A 30 % Sell-Through Is Excellent or Alarming, and the Missing Word Is "When"
Published 9/22/2026 · 3 min read · Business tools
Sell-through is units sold divided by units received, and it is one of the few retail figures that is genuinely simple: 120 out of 400 is 30 %. What it hides is time. Thirty per cent in the first week of a six-week season is a product that will sell out before the end and probably should have been ordered deeper. Thirty per cent after five of those six weeks is a product that will be marked down, and the mark-down will take back more margin than the sale ever made. The number is identical and the two situations require opposite decisions. Always quote the rate with the elapsed share of the season beside it — the comparison between the two is the actual measurement, and the rate on its own is only half of it.
120 units sold out of 400 received is 30 %. Whether that is a success depends entirely on how long it took, and the rate on its own does not carry the answer.
Received, not ordered
The denominator is what actually arrived, and using the order quantity instead flatters every supplier who under-delivers. A line ordered at 400 and delivered at 320 that sold 120 has a sell-through of 37.5 %, not 30 % — and the difference is the supplier's failure, not the product's success. Keeping the denominator honest is also what makes the figure comparable between lines, since short deliveries are rarely spread evenly across a range.
It is not the same as inventory turnover
Sell-through measures one delivery against itself and answers whether that buy was the right size. Turnover measures a whole period's cost of sales against average stock and answers how hard the capital is working across the business. A shop can have excellent turnover and a catalogue full of lines that never sell through, because the fast movers carry the average — which is exactly the pattern that fills a stockroom with slow-moving depth nobody noticed buying.
| Elapsed | Reading | Decision |
|---|---|---|
| 1 week of 6 | ahead of the curve | reorder, protect the size run |
| 5 weeks of 6 | behind the curve | mark down now, not later |
Worked with our own calculator
Sell-through rate calculator
Given
- Units sold
- 60
- Units received
- 100
Result
- Sell-through rate
- 60%
These figures are produced by the calculator below, not typed in by hand — they are recomputed whenever the tool changes.
Run it on your own figures →Frequently asked questions
- What is a good sell-through rate?
- There is no universal figure, and any number quoted without a period attached is marketing rather than measurement. What is usable is your own curve: track the rate weekly for a season, and the shape it traces becomes the benchmark for the next one. A line running above its own historical curve at the same point of the season is the signal worth acting on — not a threshold borrowed from another retailer with different margins and a different clearance policy.
- Should returns be subtracted from units sold?
- Yes, and in a category with a high return rate it changes the picture entirely. A clothing line showing 30 % sell-through with a third of it coming back is really at 20 %, and the returned units are back in stock competing with the ones that never left. Subtract returns from the numerator and add them back to available stock — the alternative is a figure that says the buy was fine while the stockroom says otherwise.
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