Stock Turn Calculator
Turnover by units or by retail value.
Stock turn
6.0×
61 days of inventory
How the Stock Turn Calculator works
Stock turn is the same idea as inventory turnover, measured the way retail buyers usually think — in units or at retail value rather than at cost. The number differs from cost-based turnover, and mixing the two is what makes benchmarks confusing.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
How does stock turn differ from inventory turnover?
Only in the basis. Inventory turnover conventionally uses cost of goods sold over average inventory at cost. Stock turn is often calculated on units or on retail value. The concept is identical; the number is not, so state which you are using.
Should I use units or value?
Units for a single product or a uniform category — it is unambiguous. Value across a mixed catalogue, since you cannot meaningfully add a £5 item to a £500 one. Retail value flatters the ratio compared to cost, so be consistent.
What does low stock turn tell me?
Either you are carrying too much, or the product is not selling. Look at sell-through rate and weeks of supply to tell which — a slow product with lean stock is a demand problem; a good product with excessive stock is a buying problem.
How often should I measure it?
Monthly at category level, quarterly at product level. Measured too frequently the numbers are noisy; measured annually you find out about a problem long after it could have been fixed cheaply.