- Fact-checked by Josh Miller
- Edited by Diana Westfield
How the lottery works is simpler than the Saturday night build-up makes it look. You pick a set of numbers, a machine picks its own, and the more of them match, the more you win. The interesting part is what happens to the money in between, and how long the odds really are once you put a number on them. If you just want that number for a particular game, the free CasinoCalcs lottery odds calculator has most of them loaded.
How the lottery works, from ticket to draw
Take a classic 6/49 game. You choose six numbers out of 49, or let the terminal choose them (a lucky dip or quick pick). At draw time six balls come out of the machine, often plus a bonus ball used for some of the lower prizes.
Match all six and you share the jackpot with anyone else who did. Match fewer and you drop into a lower prize tier. Most games pay something for three matches, and a few pay a free ticket for two.
What are the odds of winning the lottery?
For a 6/49 jackpot it’s 1 in 13,983,816. That figure is just the number of different six-number combinations you can make from 49 balls, and only one of them is drawn.
It’s hard to feel what 14 million means, so try this: buy one line for every draw, twice a week, and you’d expect to hit the jackpot once in roughly 134,000 years. Bigger games stretch it further. EuroMillions, where you also need two Lucky Stars from twelve, sits at 1 in 139,838,160. Our page on which lottery has the best odds lines the big ones up next to each other.
Every combination has exactly the same chance, by the way. 1-2-3-4-5-6 is as likely as any spread of birthdays; it just doesn’t look that way.
Where your ticket money goes
Only part of every ticket goes back out as prizes. In most big national lotteries it’s somewhere around half, with the rest split between good causes, the government and running costs. So on a £2 line, roughly a pound is coming back to players as a group, and almost all of it is concentrated in a handful of big winners.
That’s why the expected value of a ticket is nearly always well under its price. The lottery expected value calculator lets you put in a jackpot size and see how far short it falls.
Why jackpots roll over
Nobody matching all six is the normal result, not the exception. With 14 million combinations and a few million lines sold per draw, plenty of draws go unclaimed, and that jackpot money gets added to the next one. A few rollovers in a row and you get the headline figures.
Bigger jackpots do improve the value of a ticket, but they also pull in far more players, which raises the chance of sharing the top prize. It rarely tips a ticket into being a good bet.
Picking numbers
Your choice of numbers can’t change your odds of winning, but it can change how much you’d win. Lots of people play dates, so numbers 1 to 31 are crowded. If your combination wins and it’s a popular one, you could be splitting the jackpot several ways. Random picks, or numbers above 31, make that less likely. The lottery number generator does random lines if you don’t trust yourself to.
Syndicates
Joining a syndicate means more lines for the group, so a better chance that somebody in it wins, but you get a smaller slice. Per pound spent, the odds are exactly the same as playing alone. The lottery syndicate calculator shows how the shares split.
More lottery tools: EuroMillions odds calculator, Lotto Max odds calculator, combination calculator.
How much is a lottery ticket in the UK?
Lotto is £2 a line, EuroMillions £2.50, Set For Life £1.50 and Thunderball £1. The People’s Postcode Lottery is a subscription at £12.50 a month. Prices last checked in November 2026. For the draw days and times, see how to play Lotto and how to play EuroMillions.
How to buy lottery tickets
In any shop with the lottery terminal, or online through the official site or app after setting up an account. You must be 18 or over. Online play has one practical advantage: winnings are checked and paid for you, so a forgotten ticket in a coat pocket can’t cost you a prize.
What happens when you win the lottery?
Small prizes are paid at the shop counter or straight into your online account. Bigger ones are claimed through the operator, and for a life-changing win they’ll arrange a meeting, financial and legal advice, and ask whether you want publicity, which is your choice. UK lottery wins are tax-free. You have 180 days from the draw to claim. If the first thing you’d ask is what the prize actually is, the UK Lotto prize calculator works it out.