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Sell-Through Rate Calculator: Measure Inventory Velocity

Enter what you received and what you sold to get your sell-through rate, units remaining and estimated days to sell out, instantly and free.

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Sell-through rate
60%
Units remaining
80
Est. days to sell out
20

At a 60% sell-through rate over 30 days, this product is moving at a healthy pace.

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Sell-through rate is the share of inventory you sold in a period compared to what you received. It is one of the cleanest signals of how fast a product moves and whether you ordered the right amount. The formula is simple: units sold divided by units received, times 100. The calculator above runs that math instantly and adds units remaining plus an estimated time to sell out at your current pace.

How to calculate sell-through rate

The formula is units sold divided by units received, multiplied by 100. Say you received 200 units of a product at the start of the month and sold 120 of them by month end. Divide 120 by 200 to get 0.6, then multiply by 100 for a 60% sell-through rate. The 80 units left over are your remaining inventory, and at 4 units sold per day you have roughly 20 days of stock before you sell out.

One detail trips people up: use beginning inventory for the period, not your current on-hand count. Sell-through measures what you moved against what you started with, so if you received more stock mid-period, track it as a fresh cycle. Measuring the same window you receive and replenish on keeps the number honest and comparable month to month.

What is a good sell-through rate?

A good rate varies by category, so treat any single benchmark with care. Many retailers use roughly 80% in a period as a strong target, but fast-moving consumables and seasonal promotions can run far higher, while durable goods, furniture and high-ticket items often sit lower and still perform well. The useful question is not whether you hit one number, but whether the rate is climbing, holding or slipping against your own history.

Read the extremes for what they signal. A very low rate usually points to overstock or weak demand, which ties up cash and risks markdowns later. A very high rate near total clearance can mean you understocked and left sales on the table, since shoppers who found an out-of-stock product simply bought elsewhere. The sweet spot is selling most of your inventory while still meeting demand.

How to improve sell-through

Three levers move sell-through. First, pricing: targeted promotions, bundles and markdowns clear slow stock without training shoppers to wait for discounts on everything. Second, demand forecasting: ordering quantities that match real demand keeps you from drowning in overstock or running dry. Third, and the one most retailers underuse, is driving more qualified traffic to the product itself.

That last lever is where SEO earns its keep. Ranking your product and category pages for the terms shoppers actually search pulls in steady, intent-rich demand that compounds without paying per click. More of the right visitors landing on a page lifts its sell-through directly. For a plan built on your real rankings and competitors rather than guesswork, request a free SEO audit and we will map the demand your store is missing.

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FAQ

Sell-Through Rate Calculator: questions, answered

What is sell-through rate?
Sell-through rate is the percentage of inventory you sold in a period compared to the amount you received. The formula is units sold divided by units received, times 100. If you received 200 units and sold 120 in a month, your sell-through rate is 60%. It tells you how fast a product is moving relative to what you stocked.
How do you calculate sell-through rate?
Divide the units sold by the units received at the start of the period, then multiply by 100. For example, 120 units sold divided by 200 units received equals 0.6, which is a 60% sell-through rate over the period. Always use beginning inventory for the period, not your current on-hand count.
What is a good sell-through rate?
It varies by category, but many retailers treat around 80% in a given period as strong. A very low rate can signal overstock or weak demand, while a very high rate may mean you understocked and left sales on the table. Fast-moving consumables run higher, while big-ticket or seasonal items often run lower and still perform well.
What period should I use for sell-through rate?
Most retailers measure sell-through over a week or a month, and the calculator defaults to 30 days. Use the same window you receive and replenish inventory on so the rate maps to a real buying cycle. Shorter periods are useful for fast fashion and promotions, longer ones for durable goods.
How can I improve a low sell-through rate?
Move slow stock with smarter pricing and promotions, sharpen demand forecasting so you order the right quantities, and drive more qualified traffic to the product. SEO is one of the most durable traffic levers: ranking the product and category pages for what shoppers actually search pulls in steady demand without paying per click.

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