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Crafting Resource Calculator

Enter the recipe's material cost, quantity and what you already have to plan your gathering.

How it is calculated

The tool scales one recipe up to a batch, adds a safety margin and subtracts your stock: gross = per × qty × (1 + waste ÷ 100) and still needed = gross − have. per is the units of one material that a single item costs, qty is how many items you want, have is what you already own, and waste is an extra percentage on top of the base need. Leave have and waste empty and both count as 0. Per and qty must be present, and no input may be negative. If your stock covers the gross amount, the tool shows 0.00 rather than a negative figure. Two results appear: the amount still to gather and the gross total before stock is subtracted. Waste is added as a percentage, so 20 means 20% extra. It handles one material at a time.

Worked example

A recipe costs 12 units of ore per item and you want 25 items, with 20% extra for losses and 80 units already in the inventory. Base need: 12 × 25 = 300. With waste: 300 × 1.20 = 360, shown as the gross 360.00 units. Subtract the stock: 360 − 80 = 280.00 units still to gather. Without the 20% margin the figure would be 220, and you could run short in the middle of the session.

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Common mistakes

  • Entering a failure chance as the waste. A 20% failure rate means one craft in five is lost, so you need 25% extra, not 20%: waste = fail ÷ (1 − fail) × 100.
  • Putting the total material count in the per-item box. That box is the cost of a single item; the quantity box does the multiplication.
  • Counting materials you are about to spend elsewhere as in inventory. Enter only what is free for this batch.
  • Entering several ingredients at once. Each material has its own per-item cost and stock, so run them one by one.
  • Expecting intermediate components crafted from raw materials to be unpacked; the tool only counts units of the one material you enter.

About this calculator

In crafting-based games, a recipe specifies how much of each material is needed per item produced; scaling that up for a batch and subtracting what's already in inventory gives the actual shopping or gathering list. Adding a wastage or fail-rate factor — common when crafting has a chance to consume materials without producing an item, as in many MMOs — inflates that requirement to account for expected losses. Here the wastage is a percentage added on top of the base need: materials needed = (recipe cost × batch quantity × (1 + wastage ÷ 100)) − current inventory. If you know a true fail rate f, entering f ÷ (1 − f) as the wastage gives the exact expected requirement (a 20% fail rate means entering 25%).

This calculator takes a recipe's per-item material cost, the quantity you want to craft, what you already hold in inventory, and an optional wastage rate, then returns how many more materials to gather, along with the total before inventory is subtracted. MMO and survival-game players use it to plan farming or auction-house runs before committing to a big crafting session, and game economy designers use the same math when balancing recipe costs and drop rates during development.

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