Sell-through rate

Sell-through rate is the percentage of an inventory batch that's been sold within a defined window. It's the metric that answers: "of what we bought, how much actually sold?"

It's the buyer's report card. A sell-through rate of 70% in 8 weeks on a launch means most of the stock moved on plan. A sell-through rate of 30% in the same window means the buy was wrong, or the marketing was wrong, or both.

The formula

Sell-Through Rate = Units sold / Units received × 100

Calculated over a defined window — typically the launch period, the season, or a rolling 4-, 8-, or 13-week window for ongoing SKUs.

Worked example. A fashion brand receives 1,000 units of a new style. After 8 weeks, 650 have sold.

Sell-through rate = 650 / 1,000 = 65%

Compared against the brand's 8-week sell-through target of 60%, this style is performing slightly above expectation.

Why it's the dominant metric in fashion and FMCG

Sell-through is the language of buying decisions in any category where stock comes in batches and the next decision depends on how the last batch performed:

• Fashion / apparel. Each season is a batch. Sell-through at week 4, week 8, and end-of-season drives reorder, markdown, and next-season buying.
• FMCG / consumer goods. Each PO is a batch. Sell-through within the PO's intended sell-through window drives the next reorder size.
• Retail buying. Whether a SKU "earned" its replenishment depends on sell-through against the buyer's plan.

In subscription or perpetual-availability businesses, sell-through is less central — days of cover and inventory turnover take its place.

Benchmarks by category

Healthy sell-through rates vary enormously:

• Fast fashion (4-week window): 60–80%
• Standard fashion (8-week window): 60–75%; full-season target 80–90%
• FMCG ongoing replenishment (4-week window): 70–85%
• Beauty new product launch (8-week window): 50–70%
• Furniture / homeware (12-week window): 30–50%
• Long-lifecycle goods: targets are lower; the clock is longer

A high sell-through rate isn't always good. 100% sell-through in week 1 means you under-bought and you've been stocked out for the rest of the window. A sell-through curve that hits 70% in week 4 and then plateaus at 75% is also a problem — the early movers are gone and the residual stock is the slow movers, headed for markdown.

The sell-through curve

More information than the headline number: how sell-through accumulates over the window. A healthy curve rises steadily through the period. Patterns to watch:

• Front-loaded curve (60% in week 1, then flat) → strong launch, but the residual is dead-weight
• Linear curve → on plan, predictable
• Back-loaded curve (10% in week 1, 60% in week 8) → slow start, often a marketing or merchandising issue rather than a buying issue
• Plateauing curve → demand has flattened; markdown likely needed to move the rest

The curve shape diagnoses why the sell-through landed where it did.

Sell-through and the buying cycle

Sell-through drives three downstream decisions:

• Reorder. Above-target sell-through earns a reorder, often at the same or larger quantity. Below-target sell-through means no reorder.
• Markdown. Sell-through behind plan partway through the window triggers markdown to clear the rest.
• Range. Persistent low sell-through across SKUs in a sub-category is a range signal — the brand might be over-ranged or in the wrong assortment.

The sell-through report is usually reviewed weekly during launch periods and monthly thereafter.

Common pitfalls

• Comparing sell-through across windows of different lengths. 60% in 4 weeks is much stronger than 60% in 12 weeks. Always include the window when reporting.
• Using sell-through to judge ongoing replenishment SKUs. For perpetually-available items, weeks of supply or inventory turnover is the better metric.
• Aggregating sell-through across channels. A 70% sell-through where 50% came from D2C and 20% from wholesale tells a different story than 35% / 35%. Channel-level sell-through reveals where the demand actually came from.

Sell-through vs inventory turnover

Both measure stock movement; different framings:

• Sell-through rate = % of a batch sold in a window. Best for batch-oriented buying.
• Inventory turnover = how many times average inventory turns over in a year. Best for ongoing-flow operations.

Fashion uses sell-through. FMCG uses both. Subscription uses turnover.