UK 10x wagering cap calculator: what is that bonus worth?

What is a wagering requirement?

A wagering requirement, sometimes called playthrough, is the amount you have to bet before bonus money turns into cash you can withdraw. It's written as a multiple. A £20 bonus with 10x wagering means £200 of bets before the bonus and anything you've won from it becomes yours to take out.

The number on its own tells you less than it seems, though. What matters is how much of the house edge you pay while you work through it, and that depends on three things the headline figure never mentions: whether the multiple applies to the bonus alone or to your deposit as well, which games count towards it, and how much of each bet those games count.

What is the UK 10x wagering cap?

It's a rule that UK-licensed casinos can't make you wager a bonus more than ten times. The change is mostly in your favour. Following rules announced by the Gambling Commission, UK-licensed operators have not been allowed to set wagering above 10x since 19 January 2026. Before that, 35x was common and 50x wasn't rare, so a £10 bonus could mean £500 of play before you saw a penny of it.

The same rules also banned mixed-product offers. A casino can no longer tell you to place a sports bet to get a slots bonus, or play bingo to get free bets. Each offer now has to stay within one product, which makes the terms far easier to follow.

There's a catch. The cap limits how many times you replay the bonus, but it doesn't stop operators shrinking the bonus itself, excluding games or capping winnings. So the 10x cap made bad offers less bad, rather than making every offer good. And if you see a site aimed at UK players still advertising 35x or 40x in 2026, that tells you something important: it almost certainly isn't licensed here, and none of the UK protections apply.

How do you work out what a casino bonus is worth?

The maths is simpler than most bonus pages make it look. Multiply the amount you have to stake by the house edge of the game you'll play. That's roughly what clearing the bonus will cost you. Take that away from the bonus, and what's left is the offer's average value.

A worked example makes it concrete. Deposit £50, get a £50 bonus with 10x wagering on the bonus only, and play a 96% RTP slot. You need to stake £500. The slot's 4% edge takes about £20 of that over time, so the bonus is worth roughly £30 on average. Now run the same £50 bonus under an old-style 35x on deposit plus bonus: £3,500 of stakes, about £140 of expected cost, and an offer that loses you around £90 on average. Same headline bonus, completely different deal. And if your own results on a 96% slot never seem to match that figure, that gap is normal over a short session.

Two caveats. First, these are averages, and slots swing a lot, so plenty of players bust before finishing and plenty finish well ahead. Second, the calculator assumes the bonus becomes withdrawable once the wagering is done. If the terms cap your winnings at, say, £100, the real value can be lower than the figure above.

How often do players finish a 10x bonus with cash left?

In our simulation, only about one attempt in six (17.1%) finished the wagering with money left. Averages hide how a bonus feels to clear, which is why we ran it. A £20 bonus at the 10x cap means £200 of wagering. We played that through 100,000 times at £1 a spin on a medium-volatility slot with an exact 96% RTP, stopping whenever the balance couldn't cover the next spin.

Only 17.1% of attempts finished the wagering with money left. The other 82.9% ran out first. Those who did finish ended with an average of £97, propped up by the occasional big hit. Across every attempt, the average cash at the end was £16.66 and the median was zero.

That average is higher than the simple formula's £12 (a £20 bonus minus £8 of expected cost), and the reason is worth knowing: players who bust stop wagering early, so they never pay the full cost. The upshot for you is that a 10x bonus is worth having, but on a slot you should expect most attempts to end with nothing, and the value to arrive as an occasional decent win. The code is on our research page.

Why do game weightings matter for wagering?

Most casinos don't count every game equally. Slots usually count 100%, meaning a £1 spin knocks £1 off your requirement. Table games often count 10% or 20%, and some are excluded entirely. At 10% weighting, a £1 blackjack hand clears just 10p of wagering.

So why would anyone clear a bonus on blackjack? Because blackjack's edge with basic strategy is around 0.5%, so even at 10% weighting the cost can be close to a 96% slot. Try it in the calculator: £500 of wagering at 10% means £5,000 of hands, and 0.5% of £5,000 is £25. The catch is that many offers exclude table games completely, so check the terms before you rely on it. If you do play blackjack, the strategy chart is what keeps the edge that low.

Free spins and no-wagering offers

Free spins work the same way underneath. The spins themselves cost nothing, but winnings from them usually arrive as bonus money with its own wagering attached, and under UK rules that multiple can't exceed 10x either. The value of a free spins offer is roughly the number of spins, times the spin value, times the game's RTP, minus whatever clearing the winnings costs.

No-wagering offers are the cleanest deal on paper, because winnings are paid as cash. They tend to be smaller for exactly that reason. A £10 no-wagering bonus can be worth more than a £50 bonus with heavy restrictions, and the calculator will tell you which.

Where AI decides which bonus you see

More than most players realise. Many operators use personalisation models to decide which offer each player sees, so two people on the same site can be shown different bonuses on the same day. A reactivation offer landing in your inbox soon after you stop playing is usually a retention model at work, not luck. The casino software page covers who builds these systems.

The other side is bonus abuse detection. Fraud models watch for patterns like several accounts claiming the same offer, or betting both sides of a market to clear wagering with no risk. Honest players rarely trigger them, but it's worth knowing they exist, and the fraud detection page explains what they look for.

Four terms to check before opting in

A handful of terms decide whether an offer is worth taking, and they're usually in the small print rather than the banner.

• Maximum bet while the bonus is active. Often £5 or less. Going over it can void your winnings.
• Expiry. Seven days to clear £500 of wagering is very different from thirty.
• Maximum win or conversion cap. This caps the upside, which lowers the real value.
• Excluded games and payment methods. Some e-wallet deposits don't qualify at all.

Put the numbers into the calculator above and see whether the offer earns a place in your budget.

Before you opt in

Work out the cost before you opt in, not after.

• Run any offer through the calculator above, using the RTP shown in the game's info screen.
• Check the licence on the UK Gambling Commission register if the wagering is above 10x.
• See how long your balance is likely to last while clearing it with the bankroll calculator.