Jackpot mechanics
How progressive jackpots work: seed, meter and trigger
The short answer
A progressive jackpot is funded by players: a small contribution from each wager increments the meter until someone hits the trigger, then the prize resets to its seed value. Wide-area progressives pool wagers across many casinos, which is how they reach seven figures; the trade-off is that the jackpot's expected value is funded out of the same total return, so the base game typically pays less than on a flat-top version.
In this article
The number climbing on the sign above the machines is not the casino's generosity on display — it is a savings account funded by everyone playing. A progressive jackpot takes a small percentage of each wager, adds it to a running meter, and pays the accumulated pool to whoever hits the trigger condition. When it hits, the meter resets to a seed value and starts climbing again.
The three pieces: seed, increment, trigger
- Seed: the value the jackpot resets to after a hit. Depending on the game's design, the seed is funded by the operator or advanced from the meter itself — the paytable or help screens usually state the reset value.
- Increment: the contribution rate — the slice of each wager (often a fraction of a percent to a few percent) routed to the meter. This is why the jackpot climbs faster on busy banks of machines.
- Trigger: the condition that pays it — a specific symbol combination, a mystery award at a random threshold, or a bonus feature. On many games the qualifying bet matters: below a stated minimum bet, the progressive may not be available.
Standalone, local-area and wide-area
Illustrative example
| Scope | Who feeds the meter | Typical size | Examples |
|---|---|---|---|
| Standalone | Only wagers on that one machine | Smallest — hundreds to low thousands | A single machine with a top award that climbs slowly |
| Local-area (LAP) | Machines linked within one property or casino group | Mid-range — thousands to tens of thousands | A bank or property-wide link under one brand |
| Wide-area (WAP) | Machines across many casinos and sometimes multiple states | Largest — can reach seven or eight figures | Networked branded progressives like long-running multi-state links |
What the jackpot costs the rest of the game
The progressive's expected value is part of the game's total return, not a bonus on top of it. When a slice of each wager goes to a jackpot that hits rarely, the base game pays out less in ordinary wins — which is why progressive versions of a title often feel tighter between features. The meter contributes real expected value only when you win it; for the vast majority of spins it is simply a deduction. Technical standards for gaming devices treat progressive meters, increments and seed handling as regulated parts of the game — GLI-11, for example, addresses progressive operation in its device requirements — so the advertised mechanics are certified behavior, not loose promises.
Progressives are a redistribution of return, not free money — understanding that trade-off connects directly to what RTP measures, why hit frequency and return are different things and what volatility does to a session.
