eBay Sell-Through Rate: How to Check Demand Before You Buy

Look at the item that has been sitting in your inventory the longest. There is a decent chance the sold comps were fine when you bought it. The price was real, the profit math worked, and it still has not sold. Price was never the missing piece. Nobody told you how often that item actually moves.

That is what sell-through rate measures, and it is the second number you should be pulling before you spend money.

What sell-through rate actually is

Sell-through rate is the share of listings for an item that end in a sale instead of sitting there. You get it by dividing the number that sold by the total number on the market.

The version you can run in about thirty seconds looks like this:

sold listings, divided by sold plus active listings, times 100

Search your exact item on eBay and write down how many active results come back. Then tick the Sold filter and write down that count. Those two numbers give you the percentage. eBay's sold filter covers the last 90 days, so what you are really measuring is how much of the available supply cleared in about three months.

Sold comps answer a different question. They tell you what the item is worth. Sell-through tells you whether it will sell at all, and roughly how long you will be waiting. Both matter. Only one of them is on the price tag.

Reading the number

Here is how we treat the result. These are our own working thresholds, not published eBay figures, but they have held up across a few hundred items.

Sell-through	What it means	What we do
Under 20 percent	Weak demand or heavy supply	Pass unless the buy is nearly free
20 to 50 percent	Normal for used clothing and general goods	Buy if the profit math works
50 to 80 percent	Real demand, thin competition	Buy, and buy more of it when you see it
Over 80 percent	Hot or scarce	Buy, price at the top of the band

Notice that a low sell-through is not automatically a no. It is a cost-of-time number. An item at 15 percent might still be worth a dollar. At twenty dollars it ties up your money for a season. The rate changes what you are willing to pay, not just whether you buy.

Run it on the specific thing, not the category

This is where most people get a useless answer. Search "Nike polo" and you get thousands of results that have nothing to do with the shirt in your hand. The rate you calculate is meaningless because the supply you counted is not competing with you.

Search the way a buyer would search for your exact item. Brand, item type, and the one or two details that narrow it, usually size or team or model. Then read the count.

If your search returns fewer than about ten sold results, do not calculate a percentage at all. The sample is too small for the math to mean anything. Fall back to the simpler question. Have several of these sold recently, and at what price. That is a fine answer for a one-off item, which is most of what a reseller handles.

Where to get the real number

The manual count is quick, and it is what you use standing in a store. When you are deciding what category to chase, use Terapeak Product Research instead. It is free inside Seller Hub for every seller, and it reaches back well past the 90-day window that regular search cuts off. That matters for anything seasonal or slow moving, where three months of data will lie to you.

There is a second version of this number that belongs to you, not to the market. Your own sell-through is the share of what you list that sells. It lives in your Seller Hub traffic report. Watch it across 30 and 90-day windows rather than day to day. If your own rate is falling while your listings and photos have not changed, the problem is upstream of your listings. You are buying the wrong things.

Three ways the number lies

Season. Check a winter coat in June and the rate will tell you to pass. Check football jerseys in July and it looks flat right up until it does not. When the item is seasonal, note the season you are in and adjust, or look at a longer window in Terapeak.

Dead active listings. Some of the active listings you counted are priced far above the market and have been sitting for a year. They inflate the denominator and drag your rate down. If the active results are full of prices that never appear in the sold results, your true rate is better than the math says.

One-of-one items. Vintage, odd sizes, and unusual pieces will almost never produce a clean rate. Supply is one, which is you. Judge those on sold prices and on how recent the sales are.

The takeaway

Sold comps tell you the price. Sell-through tells you the wait. Pull both before the item goes in your cart, and let a slow rate push the price you are willing to pay down rather than talking yourself into it because the ceiling looks good.

The full sourcing system, including the numbers we track per category and how we decide what to repeat, is what we teach inside The Income Lab.

Photo credit: Shixart1985, via Wikimedia Commons, CC BY 2.0.