The wagering and minimum deposit for every site we list are on its code page, and side by side in our comparison table. A game’s RTP is usually shown in its info or rules panel, and the house edge is 100% minus the RTP. Our guide to the house edge explains where that number comes from, and the one on provably fair games shows how to check a game’s results yourself.
This calculator shows averages, not a promise of any result. Gambling involves risk of loss: play only where it is legal for you, and only with money you can afford to lose. 18+ only.






