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Set 18Tools

Rolldown calculator

Your exact chance to hit, from Riot's shop odds and the shared pool. The address updates as you go, so any spot is a link you can share.

All tools
Chance to hitAny 3 cost1 copyLevel 750 gold

98.5%

ReliableYou find it in about 99 of 100 rolldowns like this.
Chance of at least
1 copy99%
2 copies92%
3 copies76%
4 copies53%
25
Rolls
Yes
Even odds already
18
Copies left in the pool
No gain
Level up first

Copies sitting in other players' shops can lower this a few points in a contested lobby.

Common spots
Player levelSets the shop odds
Unit costChance per shop slot at level 7
Champion18 copies of each 3 cost in the pool
CopiesTwo star takes 3, three star takes 9. 18 left to find.
You hold
0
You need
1
ContestedCopies on other players' boards and benches
0
Gold25 rolls at 2 gold each
050100150200
Other 3 costs gone217 of 252 3 cost copies still in the pool
35
ExperienceToward level 8, bought 4 at a time
0of 60

How this works

Exact, not simulated. Every shop is five slot draws: the cost tier from the level's odds, then the champion drawn from the shared pool without replacement. A dynamic program over every shop you can afford gives the exact chance of at least each copy count.

What it accounts for. Riot's shop odds per level, pool sizes per cost, a shop never showing more copies than exist, copies you hold, contested copies, same cost champions already gone, and unlockable champions that grow their tier's pool.

What it assumes. You buy every copy you see. Other players' shops are not modeled, and the pool does not change while you roll.

Where reality differs. Copies sitting in other players' shops are out of the pool but invisible to you, which can cost a few points in a contested lobby. Model it with Contested and Other champions gone.

15Cost−+Level↑↓Gold, Shift for 10←→Copies