A “100% bonus up to £500” sounds generous until you read the wagering requirement — the fine print that decides whether you ever see a penny of it. It is the most important number in any casino offer, and the one most players skip.
This guide explains exactly what wagering requirements are, how to work out what a bonus is really worth in a couple of minutes, and the sneaky variations that turn a headline offer into a trap.
What a wagering requirement actually is
A wagering requirement is the number of times you must bet the value of a bonus before the winnings become withdrawable cash. It is written as a multiplier — “35x”, “40x”, and so on.
Take a £100 bonus with 35x wagering. 35 × £100 = £3,500. You must place £3,500 worth of bets before any bonus winnings can be cashed out. That is not £3,500 of your own money — the same stake gets recycled as you win and lose — but it is a lot of turnover, and every bet carries the house edge.
Bonus-only vs deposit + bonus
This is the detail that catches people out. Some casinos apply the multiplier to the bonus alone; others apply it to your deposit plus the bonus.
Deposit £100, get a £100 bonus at 35x. If wagering is on the bonus only, that is £3,500 of turnover. If it is on deposit + bonus, it is 35 × £200 = £7,000 — double the grind for the same headline offer. Always check which base applies before you claim.
Game contribution: not every bet counts fully
Wagering rarely counts every game at 100%. Slots usually contribute 100%, but table games such as blackjack or roulette often count 10–20%, and some games are excluded entirely.
If table games contribute 20%, you must bet five times as much on them to clear the same requirement. This is why bonus terms and the games you actually enjoy playing need to line up — a great slots bonus is near-useless to a dedicated blackjack player.
Working out the real cost
Every bet loses the house edge on average. A slot with 96% RTP (return to player) keeps about 4% of every pound staked over time. Multiply your total required turnover by that edge to estimate what clearing the bonus will cost you.
For our £100 bonus at 35x on 96% slots: £3,500 turnover × 4% ≈ £140 expected cost — more than the £100 bonus itself, meaning it has negative expected value. The same bonus at 25x costs about £100 to clear: break-even, and anything lower is genuine value. Our bonus calculator does this maths instantly for any offer.
| Wagering | Total bets required | Est. cost to clear | Verdict |
|---|---|---|---|
| 20x | £2,000 | £80 | Positive value |
| 25x | £2,500 | £100 | Break-even |
| 35x | £3,500 | £140 | Negative value |
| 45x | £4,500 | £180 | Poor value |
Other terms that change the picture
Even with fair wagering, watch for a maximum bet while wagering (often £5 — breaching it can void the bonus), a maximum cashout cap on winnings, a time limit to complete the playthrough, and any list of excluded games. Any one of these can quietly reduce a bonus’s value.
A trustworthy operator states all of this clearly and up front. On SlotVault we decode the wagering, time limit and key restrictions on every listing — and how we score operators weighs term fairness heavily.
Frequently asked questions
What does 35x wagering mean?
It means you must bet 35 times the value of the bonus before winnings can be withdrawn. On a £100 bonus that is £3,500 in total bets. Whether the multiplier applies to the bonus alone or to deposit plus bonus changes the total, so always check which.
Is lower wagering always better?
Almost always. A £50 bonus at 20x wagering is usually better value than a £200 bonus at 45x, because the smaller requirement costs far less to clear. The headline figure matters much less than the terms attached to it.
Do free spins have wagering requirements?
Usually yes — winnings from free spins are typically paid as bonus funds with their own wagering. See our guide on whether free spins are worth it.