Progressive jackpot explained
A progressive jackpot is a slot prize that grows with every qualifying bet until one player wins it, then resets to a starting amount and builds again. Below, we follow a pot through its whole life, show the maths of how fast it grows and what it costs you in RTP, and explain how stake size and UK limits affect your chances.
By the Best Slots UK team. Last checked .
Key takeaways
- The pot starts at a seed amount, grows from a slice of each stake, pays once, then resets.
- Network progressives link many casinos, so pots grow faster and larger than standalone ones.
- On many games, a bigger stake raises the trigger chance, but UK limits cap stakes at £5 (£2 for 18–24s).
- The jackpot slice comes out of the RTP, so ordinary wins return less than on a non-jackpot slot.
- Category
- Jackpot type
- Prize
- Grows until won, then resets
- Funded by
- A share of each qualifying stake
- Scales
- Standalone, local or network
- Well-known families
- Mega Moolah, Age of the Gods, Mega Fortune
Progressive jackpot meaning in plain English
Think of a progressive jackpot as a shared jar. Every time someone plays a linked slot at a qualifying stake, a few pence from that bet drop into the jar, and the number on screen ticks up. When the game’s random number generator produces the jackpot outcome for one player, that player takes the jar, and the operator puts a fresh starting sum, called the seed, back in.
The opposite is a fixed jackpot, which pays a set multiple of your bet and never grows. Most progressive games also keep a set of smaller tiers, so the label ‘progressive’ usually describes the top prize, and sometimes one or two below it, rather than every jackpot on the screen. For the wider picture of prize types, see our jackpot entry.
The life of a progressive pot: seed, growth, win, reset
Every progressive jackpot follows the same cycle, whatever the studio or theme:
- Seed: the provider funds a starting amount so the pot is never empty after a win.
- Contribution: a fixed percentage of each qualifying bet is added to the pot (and often a smaller percentage to a reserve that pays the next seed).
- Trigger: on any spin, the game may award the jackpot feature, often a wheel, a pick game or a special symbol combination.
- Award: the winning player is credited with the pot value at that moment, subject to the casino’s verification checks.
- Reset: the pot drops back to its seed value and the cycle starts again.
Because the pot only resets when won, its size at any moment tells you how long it has gone without paying, not how soon it will pay. A large pot is not ‘due’. The only exception is a must-drop jackpot, whose rules set a deadline.
Standalone, local and network progressives
Where the contributions come from decides how fast a pot grows and how big it can get.
| Scale | Who feeds the pot | Typical pot size | What it means for you |
|---|---|---|---|
| Standalone | Only players on that one game at that one casino | Smaller | Slower growth; top prize more modest |
| Local or in-house | Players on a group of games at one operator or group | Medium | Shared across one brand’s lobby |
| Network (wide-area) | Players on the same game family across many casinos | Largest | Fastest growth; same pot whichever licensed casino you use |
Branded families such as Mega Moolah and Playtech’s Age of the Gods run network pools, which is why the same jackpot figure appears at different casinos.
A worked example: how a progressive pot grows, and what it costs
The figures below are illustrative, because studios rarely publish their exact contribution rates. Suppose 2% of each stake goes to the top pot, the average spin on the network is 60p, and players across all casinos make 50,000 spins an hour.
- Contribution per spin: 60p × 2% = 1.2p.
- Growth per hour: 50,000 × 1.2p = £600.
- Growth per week, at that rate around the clock: £600 × 168 = £100,800.
That contribution is part of the slot’s RTP, not extra. If a game returns 92% in total and 2 percentage points of that sit in the jackpot, ordinary line wins and features return about 90%. Studios often say so plainly: Age of the Gods lists 95.02% including the jackpot contribution, and Mega Fortune is listed at about 96% to 96.6% including jackpots. Mega Moolah’s listed figure is 88.12%.
For a player who never hits the top prize, which is almost everyone, the effective return is the lower, non-jackpot figure. On 500 spins at 20p (£100 staked), a 90% return means a theoretical cost of £10, against £4 at 96%.
Best-known progressive jackpot slots
| Slot | Developer | Listed RTP | Volatility | Jackpot structure |
|---|---|---|---|---|
| Mega Moolah | Games Global | 88.12% | Medium | Four tiers: Mini, Minor, Major, Mega |
| Mega Fortune | NetEnt | About 96%–96.6% (includes jackpots) | Low to medium | Three tiers: Rapid, Major, Mega |
| Age of the Gods | Playtech | 95.02% (includes jackpot contribution) | Medium | Four tiers, topped by Ultimate Power |
| Hall of Gods | NetEnt | About 95.5% (includes jackpots) | Low to medium | Tiered, with a progressive Mega |
| Divine Fortune | NetEnt | 96.59% | Medium | Tiered progressive jackpots |
| Jackpot Giant | Playtech | 94.22% | Not published | Progressive jackpot |
| Mega Joker | NetEnt | Up to 99% (top stake with Supermeter) | High | Random progressive jackpot |
Notice how widely the RTPs vary. A progressive does not automatically mean a poor return, but it does mean a share of that return is locked in a prize few players see. Our progressive jackpot slots page compares more games.
