This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Dueling Grounds ⚔️ session. It will not click the shop.
Material planner
Coin gap
Estimate how many more Coins you need for a weapon or skin whose price you type. A negative result means the Coins you entered already cover that example.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
The form subtracts the Coins you type from per-unit price times count. The default per-unit price is the published Naginata price of 1,650 Coins. It does not read a Roblox account. Type the price shown in your Weapons menu for Warhammer, Curved Swords, or Bo Staff, because those prices disagree across 2026 write-ups. Five priced weapons total 9,800 Coins only if Warhammer is 2,500 Coins and Early Access weapons are left out. The Katana is free, so it adds nothing to that total.