A £100 bonus with a 35x wagering target asks you to stake £3,500 before any of it becomes withdrawable. That figure assumes every game you play contributes 100% of your stake toward clearing it. Play the wrong game and the real target multiplies several times over. Game weighting sets how much of each £1 you wager counts toward the requirement, and operators assign those percentages to protect their margin. You will find the weighting table three clicks into the terms, and it changes the real target more than anything on the landing page.
Most sites put slots at 100%, and operators exclude a handful of high-volatility titles altogether. Roulette contributes 10% or 20% on most brands. Live dealer tables sit at 10%, and some casinos zero them out. Run the maths on a 10% contribution: that £3,500 target becomes £35,000 of roulette stakes. Same bonus, ten times the work.
Wagering targets come in two shapes. Some sites ask you to stake the bonus alone, so £100 at 35x means £3,500. Others stack deposit and bonus together, which turns a £100 deposit plus a £100 bonus into a £7,000 target at the same multiplier. Read the first line of the terms to find out which one applies.
Browse player reviews before you check a single weighting figure. They show whether a brand pays withdrawals on time and whether support staff explain the rules in plain words. PlayKasino is worth reading up on if the name sits on your shortlist, and the same scrutiny applies to every brand competing for your deposit.
Operators do not weight games to hide the maths. Each game drains a balance at a different rate, and the table reflects that. A slot returns somewhere between 94% and 96% over millions of spins. European roulette returns 97.3%, and a player who sticks to even-money bets can stretch a balance across a whole evening.
Low-contribution games give the operator a thinner margin per pound staked, so the wagering target rises to compensate. Each percentage point in the table ties back to how a bonus scheme fits together, and none of it is arbitrary.
Volatility matters as much as return. A high-variance slot can eat a £200 balance in twenty minutes without landing a single feature. The weighting says nothing about that risk, which is why two games with identical contribution figures can produce very different outcomes.
The table lists each game category against a percentage. Find the games you play, not the ones the banner advertises. A 100% contribution on a slot you never touch is worth nothing. A 20% contribution on the blackjack table you play every week is the number that governs your bonus.
Bonus structure changes the calculation too. A matched deposit, a batch of free spins and a cashback deal each carry different weighting and different wagering. Comparing a match against free spins stops you judging both offers by the same standard.
Free spins carry their own quirks. A 10p spin rarely qualifies at the slot's full 100%, and winnings from spins land in a bonus balance with a fresh wagering target attached. Ten spins worth £1 each can arrive as a £10 bonus you must clear at 40x, which means £400 of staking to release £10.
Watch for the phrase "all games contribute" in the headline and a category table in the terms. The headline sells the 100%. The table sets out what happens when you open anything other than a slot.
Weighting is one clause in a stack of them. Most UK operators cap bets at £5 while a bonus is active, and some cap at 10% of the bonus value. Break the cap once and the operator can void the bonus along with any winnings it produced.
Expiry dates catch people out. Thirty days looks generous until you factor in a target that needs daily play to clear. Check whether the site counts the expiry from the day you opt in or the day you claim, because the difference can cost you a week.
Many bonuses cap the winnings you can keep. A 35x target on a £100 bonus with a £250 maximum withdrawal means anything above £250 returns to the operator. That cap shifts the expected value further than the multiplier does, and you will find it in the terms rather than on the banner.
The small print takes ten minutes to read and saves the rest of your balance. Look for the maximum bet clause, the expiry window, the list of excluded games and any cap on winnings from the bonus. No operator will reverse a decision once the terms back them up.
Checking the terms first beats arguing with support afterwards. Screenshot the terms page on the day you claim, because operators change clauses and the version you agreed to is the one that counts.
Exclusion lists move. Operators add and remove titles, and a game that contributed 100% last month can drop to 20% this month. Check the list on the day you opt in, and check the date stamp on the terms page if the site publishes one.
Estimate the expected loss before you claim. Take the wagering target, multiply by the house edge of the game you will play, and compare the result to the bonus value. A £100 bonus on slots at 35x means £3,500 staked. At 96% return, the expected loss is £140. You risk £140 in expectation to receive £100, a net loss of £40 before a single spin of variance.
The maths improves with lower wagering and higher-contribution games. Drop to 20x on the same slot and the expected loss falls to £80, which puts you £20 ahead in expectation. Play roulette at 10% contribution on 35x and the expected loss on £35,000 of stakes at a 2.7% edge runs past £900. Matching a bonus to your habits matters more than chasing the biggest headline number.
The offers that leave you ahead carry a modest match and low wagering on games you already play. A huge headline figure tied to 65x on excluded titles pays the operator, not you.
Variance decides whether you finish the wagering at all. A target that costs £140 in expectation can cost £400 across a bad run on a high-volatility slot, and your balance may not last long enough to clear it. Stakes small enough to absorb a dry spell matter more than the headline bonus value.
Every legitimate UK site holds a Gambling Commission licence, and the conditions cover how operators advertise bonuses and how quickly they must process withdrawals. Knowing how UKGC licensing protects players gives you leverage when a site drags its feet on a payout or applies a rule it never published.
Set deposit limits through the site, and use GamStop if your play has caused problems before. GamCare runs a helpline and live chat for anyone who wants a second opinion on how a bonus is shaping their spending.
Set a budget before you claim, not after. A bonus extends play time, and extended play costs money when the weighting pushes you onto games you would never choose. Weigh whether the bonus earns its keep against the deposit you would make without it, then decide.
A weighting table answers one question: how much of your own money the bonus asks you to risk. Read that number, run the arithmetic, and treat every other figure on the landing page as marketing until it survives the calculation.