Contest & Raffle Win Probability Calculator
All tickets have equal chances and winners are drawn without replacement.
How it works
All tickets have equal chances and winners are drawn without replacement. You may own multiple tickets and win more than once. The result is the chance that at least one of your tickets wins.
The model does not cover weighted entries, judging, disqualifications, replacement draws or rules limiting each person to one prize.
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How the Contest & Raffle Win Probability Calculator works
All tickets have equal chances and winners are drawn without replacement. You may own multiple tickets and win more than once. The result is the chance that at least one of your tickets wins.
One winner versus several winners
With 1 ticket among 120 and one prize, the chance is 1/120 ≈ 0.83%; the printed ticket number does not matter. With 10 tickets among 100 and three winning tickets, the chance of at least one win is about 27.35%, not 30%. Expected winning tickets is 0.3, a different measure. Compare odds formats with Odds Converter.
The model does not cover weighted entries, judging, disqualifications, replacement draws or rules limiting each person to one prize.
FAQ
Does buying twice as many tickets double my chance?expand_more
With one winning ticket and a fixed total number of entries, yes. With several winning tickets, the chance of at least one win follows the combination formula and is not generally linear.