This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Roblox Is Unbreakable session. It will not click the shop.
Drop probability
Arrow success chance
Estimate the chance that at least one Arrow or Requiem Arrow succeeds when you already know the percentage printed in game.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
Type the percentage the game shows when you click the Arrow. A level 25 account is documented around 50 percent on a normal Arrow, and a Requiem Arrow uses your level as the percentage. The result is the chance that at least one independent roll succeeds. It does not read your account, and a failed normal Arrow is still consumed.
Material planner
Gold Ingot shortfall
Count the Gold Ingots still missing for Pure Arrow or Requiem Arrow crafts.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
A Pure Arrow schematic uses 5 Gold Ingots. A Requiem Arrow schematic uses 3. Change the per-craft number to match the recipe. Cash, Meteorite Shards, Wood and the schematic itself are not included.