Tools
Free inventory management tools and calculators
Interactive calculators and generators that help you manage inventory smarter — reorder points, EOQ, safety stock, turnover, COGS, markup vs margin, and bulk barcodes. Free, and no signup required.
Free forever for 100 items · no credit card
Replenishment & planning calculators
Size your orders and buffers with the same formulas the guides walk through.
Reorder point calculator
Find when to reorder based on lead time, daily demand, and safety stock.
Safety stock calculator
Size your buffer against demand spikes and late deliveries — and see the reorder point it implies.
EOQ calculator
Find the order quantity that minimizes combined ordering and holding costs.
Inventory turnover calculator
Calculate turnover ratio and days-to-sell from COGS and average inventory.
Cost, pricing & labeling tools
Work out margins and print scannable labels without a spreadsheet.
COGS calculator
Calculate cost of goods sold, gross profit, and gross margin for any period.
Markup & margin calculator
Convert between markup and margin, or find a selling price from cost.
Barcode generator
Generate Code 128 barcodes and QR codes in bulk — print label sheets or download PNGs, free.
Label generator
Lay out name, SKU, and a barcode or QR on a printable label sheet, then print on Avery-style sheets — free, no signup.
Frequently asked questions
Are these inventory tools free?
Yes. Every calculator and the barcode generator run in your browser and are completely free — no signup, no email, no limits.
Do I need an account to use the calculators?
No. All the tools work without an account. You only need a StockZip account if you want to turn the results into live inventory tracking, low-stock alerts, and printed labels.
Which calculator should I use to avoid stockouts?
Start with the reorder point calculator to find your order trigger, then the safety stock calculator to size the buffer that protects against demand spikes and late deliveries. The EOQ calculator then tells you how much to order each time.
Can I print barcodes for my inventory?
Yes. The barcode generator creates Code 128 barcodes and QR codes in bulk that you can arrange onto label sheets and print, or download as PNGs. Inside StockZip you can print labels tied directly to your item records.
Want all these calculations automated?
StockZip calculates reorder points, tracks stock levels, and alerts you when it is time to order. Start free — your signup price is your renewal price.
Free for 100 items
No credit card