Casino bonus value is the average amount an offer is worth once you subtract the expected cost of any wagering, and you can work it out with two short formulas. For spins it is spins × spin value × RTP; for a match bonus it is the bonus minus wagering × house edge. This guide walks through both with real UK offers checked on 5 October 2026, shows how RTP and the 10x cap change the answer, and explains why an average is never a promise.
No-wagering spins: value ≈ number of spins × spin value × RTP, so 100 spins at 10p on a 96% game average about £9.60.
Match bonuses: value ≈ bonus − (wagering × house edge), so a £100 bonus with £1,000 of wagering at 96% RTP averages about £60.
The 10x cap since 19 January 2026 keeps most bonus values positive on average; older 35x–50x offers often averaged below zero.
Every figure is a long-run average: single sessions vary widely, losses are likely over time and caps and deadlines trim the value.
Spins formula
Spins × spin value × RTP
Match formula
Bonus − wagering × house edge
Wagering cap
10x bonus funds since 19 January 2026
Example RTP used
96% (4% house edge) unless stated
Offers checked
5 October 2026
What casino bonus value actually means
When people talk about the value of a casino bonus, they usually mean its expected value: the average result if the same offer could be played out thousands of times. It is a way of comparing offers on an even footing, not a forecast of what will happen to you. One person may win £60 from a set of spins while the next wins nothing; the expected value describes the middle of that spread.
Two numbers drive the sums. The first is the face value of the bonus in pounds. The second is the cost of the play the terms require, which depends on the game’s return to player (RTP) and therefore its house edge. A 96% RTP slot has a 4% edge: for every £100 staked, about £4 is kept by the game over the long run. The glossary entry on expected value covers the general idea.
Casino bonus value for no-wagering spins
Spins with no wagering are the simplest case, because winnings are paid as cash. The formula is: number of spins × value per spin × RTP. The RTP is the published figure for the version of the game the casino runs; the game’s help screen shows it, and some slots come in several RTP versions.
Expected value of no-wagering spins offers
Offer (18+, T&Cs apply)
Face value
RTP assumed
Average value of the spins
Coral: 100 spins at 10p
£10.00
96% (selected games vary)
About £9.60
PlayOJO: 80 spins at 10p on Big Bass Bonanza
£8.00
96.71% (published default)
About £7.74
Ladbrokes: up to 500 spins at 10p
Up to £50.00
96% (selected games vary)
Up to about £48 if all 10 days are claimed
Then account for the qualifying play. Coral asks you to bet £10 on slots before the spins arrive. At 96% RTP that £10 of play costs about 40p on average, so the offer’s net average value is nearer £9.20. PlayOJO requires a £10 deposit but not a qualifying stake, so the deposit itself is not consumed unless you choose to play it. Read more in how free spins work and free spins winnings explained.
Casino bonus value for deposit match bonuses with wagering
For bonus funds with a playthrough, a practical approximation is: bonus − (wagering total × house edge). The wagering total is the bonus multiplied by the wagering requirement. It is an approximation because players sometimes run out of balance before finishing, and caps on winnings trim the best outcomes, but it ranks offers sensibly.
Expected value of match bonuses at 96% RTP
Offer (18+, T&Cs apply)
Deposit
Bonus
Wagering (10x)
Expected cost (4%)
Average value
Casumo 50% up to £100
£20
£10
£100
£4
About £6
Casumo 50% up to £100
£100
£50
£500
£20
About £30
Casumo 50% up to £100
£200
£100
£1,000
£40
About £60
10bet 100% up to £25
£25
£25
£250
£10
About £15
These figures assume the whole wagering is completed on games that count 100% at 96% RTP. Lower-RTP games, reduced game weighting or a missed deadline all reduce the value. Our wagering calculator does the wagering arithmetic for any offer, and how to calculate wagering shows the working.
How RTP changes the value of a casino bonus
The game you play to clear wagering matters more than most people expect. Here is the £100 Casumo bonus, with £1,000 of wagering, at three RTP levels.
