Part of the complete guide: Lottery odds: the complete guide
How a rollover works
In a jackpot game, a share of ticket sales is added to the jackpot pool each draw. If someone matches the winning numbers, they win the jackpot and it resets to its starting amount. If not, the unwon jackpot stays in the pool and the next draw's contribution is added, so it grows. Lower prizes are paid every draw, and are not rolled over.
Why rollovers are so frequent
With jackpot odds near 1 in 292 million, even if tens of millions of tickets are sold in a draw, the most likely outcome is that nobody wins. If 50 million random tickets are sold, the chance of at least one jackpot winner is about 16%. At 100 million tickets it is about 29%. Lotteries deliberately choose long odds because rollovers produce giant jackpots that draw in more players.
| Tickets sold in a Powerball draw | Chance of at least one jackpot winner (random picks) |
|---|---|
| 25 million | about 8.2% |
| 50 million | about 15.7% |
| 100 million | about 29% |
| 200 million | about 50% |
| 300 million | about 64% |
Do rollovers change your odds?
No. Your chance of the jackpot is the same each draw, 1 in 292 million for Powerball. A rollover only changes the size of the prize and how many other people are playing. A jackpot that has rolled for months is no more "due" than one that has just reset.
Caps, must-win draws and other rules
- Some games, such as EuroMillions, have a jackpot cap, after which extra money flows to lower prize tiers.
- Some have a must-win draw after a set number of rollovers, when the jackpot is shared among the next tier if nobody matches.
- Rules differ and change. Check the official rules of your game.
Example: a jackpot that rolls for ten draws
Suppose a game starts at $50 million and each draw adds $15 million when no one wins, with 60 million tickets sold per draw. The chance that nobody wins in a draw is about 81%, so the chance of ten consecutive draws without a winner is about 12%. Ten rollovers would take the jackpot to around $200 million. By then, sales might have doubled, so the jackpot grows faster and the chance of a winner in any one draw rises to about 34%. This is the loop that produces headlines: every rollover makes the next one a little less likely but the prize a lot bigger.
Common mistakes around rollovers
- Buying many more tickets "because the jackpot is huge" and overspending.
- Believing a long rollover means a win is near. Each draw is independent.
- Forgetting that a bigger crowd raises the chance of sharing.
- Ignoring the cash option and tax, which turn the headline into a much smaller real amount.
A sensible approach
- 1Decide your usual budget before you look at the jackpot.
- 2Keep to it when the jackpot is large.
- 3Use the lottery tax calculator to see what the advertised amount is really worth.
- 4Enjoy the dream, and remember the odds.
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Frequently asked questions
What does lottery rollover mean?
That the jackpot was not won and is carried over to the next draw, usually growing.
How long can a jackpot roll over?
Until someone wins, unless the game has a cap or must-win rule. Powerball and Mega Millions have gone through dozens of draws without a winner.
Is it better to play when the jackpot has rolled over?
Your odds are the same. A bigger jackpot is more exciting but also means more people playing and more risk of sharing.
Do smaller prizes roll over?
No. Lower tiers are paid every draw from that draw's sales.
What is the longest lottery rollover?
Big US jackpots have gone through three months or more of draws without a winner. Check the lottery's records for current figures.
Does the lottery profit from rollovers?
Rollovers drive higher sales, so the operator and beneficiaries benefit from the extra tickets sold.
Is a smaller jackpot better value?
Per ticket the odds are the same. Smaller jackpots mean fewer co-winners on average.