Contribution percentage meaning: it is the share of each bet that counts towards a bonus's wagering requirement. At 100%, a £1 spin adds £1 to your progress; at 10%, a £1 roulette bet adds just 10p. The percentage varies by game type and is set in the offer's terms, so it can turn a modest 10x target into a long one.
Contribution percentage, also called game weighting, sets how much of each stake counts towards wagering.
Slots usually count at 100%; table and live games often count at a lower rate or 0%.
Divide the wagering target by the percentage to find the real stakes needed.
The house edge applies to the full stake, whatever percentage counts.
Some UK offers, such as 10bet's, simply say wagering must be done on slots.
Also called
Game weighting, wagering contribution
Typical slots rate
100%
Formula
Stakes needed = wagering ÷ contribution %
Example
£200 wagering at 20% = £1,000 of bets
Where to find it
Bonus terms or a game weighting table
Contribution percentage meaning, simply put
Every bonus with wagering requirements needs a rule for which bets count. The contribution percentage is that rule. A game listed at 100% counts in full, one at 50% counts half, and one at 0% doesn't count at all. You still stake the full amount and the casino still settles it in full; only the figure added to your wagering counter changes.
You will also see it called game weighting or stake contribution. It is separate from the list of selected games on free spins, which decides where spins can be used rather than how bets count.
Why casinos weight games differently
Games have different house edges and different swings. Low-edge games such as some blackjack variants cost the player less per £1 staked, so a casino that counted them in full would see its bonus cleared at less cost. Weighting evens that out from the casino's side. Some games are excluded because their structure makes it possible to cover several outcomes at once, which the casino treats as reducing its risk.
The reason doesn't change the result for you: lower percentages mean more betting, more time and more exposure to the house edge before a bonus converts. Our page on why some games are excluded from bonuses goes further.
Typical contribution percentages by game type
There is no standard table; every operator sets its own. The figures below are illustrative of how weighting tables are often laid out, not the rates of any particular casino. Always use the table in the terms of the bonus you are looking at.
Illustrative weighting table and its effect on £200 of wagering
Take a £20 bonus with 10x wagering: £200 of qualifying play. On a slot counting at 100% with 96% RTP, you stake £200 and the average cost is around £8 (4% of £200).
Now try to meet it on a game that counts at 10%. You would need £2,000 of stakes. Even with a lower house edge of, say, 1%, the average cost of £2,000 of play is about £20, which wipes out the whole bonus on average. The lower contribution doesn't make wagering cheaper; it usually makes it dearer and longer. Results in any session vary, and the bonus never changes the game's odds.
Betting on a game that counts at 0% while a bonus is active can, under some terms, be treated as a breach. Check before you play anything other than the listed games.
Where contribution percentage appears in bonus terms
Look for a heading such as "game contribution", "wagering contribution" or "game weighting", often as a table near the end of the bonus terms. Shorter offers just name the qualifying games: 10bet's welcome bonus says the bonus must be wagered 10x on slots within 3 days, and Casumo's offer states that game, play and payment restrictions apply. Both are 18+ and new customers only.
Contribution percentage and the UK 10x wagering cap
Since 19 January 2026, UK-licensed casinos can't ask for more than 10 times the bonus in wagering, as the Commission set out when it announced the promotions changes (opens in a new tab). The cap applies to the multiplier, not to the stakes you place on a low-weighted game. A 10x target on a game counting at 20% still means 50 times the bonus in actual bets, so weighting is worth reading even under the cap. Our page on the 10x wagering cap explains the rule itself.
Contribution only matters when there is wagering. The three partner spin offers below don't have any, so weighting isn't a factor; 18+ and terms apply. Coral gives 100 spins at 10p on its listed games after a deposit and £10 of slots bets, valid 7 days, with no wagering on winnings; some e-wallets, prepaid and debit cards are excluded.
Ladbrokes gives up to 500 spins at 10p, 50 a day for 10 days, after you deposit and spend £10 on slots, also without wagering. PlayOJO gives 80 spins on Big Bass Bonanza at 10p on a first deposit of £10 or more, with cash winnings; Northern Ireland is excluded.
Coral and Ladbrokes are both run by LC International Limited (Entain). If you already hold an account with one Entain brand, you may not be able to open a new account with another; check the terms before signing up.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read the Coral reviewLicence: LC International Limited, UKGC account 54743. Offer checked 5 October 2026.
Significant terms: 18+. New customers only, from 14/11/25 until further notice. Certain deposit methods excluded. Deposit and spend £10+ on slots for 50 free spins a day during the first 10 days after first deposit and registration (max 500, £0.10 each, selected games, claim before 23:59 each day, valid 7 days). No wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read the Ladbrokes reviewLicence: LC International Limited, UKGC account 54743. Offer checked 5 October 2026.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read the PlayOJO reviewLicence: Skill On Net Limited, UKGC account 39326. Offer checked 5 October 2026.
18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: set a budget. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
What does contribution percentage mean in a casino bonus?
It means the share of each bet that counts towards the bonus's wagering requirement. A game at 100% adds the full stake; a game at 25% adds a quarter of it. If you need £300 of wagering and play a game counting at 25%, you must stake £1,200. The percentages are set by each casino in the bonus terms, often as a table by game type. Our guide to game weighting explains how to read those tables.
Do slots always count 100% towards wagering?
Usually, but not always. Most UK offers count slots in full, yet some exclude certain slots, such as jackpot games or those from particular studios, or count them at a lower rate. The bonus terms list any exceptions. A few offers name only a handful of slots that count. Check before you play, because a bet on an excluded game might not count or could breach the terms. See which games are excluded from bonuses for common examples.
Why does roulette count less towards wagering?
Roulette usually counts less because its house edge is lower than most slots and because some ways of betting cover large parts of the table at once. Casinos weight it down so a bonus costs them a similar amount whichever game is played. For you, a lower percentage means more total stakes to finish the same target. Can I use a bonus on roulette explains the usual restrictions, and the table games guide covers blackjack and baccarat too.
How do I calculate wagering with contribution percentage?
Divide the wagering target by the contribution percentage written as a decimal. A £150 target at 100% needs £150 of bets; at 50% it needs £300; at 10% it needs £1,500. Then multiply the stakes by the game's house edge to estimate the average cost. For £300 of bets at a 4% edge, that is about £12. Our guide on how to calculate wagering requirements and the wagering calculator do this for you.
Does contribution percentage apply to free spins?
Only if the spins' winnings carry wagering. No-wagering spins pay cash, so contribution doesn't apply at all. If spins pay out as bonus funds with, say, 10x wagering, the weighting table then decides how much each later bet counts. The spins themselves are played on the selected games named in the offer. The Coral, Ladbrokes and PlayOJO welcome spins are no-wagering under their current terms. Read do free spins count towards wagering for more.
Is a 0% contribution game banned during a bonus?
Not always, but it is worth checking. A game at 0% simply doesn't move your wagering counter. Some terms go further and say that playing excluded games with bonus funds, or with an active bonus, can lead to winnings being removed. The wording varies between casinos. If you want to play a game that doesn't count, you may prefer to finish or cancel the bonus first. What happens if I break bonus terms covers the consequences.
Gambling can be addictive. Free, confidential help is available 24 hours a day from the National Gambling Helpline on 0808 8020 133. Visit GamCare.org.uk and GamCare, or block yourself from all UK-licensed gambling sites with GAMSTOP.
This site contains adverts. We may earn commission when you sign up through our links. Advertiser disclosure.
We use no tracking cookies. We store one item in your browser to remember this notice. Casino sites may set their own cookies after you follow an advert link. Cookie policy