Same £100 bonus, different RTPs
Game RTP
House edge
Expected cost of £1,000 wagering
Average bonus value
97%
3%
£30
About £70
96%
4%
£40
About £60
94%
6%
£60
About £40
92%
8%
£80
About £20
Some popular slots are offered in several RTP versions, and the version a casino runs is shown in the game’s information screen. Our guide to checking a slot’s RTP explains where to look, and RTP range explains why one game can have several figures.
How the 10x cap changed casino bonus value in 2026
Before 19 January 2026, wagering of 35x or 50x was common. The Gambling Commission’s own example when announcing the change was a £10 bonus with 50x wagering, which needed £500 of play. At a 4% edge that £500 costs about £20 on average, so the bonus averaged around minus £10: a negative expected value.
A £100 bonus under old and new wagering levels (96% RTP)
Caps on winnings: 10bet’s welcome bonus limits bonus winnings to £1,000. Caps remove the rare large outcomes, which lowers the average slightly and the upside a lot. See max win.
Short deadlines: 3 or 7 days to wager means a fast pace of play; if you stop early, the bonus is lost, which can push value towards zero.
Maximum bet: Casumo’s £5 limit stops very large stakes; breaking it can void winnings, as explained in max bet rule.
Excluded or low-weighted games: forcing play onto lower-RTP games increases the cost.
Payment exclusions: if your method does not qualify, the value is zero.
Why an average is not a result: variance and bonus value
Expected value describes the long run. Your single attempt sits somewhere on a wide spread, and high-volatility slots make that spread wider. With 100 spins at 10p, many outcomes return a few pounds, some return nothing and a small number return much more. With £1,000 of wagering on a £200 balance, a large share of attempts end with the balance spent before the wagering is finished.
That is why the right question is not “what is this bonus worth?” but “what is it worth to me, given what I was going to spend anyway?” A bonus with an average value of £60 is still a way of spending money on entertainment, with losses likely over time. Our guides to volatility and the gambler’s fallacy explain why short sessions behave unpredictably.
How to calculate casino bonus value yourself
Find the face value: spins × spin value, or deposit × match percentage up to the cap.
Find the wagering total: bonus × multiple. If there is no wagering, the total is £0.
Find the RTP of the game you will play, from its help screen, and turn it into a house edge (100% − RTP).
For spins with no wagering, multiply face value by RTP.
For bonus funds, subtract wagering total × house edge from the bonus.
Subtract the expected cost of any qualifying stake, such as £10 of slot play.
Ask whether the wagering pace and deposit fit your budget. If not, the practical value to you is below the average.
Offers used in these casino bonus value examples
The worked examples above used the following partner offers, checked 5 October 2026. Each is 18+, for new customers only, and full terms apply.
Coral Casino: bet £10 or more on slots for 100 free spins at 10p on selected games, with 48 hours to accept and 7 days to use; no wagering on winnings, and some payment methods are excluded. See Coral Casino.
PlayOJO: 80 free spins on Big Bass Bonanza at 10p after a first deposit of £10 or more, winnings paid in cash with no wagering; not available in Northern Ireland. See PlayOJO.
Casumo: opt in and deposit £20 or more for a 50% bonus up to £100, wagered 10x within 7 days with a £5 maximum bet. See Casumo.
The worked examples on this page use these three partner offers: two no-wagering spins offers and a 50% match with 10x wagering. 18+, new customers, full terms apply.
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 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.
Significant terms: 18+. New customers only. Opt-in required. 50% deposit bonus up to £100 on first deposit. Minimum deposit £20. 10x wagering on the bonus amount. Maximum bet or spin £5. Bonus valid for 7 days. Game, play and payment method restrictions apply. Full T&Cs apply. GamCare.org.uk
Read the Casumo reviewLicence: Recro Limited, UKGC account 61549. Offer checked 5 October 2026.
18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set deposit limits. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
How do you calculate the value of a casino bonus?