Does a bigger stake improve your progressive jackpot chance?
On many modern progressives, yes: the chance of triggering the jackpot feature is weighted by stake. If a game works this way, a £1 spin has ten times the trigger chance of a 10p spin, but it also costs ten times as much, so the jackpot chance per pound staked stays the same. Betting more does not make a progressive better value; it makes each spin more expensive.
Some older games went further and made the top prize available only at certain stakes. Either way, UK stake limits mean you can bet no more than £5 a spin at 25 and over, or £2 at 18 to 24. Features cannot be bought in Great Britain, so there is no shortcut into a jackpot wheel. Our guide should you bet max works through the numbers.
Advantages
- Pots can reach sums no single slot’s maths could pay
- Network pots are the same size at every casino that carries them
- Most games keep smaller tiers that land more often
Drawbacks
- Part of every stake goes to a prize you are unlikely to win
- Base-game RTP is often noticeably lower
- Trigger odds are almost never published
Related progressive jackpot terms
- Must-drop jackpot: a progressive with a deadline or cash cap.
- Fixed jackpot: a prize set as a multiple of stake.
- RTP range: why jackpot slots can run at different returns between casinos.
- Demo mode: play-money versions, available after age verification, that show the jackpot but never pay it.
Before you play any progressive, decide how much the session is worth to you as entertainment. Our slot budget guide and the question are jackpot slots worth it help you weigh the trade-off honestly.
18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set limits. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
How does a progressive jackpot work?
A progressive jackpot takes a small percentage of each qualifying bet and adds it to a prize pot that keeps growing until someone wins it. When the random number generator awards the jackpot to a player, they receive the full pot, and the pot drops back to a seed amount funded by the provider. Pots can be standalone on one game, shared across one casino, or linked across many casinos on a network. The contribution comes out of the slot’s RTP. Our jackpot entry compares this with other prize types, and jackpot slots lists games.
What is the seed amount on a progressive jackpot?
The seed is the starting value a progressive pot resets to after it has been won. The provider funds it, usually from a reserve built up by setting aside a small extra slice of each contribution, so the pot never starts from nothing. Larger networks set high seeds to keep the headline figure attractive straight after a win. The seed is part of the game’s maths and so sits inside its RTP rather than being extra money. The RTP guide explains how these slices add up, and progressive jackpot slots shows how different families compare.
Is a big progressive jackpot more likely to pay soon?
No. A large pot only means it has gone a long time without being won; the chance on your next spin is the same as it was when the pot was small. Each spin is independent, decided by the random number generator. The only progressives that behave differently are must-drop jackpots, whose rules force a payout before a deadline or cash cap. A rising number is not a signal to stake more or play longer. Read do slots get hot or cold and our must-drop jackpot entry for the difference.
Why is Mega Moolah’s RTP so low?
Mega Moolah lists an RTP of 88.12%, lower than most slots, because a large share of each stake feeds its progressive jackpot tiers instead of ordinary wins. Over the very long run the jackpot is returned to players, but it is concentrated into rare payouts that almost nobody receives. For a typical session, the base game therefore returns noticeably less than a 96% slot. That is the cost of a chance at the network pot, and it is why a progressive is best treated as entertainment rather than value. See our Mega Moolah review and what is a good RTP.
Can you win a progressive jackpot on free spins?
Sometimes, but it depends on the game’s rules and the casino’s promotion terms. Some jackpot games allow the jackpot to trigger during promotional spins, while others exclude bonus-funded play or spins below a minimum stake. Many welcome spins are set at 10p on named games that may not carry a progressive at all. Always read both the slot’s help screen and the offer’s terms before assuming a jackpot is possible. Our page on jackpot free spins explains the usual conditions, and spin value shows how 10p spins affect potential wins.
Are progressive jackpots paid as a lump sum?
Online slot jackpots are generally credited to your casino balance as a single cash sum, but the game rules and the casino’s terms set the exact method, so check them. Before releasing a large payout, a UK-licensed casino will usually complete identity and source-of-funds checks, which can take some time. Once you request a withdrawal you cannot reverse it, as reverse withdrawals are banned in Great Britain. Winnings are not taxed for UK players. See what happens when a slot hits max win and our KYC entry.
Can I play progressive jackpot slots in demo mode?
Many progressive slots have play-money demo versions, but in Great Britain you can only use them after your age has been verified, a rule in place since 2019. In demo mode the jackpot display may still appear and the feature may still trigger, but no real money is paid and the pot is not the live network pot. A demo is useful for learning how the jackpot wheel or pick game works, but it says nothing about real-money odds. Read what is a slot demo and our demo mode entry for the details.