Inventory Turnover

Inventory turnover counts how many times a company sells through and replaces its stock during a period, calculated as cost of goods sold divided by average inventory. A higher number means product moves quickly and capital spends little time sitting on shelves; a lower number means cash is parked in warehouses.

The math

With $300M of annual cost of goods sold and $60M of average inventory, a retailer turns its stock 5 times a year, holding each item about 73 days. Let demand soften while purchasing stays on autopilot: inventory swells to $100M and turnover drops to 3x.

	Healthy	After the slowdown
Cost of goods sold	$300M	$300M
Average inventory	$60M	$100M
Inventory turnover	5x	3x

The balance sheet now holds $40M of extra cash trapped in product, and stale goods rarely sell at full price. Clearing the excess at a 25% markdown burns $10M of gross profit, roughly a quarter’s earnings for a chain netting $40M a year, and the cash stays stuck until the discounting is done.

The trap

Rising inventory is routinely explained away as “building ahead of demand,” and sometimes that is true. The expensive mistake is accepting the phrase without checking the sales line: inventory growing faster than revenue for consecutive quarters usually precedes a margin reset, because the only exits are markdowns or write-offs.

Sector blindness compounds the error, since a turnover of 4x is alarming for a grocer and excellent for a jeweler, and screens that ignore the difference produce nonsense.

The move

Chart inventory growth against revenue growth every quarter; divergence is the earliest signal most retail and hardware blowups offer. Compare turnover only within an industry, and read the inventory footnote for the mix of raw materials, work in progress, and finished goods, because a buildup of finished goods is the dangerous kind.

Pair the ratio with gross margin: falling turnover plus falling margin means the markdowns have already begun.