Use one of two formulas depending on the bonus type. For no-wagering spins, multiply the number of spins by the spin value and the game’s RTP: 100 spins at 10p on a 96% slot average about £9.60. For bonus funds with wagering, take the bonus and subtract the wagering total multiplied by the house edge: a £50 bonus with £500 of wagering at a 4% edge averages about £30. Then subtract the cost of any qualifying stake. Our wagering calculator handles the wagering part for you.
Are casino bonuses worth anything after wagering?
On average, most are worth something under the current UK rules, but the amount is smaller than the headline. Since 19 January 2026 wagering on bonus funds is capped at 10x, so a £100 bonus needs at most £1,000 of play, which at a 4% edge costs about £40 and leaves an average of about £60. Under older 35x or 50x terms, many bonuses averaged below zero. Averages hide wide swings, so any one attempt can end with nothing. See what is a fair casino bonus? for more.
What RTP should I use when working out bonus value?
Use the RTP shown in the help screen of the game you will actually play at that casino. Many slots are published in several versions, so the figure on a review site may not match the one live in your lobby. If you are comparing offers before choosing games, 96% is a reasonable round number for a typical slot, but recalculate once you know the game. Lower RTP versions increase the cost of wagering. Our guide on how to check RTP shows where to find the figure.
Is a no-wagering bonus worth more than a match bonus?
Not always; it depends on the size of each. Eighty no-wagering spins at 10p are worth about £7.74 on average on a 96.71% RTP game, while a £50 match bonus with 10x wagering at a 4% edge averages about £30. The match bonus has the higher average value but needs a larger deposit and £500 of play within a deadline. The no-wagering spins are cheaper to take part in and simpler to finish. Our no wagering vs low wagering page compares them in detail.
Does a cap on winnings reduce bonus value?
Yes, though usually by less than people think on average, and by a lot at the top end. A cap removes the rare outcomes where the bonus produces a very large win. Because those outcomes are rare, the average value drops only slightly, but the most you can take away is fixed. 10bet’s welcome bonus, for instance, has maximum bonus winnings of £1,000. If a cap is low relative to the bonus size, its effect is bigger. Our glossary entry on maximum cash-out explains the related terms.
Why is my actual result so different from the bonus value?
Because bonus value is a long-run average and a single session is one random draw. Slots, especially high-volatility ones, produce many small or zero returns and occasional large ones, so most individual results land well away from the average. That is normal and does not mean the game is unfair. Licensed games use tested random number generators, and the house edge applies over time. Our guides to volatility and random number generators explain the spread you see.
How did the 10x wagering cap change bonus value?
It made the typical match bonus positive on average. Before 19 January 2026, a £100 bonus with 50x wagering needed £5,000 of play, costing about £200 on average at a 4% edge, so the bonus averaged around minus £100. At 10x the same bonus needs £1,000 of play, costing about £40, for an average of about plus £60. The cap applies to every UK-licensed casino’s bonus funds. Our page on the 10x wagering cap covers the rule and its history.
Should I include my deposit when working out bonus value?
Include it only if the terms make you stake it. If a casino adds a bonus once you deposit, your deposit stays your own money and does not change the bonus value unless you play it. If the offer requires a qualifying bet, such as Coral’s £10 on slots, add the expected cost of that bet: about 40p at 96% RTP. If the wagering applies to deposit plus bonus, which some older offers did, the total to bet is larger and the value lower. Our qualifying deposit entry explains the terms.
Does a positive bonus value mean I should claim it?
No, a positive average only means the bonus offsets some of the house edge on play you were going to do anyway. It does not make gambling profitable, and losses remain likely over time. If claiming means depositing more than you planned, playing faster to meet a deadline or chasing the wagering after losses, the bonus is costing you. Decide your budget first and claim only if the offer fits it. If gambling is starting to feel hard to control, our free gambling support guide lists confidential help.
Gambling can be addictive. Free, confidential help is available 24 hours a day from the National Gambling Helpline on 0808 8020 133. Get free support from GamCare or NHS gambling support, or block yourself from all UK-licensed gambling sites with GAMSTOP.
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