Trade-Up Planner
Ten of one rarity trade up to one random item of the next tier. Enter your inventory to see what you can make.
Trade-up Planner 10 → 1
Enter how many of each rarity you hold. Ten of one tier trade up to one random item of the next tier — the result item is never guaranteed.
Deterministic tier math only: 10 Commons → 1 Uncommon → … so 10,000 Commons cascade into 1 Legendary-tier pull. Which legendary you get is random (12 in the base pool). Mechanic verified from the community item guide; no per-item odds are implied. v0.2
The 10-to-1 rule
Bongo Cat lets you combine 10 items of the same rarity into one random item of the next rarity up. It is a verified mechanic, but the result is random — you choose the tier, not the item.
Because each step is 10-to-1, the tiers chain: 10 Commons make an Uncommon, and 10,000 Commons cascade all the way to a single Legendary-tier pull. The planner above does that deterministic tier math for your inventory.