How to Use This Competition Odds Calculator
Enter the details of any UK prize competition — total tickets available, tickets remaining unsold, the price per ticket, how many you plan to buy, and the cash alternative value. The competition calculator updates in real time, showing you your win probability, estimated odds, total spend, and our proprietary Value Ratio.
The Basic Formula
Your raw chance of winning any raffle or giveaway is straightforward:
Example: buy 10 tickets in a giveaway with 5,000 remaining → 0.20% win probability, or 1 in 500.
What Are the Odds of Winning a Raffle With X Tickets?
The odds of winning a raffle depend on just two numbers: how many tickets you hold and how many tickets are in the draw. Divide the pool by your tickets and you get your “1 in N” odds. Here are some worked examples — plug your own numbers into the calculator above for an exact answer:
| Tickets you buy | Tickets in the draw | Win probability | Odds |
|---|---|---|---|
| 1 | 250 | 0.40% | 1 in 250 |
| 5 | 1,000 | 0.50% | 1 in 200 |
| 23 | 1,340 | 1.72% | 1 in 58 |
| 10 | 5,000 | 0.20% | 1 in 500 |
| 50 | 75,000 | 0.07% | 1 in 1,500 |
| 100 | 500,000 | 0.02% | 1 in 5,000 |
So the odds of winning with, say, 23 tickets out of 1,340 are 23 ÷ 1,340 = 1.72%, or roughly 1 in 58. Notice how buying more tickets in a huge pool moves your probability far less than entering a smaller, capped draw — that's exactly the trade-off the calculator makes visible.
Why You Need a Ticket Odds Calculator
A low ticket price does not mean good value. A 99p entry sounds cheap — but not if the competition has 250,000 tickets in the field. Our ticket odds calculator cuts through the marketing and shows you the mathematical reality.
- Spot poor value instantly. Compare your spend against your probability before committing.
- Find the sweet spot. Buying more tickets improves your odds, but beyond a certain point the extra cost outweighs the benefit. The slider shows you exactly where that is.
- Compare competitions head to head. Run the raffle odds calculator on two draws side by side to see which gives you better probability per pound.
- Understand tombola-style draws. Tombola and instant-win formats often have very different field sizes — plug in the numbers and see.
What Is the Value Ratio?
The Value Ratio is Competition Showroom's proprietary metric. It compares the total revenue the operator collects (total tickets × ticket price) against the cash alternative value of the prize.
A Value Ratio of 1.0 means the operator collects exactly the prize's cash value across all tickets — mathematically the fairest possible competition. Anything under 2.0 is considered strong value. Ratios above 3.0 indicate you're paying heavily over the odds.
Penny Raffle & Low-Cost Entry Tips
Penny raffle competitions (entries from 1p–50p) often have very large ticket pools — sometimes 500,000+. Our giveaway odds calculator will show you that even buying 100 tickets may only move your probability by a fraction of a percent. For penny competitions, look for draws with capped total tickets to keep odds meaningful.
How Competition Showroom Ranks Draws
We use the Value Ratio to surface the fairest competitions across 100+ UK operators every day. Our best-odds competitions page applies the same maths this calculator uses — automatically, in real time, across every live draw we track.
Frequently Asked Questions
How do I calculate the odds of winning a raffle?
Divide the number of tickets you hold by the total number of tickets in the draw, then multiply by 100 for a percentage. For example, 23 tickets out of 1,340 gives 23 ÷ 1,340 = 1.72%, or odds of roughly 1 in 58. The calculator above does this instantly for any numbers.
What's the difference between odds and probability?
Probability is expressed as a percentage (e.g. 0.5%). Odds are expressed as a ratio — “1 in 200” means the same thing. Our competition odds calculator shows both so you can use whichever format you find clearer.
Should I use total tickets or unsold tickets in the calculator?
Use unsold tickets remaining as your field size — that's the pool you're actually competing against. Total tickets tells you the maximum possible field; unsold right now is what matters for your live odds at the time of entry.
How accurate is this raffle odds calculator?
The maths is exact given the numbers you input. The key variable is the unsold ticket count — competition sites update this in real time, so for the most accurate result check the operator's live ticket counter just before you enter.
Can I use this as a tombola odds calculator?
Yes. Tombola-style draws work identically — set “total available” to the tombola's total stubs, “unsold right now” to the remaining unstubbed tickets, and “tickets to buy” to how many stubs you want to purchase. The win probability formula is the same.
What is a good Value Ratio?
We consider anything under 2.0 to be strong value — the operator is collecting less than twice the prize's cash value across the whole field. Our best-odds league table lists only competitions scoring well on this metric.