Entering several competitions at once? See your combined chance of winning at least one prize.
Each row needs a ticket cap and your entries (no more than the cap) to see the combined odds.
Results are estimates for guidance only and assume the inputs you provide — they aren't financial advice.
Why combined odds aren't just added up
Each competition is an independent draw, so the right way to combine them is through your chance of losing: multiply the losing probabilities together, and whatever's left is your chance of winning at least once. At long odds the result is close to a simple sum — three 0.1% chances combine to about 0.3% — but as odds shorten the sum overstates things badly, because it double-counts the scenarios where you win more than once.
The "expected wins" figure is that simple sum, and it answers a different question: across many repeats of this exact set of entries, how many wins you'd average. Use the at-least-one figure to set expectations for this week's entries, and the expected value calculator to decide which of those competitions deserve your tickets in the first place.
Frequently asked questions
How do I combine odds across several competitions?
You can't just add the percentages. Multiply together your chance of losing each competition, then subtract from 100%. Three comps at 1 in 1,000 each isn't 3 in 1,000 exactly — it's 1 − (0.999 × 0.999 × 0.999), about 0.3% — close to additive at long odds, but the gap grows fast as odds shorten.
Is it better to spread tickets across competitions or stack one?
For roughly equal odds and prizes, spreading slightly increases your chance of winning something, while stacking one competition gives a better chance at that specific prize. The bigger factor is usually value: put tickets wherever the expected return per £1 is highest, which you can check with our expected value calculator.
Why is my combined chance lower than the sum of the individual chances?
Because you can win more than one — some of the "extra" probability covers double wins, which the at-least-one figure counts only once. The expected number of wins (the simple sum) and the chance of at least one win are different questions; this calculator shows both.
We track thousands of live UK competitions with prices, ticket caps and end dates — so you can compare the odds before you enter.