What this calculator tells you

Inventory turnover shows how efficiently stock is moving through the business. Slow turnover ties up cash, while very fast turnover can indicate a stockout risk.

Average inventory = (beginning inventory + ending inventory) / 2. Turnover = COGS / average inventory. Days of inventory = 365 / turnover.

When to use it

Use it for a monthly or quarterly check on slow-moving SKUs and the cash tied up in stock.

Use conservative inputs

Start with your landed cost, real fee rates, and a pessimistic advertising cost. The result is more useful when the assumptions are honest.

Watch the common mistake

Looking only at unit counts can hide the fact that expensive inventory is moving much more slowly than cheap inventory.

Frequently asked questions

Should I use cost or retail value?

Use cost of goods sold and inventory at cost for a consistent turnover calculation.

What if turnover is low?

Low turnover may mean excess stock, weak demand, or a product assortment problem. Review the SKU and aging stock together.

Is higher turnover always better?

Not necessarily. Extremely high turnover can mean you are understocked and losing sales.

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