One of the most highly sought-after features in casino games is the slot jackpot, which can be a game-changer in a single spin. Delving into the inner workings of how these jackpots roll and pay out uncover a captivating area of mathematics, probability, and game building that plays out flawlessly.
Magic of the numbers that slot machines roll.
All modern slots are based on a Random Number Generator (RNG), a powerful computer program that generates thousands of number sequences per second that represent the position of a particular symbol on the reels.
Return to Player plays a crucial role in jackpot design.
The percentage of money a slot pays back over millions of spins is what is determined by return to player or RTP, and in jackpot slots, part of every wager is added to the jackpot pot, it's what makes the jackpots grow so large over time.
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Slot Type
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Typical RTP Range
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Jackpot Contribution
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Standard Slot
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95% to 97%
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None
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Fixed Jackpot Slot
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94% to 96%
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None
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Local Progressive Slot
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93% to 95%
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1% to 2% per bet
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Networked Progressive Slot
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91% to 94%
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2% to 3% per bet
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Fixed Jackpots vs Progressive Jackpots
Both types of jackpots have their own set values; in the case of fixed jackpots, they are fixed and don't change; progressive jackpots rise with each individual wager made on the related game, sometimes a network of casinos running the same slot title at the same time.
Fixed jackpots are more consistent in their pay and always will be the same pay regardless of the amount wagered.
Local progressives only increase in a single casino, so pay out more often, but have a smaller pool.
Networked progressives are connected with different casinos and platforms and are able to deliver prize pools of millions of dollars within a few weeks.
A must-hit by progressives ensures that players have a tangible maximum winnings cap.
How the Jackpot Contribution Rate Works
Every wager made on a progressive slot machine contributes a small percentage to the progressive jackpot, typically 1% to 3%, and sites such as Spin Away Casino have an extensive selection of progressive slots that are helped by exactly this type of widespread network contribution.
The Probability of Hitting a Jackpot
The odds that a progressive jackpot will occur are intentionally set very low, typically from 1 in 10 million spins to even lower, such as 1 in 50 million spins, that encourages the large prize payouts.
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Jackpot Type
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Approximate Odds
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Average Pool Size at Win
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Mini Tier
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1 in 1,000
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Under $500
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Minor Tier
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1 in 50,000
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$500 to $10,000
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Major Tier
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1 in 1,000,000
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$10,000 to $100,000
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Grand Tier
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1 in 10,000,000+
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$1,000,000+
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Must-Hit-By and Seeded Jackpots
Some progressive slots have a "must hit" mechanic that guarantees that the jackpot will hit before it reaches a certain mark and seeded jackpots reset the jackpot to a good minimum value after winning it instead of the reset to zero value.
Multi-Tier Jackpot Structures
Many of the modern slot games will have different tiered jackpots, like Mini, Minor, Major, and Grand, and will come with different probability and value amounts, so that those with various budget levels have a realistic chance of hitting at least one of the tiers within a playing session.
The Maths of Jackpot Timing
Each spin is an independent one, controlled by the RNG, so that past spins have no meaning whatsoever for future ones, and so jackpots are no more likely to hit at specific times of the day, or after a specific number of spins.
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No memory of the spin, there will be no correlation between spins.
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The more spins played, the more times the jackpot odds will be exposed, but the chance of any single spin is the same.
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As jackpot meters rise, it does not mean that a paying machine is about to come along - it just means that more money has been contributed to a specific machine.
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The RNG is constantly running, so the results are random at 3am on Tuesday as much as they are at rush hour on a weekend.
Why people are inclined to bet on large jackpots.
There is a known effect that progressive jackpots above a certain mental value draw in far more players, which increases the pace at which the prize can increase and thus leads to a "runaway" effect which can cause a very large progressive jackpot to grow very rapidly in its last few days.
When the jackpot is won, what happens to it?
Once a progressive jackpot has been won, the jackpot starts again with a seeded minimum and the accumulation process resumes again and again – and most of the online casinos offering this type of progressive jackpot make the jackpot winner announcements public, in part as a way to let all the players know that these jackpots really can be won, and also as an extra safety measure of transparency.
