How much a casino bonus is worth

How much a casino bonus is worth: the short answer

A casino bonus is worth its expected value: the average amount it returns to you after every condition has been met. That figure is almost always lower than the headline, because the bonus has to be played through on games that carry a house edge, and because the qualifying deposit or bet costs something too.

Two numbers decide nearly everything. The first is the size of the bonus or the total stake of the spins. The second is how much play the terms demand before money becomes withdrawable, multiplied by the edge of the games you play. Get those two figures and you can price any offer in about a minute.

This page works through the sums for the main offer types on our casino bonuses hub, using real UK terms. It treats a bonus as a discount on entertainment that costs money, not as income. Over time the house edge means you should expect to lose more than any bonus gives back.

The casino bonus value formula in plain words

Every bonus can be priced with the same three-part sum. Start with what the bonus pays on average, take off the expected cost of any wagering, then take off the expected cost of the play needed to qualify.

The house edge is simply 100% minus the RTP. A slot with a 96% RTP has a 4% edge, so every £100 you stake loses £4 on average. That is the same expected value logic used everywhere in casino maths: expected loss equals amount staked times edge.

The figures in this formula are long-run averages. A single bonus can pay nothing at all or a lot more than average. The formula tells you which offer gives more for your money, not what will happen in one session.

What a free spins bonus is worth

Spin offers are the easiest to value. Multiply the number of spins by the stake per spin to get the total amount staked for you, then multiply by the game’s RTP. If winnings are paid without wagering, that is very close to the full value.

The 96.71% figure is the developer’s published RTP for Big Bass Bonanza; 96% is used elsewhere as a round example, because selected-game lists change. The game’s help screen shows the RTP the casino actually runs, so check it before you play the spins.

There is a lot more to say about spins, from spin values to expiry and maximum winnings, and our page on what free spins are worth goes through it in detail. For a basic guide to how spin offers are structured, see free spins.

How much a matched deposit bonus is worth after wagering

A deposit match adds bonus funds that must be wagered before they can be withdrawn. The cost of that wagering is the part most players never calculate, and it is the part that decides the real value.

Worked example: a 50% match up to £100 at 10x

1. Deposit £200 and receive a £100 bonus (50% of the deposit).
2. Work out the wagering: 10 × £100 = £1,000 of bets on eligible games.
3. Price the wagering: on slots with a 96% RTP the edge is 4%, so £1,000 × 4% = £40 expected cost.
4. Take the cost from the bonus: £100 − £40 = about £60 of average value.
5. Check the limits that could cut this further: a £5 maximum bet, a 7-day deadline and game restrictions.

Worked example: a 100% match up to £25 at 10x

Deposit £25 and receive £25. Ten times the bonus is £250 of wagering. At a 4% edge that costs about £10, leaving roughly £15 of average value. A cap on bonus winnings (for example £1,000) rarely changes the average at this size, but it matters if you hit a large win.

The same sum explains why the 10x wagering cap matters so much. Under the old style of 35x terms, the same £25 bonus would have needed £875 of play, costing about £35 at 4%. That is more than the bonus itself, so its average value was below zero.

Wagering cost table: casino bonus value by edge and multiplier

Use this table to see how quickly wagering eats into a £50 bonus. The edge column assumes you play eligible games with that house edge throughout; higher-RTP games cost less to clear.

Read across any row and the lesson is the same: the bonus loses value with every extra pound you must stake. More detail on how play-through rules work is on our page on wagering requirements.

Terms that change what a bonus is worth

The formula above assumes nothing else gets in the way. In real terms and conditions, several rules can lower the value or make it harder to reach.

• Game weighting. If a game counts at 10% towards wagering, each £10 bet clears only £1, so the effective wagering is ten times larger. Table and live games are often excluded or count for less, so check the terms. See game weighting.
• Maximum bet. A cap such as £5 per bet while a bonus is active stops you speeding through wagering with big stakes. Our max bet rule page explains how breaches are handled.
• Time limits. Seven days for £1,000 of wagering means about £143 of bets a day. If you can’t comfortably do that within your budget, the real value is lower.
• Maximum winnings. A cap on what bonus play can pay out trims the rare big result, which slightly lowers the average.
• Payment exclusions. Some deposit methods don’t qualify. Our page on payment method exclusions lists the common ones.
• Spin value and selected games. A spin fixed at 10p on a list of chosen slots is worth exactly what the sum says, no more.

Under the Gambling Commission’s rules, the significant terms must appear with the headline offer, with full terms no more than one click away. The Commission’s guide on fair and transparent terms (opens in a new tab) sets out what operators must do.

UK rules that protect bonus value

Several UK rules make it easier to work out what an offer is worth, and harder for terms to take it away.

The Commission’s consumer page on free offers and bonuses (opens in a new tab) says companies should make clear whether you are playing with your own money or bonus funds. That split matters for value: winnings from your own balance are yours, while bonus winnings can carry wagering. For the full rulebook, see UK casino bonus rules.

How to compare bonuses for the best value

When two offers look similar, run them through the same short checklist. The aim is not to find a bonus that beats the casino, because none does, but to spend a budget you had already set aside in the cheapest way.

1. Write down the total bonus cash, or spins × spin value.
2. Note the wagering multiple and whether it applies to the bonus only.
3. Find the RTP of the eligible games and turn it into an edge (100% − RTP).
4. Multiply total wagering by the edge to get the expected cost.
5. Subtract that cost, plus the edge on any qualifying bet, from the bonus.
6. Check the time limit, max bet and winnings cap against your own budget and time.

Comparing like with like also means asking what you would play anyway. If you mainly play blackjack, a slot-only offer has close to zero value for you, however generous it looks. Our guide on whether to take a casino bonus covers that decision.

Casino bonus value myths

The most expensive myth is that a bonus pays for itself if you keep playing. It doesn’t. Every extra pound staked carries the edge, so playing longer to chase a bonus balance adds cost. For the bigger picture, see are casino bonuses worth it.

Where our partner offers fit on value

Our three closest partner offers are slot spin offers with no wagering on spin winnings, so the sums above are simple. All are for new customers aged 18+ and full terms apply.

• Coral: bet £10 on slots, get 100 free spins at 10p each on selected games (£10 face value); 48 hours to accept, valid for 7 days, no wagering on spin winnings. The offer runs from 1 October 2026 to 1 February 2027. Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards don’t qualify.
• PlayOJO: 80 free spins on Big Bass Bonanza at 10p each (£8 face value, about £7.74 on average at 96.71%) with a first deposit of £10 or more; no wagering, winnings paid in cash. Excludes Northern Ireland and can’t be combined with other offers.
• Ladbrokes: play £10 on slots, get 50 free spins a day for the first 10 days, up to 500 at 10p each (up to £50 face value); claim before 23:59 each day, valid for 7 days, no wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits don’t qualify.

Coral and Ladbrokes are both run by LC International Limited, so you may not be able to open new accounts at both. These offers don’t apply to blackjack, roulette or live tables; for those, check the casino’s own lobby and terms.

18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.