AI lineup duplication calculator: the odds someone else built your exact lineup
DFS duplication calculator: from the field size and each player's ownership, the number of entrants likely holding your exact lineup and the chance you are unique.
Nothing is worked out until you tap. Five runs a day, unlimited with a Velvet seat.
How it works
Treating each player's ownership as independent, the chance a random entrant built your lineup is the ownerships multiplied together; across the field that gives the expected number of copies.
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About the DFS duplication calculator
In a DFS tournament, duplication is how many other entries are likely to hold your exact lineup, and a duplicated lineup splits its prize with everyone who has it. The calculator estimates expected duplicates from each player's ownership and the size of the contest, so you can tell when a lineup is too chalky to win big.
How do I cut duplication?
Swap one high-owned player for a lower-owned one with a similar projection; one change can cut expected duplicates sharply.