Progressive jackpot: where the pot comes from and why it climbs so high

A progressive jackpot is a pot that grows with every stake placed on the games linked to it, until one player wins it. The meter ticking over on screen looks like pure chance. Yet everything rests on three settings: the share taken from each stake, the starting amount and the probability of the pot dropping.

Those three figures explain why some pots drop often for modest sums while others pass the million mark. They also show what the pot costs the rest of the game, and why no amount on display makes a title any easier to win.

What is a progressive jackpot compared with a fixed one?

A fixed jackpot is written into the paytable. It is a multiple of the stake, the same from one round to the next: if the combination lands, it pays that amount, and nothing builds up between players.

A progressive jackpot has no set value. It begins at a starting amount, and every stake on the games concerned adds a fraction to it. As long as nobody has won it, the meter only goes up. A single title can even combine both: fixed wins in its paytable, and a progressive pot on top.

The four-stage life cycle of a pot

Every pot goes through the same stages. It opens at a starting amount set in its rules. It grows with every stake, by the set percentage. It drops. Then it returns to its starting amount and the whole thing begins again.

The drop takes one of three forms: a random draw that can happen on any stake, a ceiling the pot is not allowed to pass, or a deadline by which it must have dropped. All three exist side by side at Dragon Casino: each of the jackpots shared across the platform follows one of these forms.

For pots that belong to a single game or series, you can follow the meters live among the games that carry a pot, where each title's rules state which form applies.

What a progressive jackpot takes from each stake

The share that goes into the pot varies from game to game, and there is no standard rate. To see the mechanism at work, take an illustrative example that matches no particular title: a game with a stated return to player of 96%, of which 1% goes into the pot.

Over a million spins at €1, players stake €1,000,000. Ordinary wins pay back €950,000 on average, the pot €10,000, and the remaining €40,000 is the game's margin. That 1% does not vanish, then: it really does reach players, only concentrated on one of them.

Hence a general rule: at the same stated rate, a game with a pot pays back a little less through its ordinary wins than one without. When a title has several jackpot levels, the share taken is usually split between them. For more on what RTP actually measures and what it cannot tell you about a single session, a separate article on the blog covers it.

Why some pots pass the million mark

The average size of a pot is no mystery: it follows from how rare it is. Back to the example. If every €1 spin has a one-in-a-million chance of triggering the pot, it takes a million spins on average for it to drop. At 1 cent taken per spin, it will have grown by around €10,000 above its starting amount.

Make the drop a hundred times rarer and the average growth is a hundred times larger. Multi-million pots combine a tiny probability with an enormous volume of stakes, which usually means linking many games, or even several casinos. The lower levels of the same game work the other way round: more likely, and therefore smaller.

One consequence is less intuitive. For a pot that drops at random, around 63% of payouts happen before it has reached its average growth. Record amounts grab the headlines, but the most common case is still a pot smaller than its rarity would suggest.

What are the odds of winning a progressive jackpot?

Let us keep the one-in-a-million chance from the example, chosen because it keeps the maths readable. At 1,000 spins a day, it would take 1,000 days on average, almost three years, to see the pot drop once. And that is only an average: it could drop on day one or keep you waiting far longer.

Over that million spins, the pot pays back on average what it took, namely 1% of stakes. Playing for the jackpot therefore does not change the game's overall return. It only changes how wins are spread: plenty of spins with nothing special, and, very rarely, a huge sum for one person.

That spread makes these games demanding on a budget, since the most attractive part of the return is also the least likely. Deciding how much to spend at the casino in advance remains the best habit, whatever figure is ticking over on screen.

From Megabucks to the world record: a short history of the pot

The first progressive jackpot linked across several casinos appeared in Nevada in 1986: IGT's Megabucks, whose pot grows with stakes from machines in different venues. The first big prize, $4,988,842, dropped on 1 February 1987.

Online, the first game with a progressive pot was Microgaming's Cash Splash, in 1998. Formats have multiplied since: mystery pots that drop at random, pots with a ceiling or a deadline, multiple levels, pick-and-win mini-games, and jackpots added to roulette, video poker or dice games.

The world record for an online slot was set in April 2021 in Belgium: €19.4 million on a game from the Mega Moolah network, won with a €15 stake. The previous record, around €17.9 million, dated from October 2015. Across the millions of players on these networks, such amounts show how rare the pot is; they are not a realistic expectation.

Common myths about progressive jackpots

‘With lots of players around, my chances go down.’ Your probability on each spin depends solely on the game's rules. Other players make the pot grow faster and drop more often for someone else, without taking anything away from your own chance.

‘The pot is a gift from the casino.’ It is fed by players' stakes, spin after spin; that is in fact the only thing that makes it grow.

‘A jackpot game pays back more.’ The stated rate already includes the pot's share. At the same rate, the game with a pot does not pay back more: it distributes differently.

‘The casino decides when it drops.’ The drop depends on the game's random number generator, certified by an independent laboratory. Nobody chooses either the moment or the winner.

Dragon Casino, the online casino licensed in Belgium under licence B+3817, shows every meter live on the game concerned. The reasoning holds everywhere: a tiny deduction from each stake, a very small chance, and an amount that says nothing about your odds.

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