What is Sell-Through Rate?

Every time you buy stock, you are making a bet on how fast it will sell. Sell-through rate is how you check that bet. It compares what you sold with what you received, product by product, so you can see which buys are working and which are going to sit on the shelf.

It is the quickest inventory metric to read and the easiest to act on. It tells you when to reorder, when to promote or mark down, and when to stop buying a product altogether.

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What Is Sell-Through Rate?

Sell-through rate is units sold divided by units received over a period, shown as a percentage. Some stores divide by units available instead - stock on hand at the start of the period plus anything received during it - which works better for products you have carried for a long time.

Where inventory turnover looks at the whole store's stock in money terms, sell-through looks at units of a specific product or collection against what you bought. That makes it the natural metric for judging a new product, a seasonal drop or a single purchase order.

🧒 Explained simply You bake 50 cookies to sell at your lemonade stand. By the end of the day you have sold 40. Your sell-through is 80%. If you only sold 10, you'd know to bake fewer next time - or put up a "cookie deal" sign before they go stale.

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How to Calculate Sell-Through Rate

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

Say a store has, for a new jacket in its first 60 days (illustrative round numbers):

• Units received: 400
• Units sold in the first 60 days: 260

Sell-through rate = 260 ÷ 400 × 100 = 65% at 60 days

Using units available instead: if the store already had 100 of the same jacket from last season, units available would be 500, and sell-through would be 260 ÷ 500 × 100 = 52%.

Things to settle before comparing products:

• Use a fixed window after stock arrives. Measure at, for example, 30 or 60 days after receiving. A product that arrived last week can't be fairly compared with one that has been on sale all month.
• Count net units. Units that were returned and put back into stock haven't really sold. Subtract returned units, or at least check returns for products with high sell-through.
• Keep it per SKU where it matters. A jacket with 65% sell-through overall might be sold out in medium and barely touched in extra large.

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Why Sell-Through Rate Matters

It is the earliest reliable signal about a product. Low sell-through in the first few weeks of a season is the signal to promote or mark down while there is still time to sell at a decent price, not after the stock has aged.

It drives buying decisions. High sell-through tells you to reorder, and early; low sell-through tells you to buy less next time or stop carrying the product. Over a few seasons, buying from sell-through data rather than instinct keeps more cash out of slow stock.

And it shows where sizes and variants are off. Products often sell out in the middle of the size range and linger at the edges. Sell-through by SKU tells you how to split the next order.

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What Is a Good Sell-Through Rate?

It depends on product lifecycle and season. A seasonal fashion line needs to sell through quickly before it goes out of style, while a staple you restock all year can run at a steadier pace. A single target for the whole store doesn't work.

Set targets per collection instead, and compare similar products launched at similar times - this autumn's new arrivals against last autumn's, measured over the same window after arrival.

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How to Improve Sell-Through Rate

1. Check it early and act early

Look at sell-through at fixed points after stock arrives - say two, four and eight weeks. Products running well behind similar launches need attention while they are still current.

2. Promote before you mark down

Give slow products better placement: homepage features, email, bundles with best-sellers or a spot in "complete the look" sections. Markdowns are the last step, not the first.

3. Mark down in planned steps

When you do need to discount, set the steps in advance - a modest first markdown, then a deeper one if sell-through still lags. Planned markdowns protect more margin than a panic sale at the end of the season.

4. Buy smaller, then reorder

For new and untested products, start with a smaller order and reorder based on early sell-through. It costs a little more per unit but avoids being stuck with a large buy that doesn't sell.

5. Fix the size and variant split

Use sell-through by SKU from past seasons to decide how many of each size or colour to buy. Shift units from variants that linger to the ones that sell out.

6. Improve the product page for slow sellers

Sometimes a product isn't selling because of how it is shown. Better photos, clearer descriptions and visible reviews can lift sell-through without touching the price.

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How to Track Sell-Through Rate

Chartsy for Ecommerce connects to your BigCommerce store with read-only access and syncs orders, products and customers every hour. It reports units sold by product, SKU and month from your orders. Units received come from your purchasing or inventory records - combine the two to get sell-through per product or collection.

Order-based views worth checking:

• "Show units sold by SKU for the last 60 days"
• "Which products sold the most units this month?"
• "Show units sold by product by month this year"

Try Chartsy for Ecommerce free for 14 days →

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