About Casino Odds
An independent reference to the maths of casino games and UK lotteries. We explain what each bet pays, how often it wins and how much of every stake the house keeps. That is all we do.
What this site is
Casino Odds is a reference, in the way a dictionary or a timetable is a reference. It covers 6 casino games, 8 UK lottery draws and games, and 5 free calculators, and every page is built around the same question: what are the real chances, and what does the bet cost? The answer is always a number worked out from the rules of the game, set out so you can follow the working and check it yourself.
We started from a simple observation. The odds of casino games are not secret. A roulette wheel has a fixed number of pockets, a pair of dice has 36 combinations, and a lottery draw is a matter of counting the ways to choose numbers. Yet these facts are usually found scattered across pages that also want to sell you something. We wanted one place where the arithmetic stands on its own, written in plain English, with nothing attached.
The best way in is the casino odds table on the home page, which ranks the main casino bets from the lowest house edge to the highest, and the house edge explained page, which shows where that margin comes from. For the draws, UK lottery odds compares every game side by side.
What you will not find here
There are no casinos here, and no links to them. We do not review, rate or rank gambling companies, we carry no offers or bonuses, and nothing on the site is for sale. You cannot open an account, place a bet or play a game for money on this site, and we do not take payment from anyone to mention a product. The simulators on the game pages count outcomes over thousands of rounds so you can watch the probabilities settle; they involve no stakes, no credits and no prizes.
Lottery operators appear by name where the name is a fact you need, for example who runs a draw or which rules document a prize table comes from. That is information, not a recommendation.
How the figures are produced
Every figure is calculated, not copied. Where a game can be counted exactly we count it: every pocket on a wheel, every roll of the dice, every deal from an eight-deck baccarat shoe, every combination of lottery numbers. Blackjack is worked out exactly for every starting hand. Where exact counting is impractical, as with some poker questions before the flop, we simulate a large number of deals and say so. A separate program then recomputes the figures by a different method, so that a slip in one does not pass unnoticed.
The full method, game by game, together with our rounding rules and the sources for lottery prize tables, is on the how we calculate the odds page.
Editorial independence
No gambling company has any say over what we publish. Because we earn nothing from any operator, there is no reason for us to present one game as better value than the maths says it is. If a bet is poor value, we say so plainly; if a popular belief is wrong, such as the idea that a run of reds makes black more likely, we explain why. The site is written by its editors, and when this page says "we", that is who it means.
All pages were published together as a single edition, dated 2 October 2026. When a game changes its rules, as UK Lotto did in 2026, the affected pages are updated and the date says so.
Corrections
If you think a figure is wrong, we want to know. Tell us which page and which number, and if you can, how you worked it out. A figure only ever changes by being recalculated from the rules of the game, and where we have made a mistake the corrected page is the answer. The contact page explains what to include.
Understanding the odds is useful, but it does not make gambling a way to make money. If you want to talk to someone about your gambling, the responsible gambling page lists free and confidential help.