Inventory turnover is the clearest read on whether a brand's cash is working or sitting on a rail. It counts how many times you sell through and replace your stock in a period, and in fashion, where every season expires, that speed is the line between healthy margin and a markdown pile.
It is one of the core metrics of retail math, and this guide takes it further than the generic definition: how to calculate it, what a good ratio looks like by fashion category, and why the number behaves differently for apparel than for the rest of retail.
What is inventory turnover?
Inventory turnover (also called the inventory turnover ratio or stock turn) is the number of times a business sells and replaces its inventory over a set period, usually a year. A higher number means stock is moving quickly; a lower number means it is sitting.
It matters because inventory is cash. Stock that turns fast frees up money to reinvest and limits the holding, obsolescence, and markdown costs that pile up the longer a garment stays unsold.
How to calculate inventory turnover
Formula: inventory turnover = cost of goods sold (COGS) / average inventory. Example: $600,000 in COGS on $120,000 of average inventory turns 5 times a year. Average inventory: take the beginning and ending inventory for the period and divide by two, both at cost, so they match COGS.
Keep the two sides consistent. COGS is a cost figure, so average inventory must be at cost too, not at retail value, or the ratio is meaningless. Some teams use net sales instead of COGS, which inflates the number and makes it non-comparable, so pick one basis and hold it.
Match the period to the decision, too. An annual turnover is fine for a year-on-year health check, but fashion planners also read it by season or even by month, because that is where the markdown and reorder calls actually happen.
Inventory turnover vs days of inventory
Formula: days of inventory (or days sales of inventory) = 365 / inventory turnover. Example: a turnover of 5 is 365 / 5 = 73 days of inventory, meaning stock takes about ten weeks to sell through on average.
They are the same fact in two units. Turnover is easier to benchmark; days of inventory is easier to act on, because it maps straight onto how many weeks of a season a given stock level will cover.
What is a good inventory turnover in fashion?
There is no universal target; a good ratio depends on category, price point, and business model. Across retail, many businesses treat a turnover of 5 to 10 as healthy, but apparel sits lower and splits sharply inside itself.
- Apparel and fashion overall: typically about 4 to 6 times a year, though published benchmarks vary widely and public-company figures often run lower.
- Fast fashion: much higher, often 8 to 12 or more, driven by rapid new drops and deliberately lean stock.
- Core basics and replenishment: can run higher than fashion lines, since they sell steadily and restock rather than expire.
- Accessories and jewelry: lower, often around 2 to 3, where higher margins tolerate slower movement.
The honest caveat: sources disagree on the exact numbers, and a company's real turnover depends on how it accounts for cost and season. Benchmark against your own history and your direct category, not a single headline figure.
Public-company apparel figures often come in lower than the tidy benchmarks, because real accounting, seasonality, and off-price channels drag the number around. Treat any single figure as a starting point, and trust the trend in your own data more than the headline.
How turnover connects to the other metrics
Inventory turnover is rarely read alone. It is the same story that sell-through, weeks of supply, and dead stock tell from different angles, and reading them together is where the decisions get made.
Say a jacket line was planned to turn 5 times, but six weeks in its weeks of supply are climbing and sell-through is tracking below plan. Turnover is already slipping toward 3, the early signature of dead stock forming. The single ratio flags the problem; the others tell you where and how to fix it, by reallocating, remarking, or cutting the reorder.
That is the practical value of turnover: it is the fastest single number to spot a problem, and the trigger to go look at the metrics that explain it.
Why inventory turnover matters in fashion
The formula is universal, but three things make it sharper in fashion than anywhere else.
- Stock expires: a slow turn on seasonal product does not wait for demand to recover; it becomes a markdown, so low turnover converts directly into lost margin.
- It signals dead stock: a turnover falling well below the category norm is an early warning that inventory is becoming dead stock, the unsellable surplus that ties up cash and floor space.
- It frees or traps cash: every extra turn releases working capital to reinvest in what is selling, which is why fast turnover and healthy sell-through tend to move together.
How to improve inventory turnover
A low ratio is rarely fixed by ordering less across the board. The levers, roughly in order:
- Buy closer to demand: tighter, better-targeted buys lift turnover more than any in-season tactic, because the ratio is mostly set the day you place the order.
- Chase winners, cut losers: reallocate and replenish into styles that are selling and stop feeding the ones that are not.
- Time markdowns deliberately: clear slow stock on a planned curve before it ages into dead stock, protecting full-price sales where you can.
- Shorten lead times: faster replenishment lets you hold less stock for the same service level, which lifts the ratio directly and cuts the cash tied up on the way.
- Cut the tail: fewer, deeper options turn faster than a long tail of lookalike styles each bought too thin, because depth sells through where fragmentation stalls.
Common inventory turnover mistakes
- Comparing across categories or industries: a grocer turns 15 times and a jeweler twice; only same-category, same-model comparisons mean anything.
- Mixing cost and retail values: dividing a cost figure by inventory valued at retail, or COGS by a sales-based number, breaks the ratio.
- Ignoring seasonality: a single annual number hides the intra-season swings where the markdown decisions actually happen; read it by season too.
- Chasing turnover into stockouts: pushing the ratio ever higher eventually means empty racks and lost sales, not efficiency.
- Setting one target for the whole range: core basics and fashion drops cannot share a turnover goal; hold each category to its own norm, not a blended average.
From turnover to the next buy
Inventory turnover tells you how fast the last buy moved. It is essential and entirely backward-looking; it cannot tell you what to buy next so that the stock turns in the first place.
That is a demand question. Apshan builds the signal layer above the metric, a connected, sourced read on fashion demand, so the next buy is pointed at what will actually sell through. See how it feeds merchandise planning and the wider retail math, or request access and see the plans and pricing.