These calculators cover the recurring inventory math teams end up doing in a spreadsheet: when to reorder, how much buffer stock to hold, which SKUs deserve the tightest control, and what a bill of materials actually costs to build.
Each one shows the underlying formula, not just a result, so you can adapt it to your own numbers or sanity-check what another tool gave you.
If a calculator here answers "what should this number be," the matching glossary entry explains the concept behind it in more depth start with the term, then come back to run your own numbers.
Calculators
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Reorder point & EOQ calculator
Enter average and peak usage plus supplier lead time to get a reorder point, safety stock buffer, and economic order quantity.
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Safety stock calculator
Size the buffer stock you need to absorb demand spikes and late deliveries without overstocking every SKU by the same amount.
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ABC analysis tool
Paste your SKU list and usage values to split inventory into A/B/C tiers by value contribution.
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Inventory turnover calculator
Turn cost of goods sold and average inventory value into a turnover ratio and days-to-sell figure.
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Carrying cost calculator
Estimate what it actually costs to hold a unit in stock for a year capital, storage, insurance, and shrinkage combined.
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BOM cost calculator
Roll up component costs and a scrap allowance into a finished-good material cost for a multi-level bill of materials.
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EOQ calculator
Find the order size that minimizes combined ordering and carrying cost for one SKU.
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GMROI calculator
See how much gross profit a dollar tied up in inventory is actually generating.
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Days sales of inventory (DSI) calculator
Find how many days, on average, it takes to sell through your inventory.
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Landed cost calculator
Find the true per-unit cost of a purchased item once freight, duties, and fees are added.
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Inventory shrinkage calculator
Compare recorded stock value to a physical count to find your shrinkage rate.
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Stockout cost calculator
Put a rough dollar figure on a stockout, to weigh against the cost of more safety stock.
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Barcode generator
Generate a scannable Code 128, EAN-13, UPC-A, or Code 39 barcode and download it as a PNG.
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QR code generator
Generate a QR code for a SKU, product URL, or asset ID and download it as a PNG.
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