How is the cost per item calculated?

For each material the per-item cost is price times quantity. Summing every material gives the cost to craft one finished item. Multiplying by your batch size gives the total cost.

What is GP per XP and why does it matter?

GP per XP is the net cost (or profit) of one craft divided by the XP it gives. It lets you compare training methods fairly — a method might be cheap per item but slow XP, so the GP-per-XP figure shows the true price of levelling.

Does this include the Grand Exchange tax?

Not automatically. OSRS charges a 1% sell tax (capped per item) on the Grand Exchange. If you want a precise profit figure, reduce the sell price you enter by about 1% to account for the tax.

Can profit be negative?

Yes. Many crafting methods cost GP to train rather than make money — the profit field shows a negative number when materials cost more than the finished item sells for. That negative is your training cost.

How do I handle multi-step recipes?

Cost out each intermediate as its own item first, then enter that intermediate's cost as a material price in the final recipe. The calculator handles any number of material rows so you can chain sub-components in.

Old School RuneScape Crafting Material Cost Calculator

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The Old School RuneScape Crafting Material Cost Calculator lets you price a craft before committing your bank. Add each material with its Grand Exchange price and quantity, choose a batch size, and the tool returns cost per item, total cost, profit versus the finished item’s sell price, and GP per XP for the method.

How it works

Cost is a simple weighted sum. For each material row:

materialCost = price * quantityPerItem
costPerItem  = sum of all materialCost rows
totalCost    = costPerItem * batchSize

If you supply a sell price and XP per craft, the tool also computes:

profitPerItem = sellPrice - costPerItem
totalProfit   = profitPerItem * batchSize
gpPerXp       = profitPerItem / xpPerCraft   (negative = training cost)

Tips

Account for the 1% Grand Exchange sell tax by trimming the sell price you enter by roughly 1% — this keeps profit estimates realistic.
For multi-step recipes (e.g. cut gems then craft jewellery), price the intermediate first and feed its cost in as a material in the next stage.
A negative GP-per-XP simply means the method costs money to train; compare those figures across methods to find the cheapest XP for your budget.