Inventory tools
Stock decisions, worked out exactly.
Five free tools for the questions that come up constantly when you carry physical stock: what to call it, how to mark it, when to reorder it, how much to order, and how fast it's actually moving. No account, no upload — everything runs in your own browser.
Reviewed 2026-08-11
SKU generator
Build clean, unambiguous SKU codes from category, brand, size and color segments plus a padded sequence — bulk-generate and export to CSV.
Barcode generator
Code 128, Code 39, EAN-13, EAN-8 and UPC-A, with check digits validated or computed — never a made-up GS1 number.
Reorder point calculator
Find the stock level that should trigger your next order, from usage, lead time and a safety buffer you enter directly or derive.
Economic order quantity calculator
Find the order size that minimizes ordering and holding cost together, with the model's assumptions stated plainly.
Inventory turnover calculator
See how many times a year your stock turns over and how many days a typical unit sits, with an optional target comparison.
Reorder point and EOQ answer different questions
It's easy to reach for one when you mean the other, because both come out of the same stock-planning problem. Reorder point answers when: the exact stock level, watched continuously, that should trigger your next purchase order. It's built from how fast you use stock and how long a new order takes to arrive, plus a buffer for when either one runs worse than average.
Economic Order Quantity answers a completely different question — how much to order once you've decided to place an order at all. It balances the cost of placing an order (which favors ordering rarely, in bulk) against the cost of holding stock (which favors ordering often, in small amounts), and finds the quantity where those two costs are lowest combined.
Run together, they tell the full story: reorder point tells your system when to fire a purchase order, and EOQ tells it how many units to put on that order. Neither one substitutes for the other, and a system using only one is only half planned.