Sell-through rate: check supply before you buy

Sell-through tells you how fast a type of item moves

Two items can sell for the same price. One sells within a week of listing; the other sits for months among dozens of identical listings. Sold prices alone don't show that difference. Sell-through rate does: it compares how many items sold with how many were offered. A high rate means buyers are absorbing supply; a low rate means you'll be waiting.

This guide explains the measure, how to estimate it from marketplace data, and how to use it in buying decisions, with eBay's product research tool as the main source, checked November 8, 2026.

The basic idea

A common way to express sell-through for resellers is:

Sell-through = items sold ÷ (items sold + items still listed), over a chosen period.

Platforms may calculate their own sell-through figure slightly differently, so use one method consistently when comparing items.

Where the numbers come from

eBay's Terapeak product research help page describes a sell-through rate in its results for searches covering items sold 90 days ago or less, alongside the sold price range and the number of sellers. The eBay product research guide walks through using it. On other platforms you can estimate it by counting sold and active listings in search for the same item and condition.

Step 1: Search the exact item

Be specific. "Board game" is meaningless; the exact title, edition and completeness is useful. The research prices manual explains how to narrow a search so the counts mean something.

Step 2: Count sold and active

Use the same period and condition for both. If you can only see active listings, count them and compare with sold results from the last 90 days. In this chosen example, a vintage camera body has 24 sold and 36 active, giving 40%.

Step 3: Translate the rate into waiting time

Sell-through gives a rough sense of how long your copy might wait. With 24 sales in 90 days and 36 active listings, the market is absorbing about eight a month. If you list at a competitive price, you're one of 37 copies, so a rough estimate is several weeks. If you price above the others, it will likely be longer. This is an estimate, not a forecast.

Step 4: Use it in buying decisions

Combine sell-through with margin. A low-sell-through item can still be worth buying if it's very cheap and costs nothing to store. A high-sell-through item with a thin margin may still be a poor use of time. The cash flow vs margin guide shows how speed and margin interact.

Step 5: Use it for your own stock too

Your own sell-through matters as much as the market's. Count how many items you sold this month against how many were listed:

• Sold 30 of 150 listed items this month: 20% monthly sell-through.
• At that pace, the average item waits about five months.

If your own rate drops while you keep buying, stock builds up. The stale inventory manual explains when to pause buying and cut prices.

Step 6: Watch for distortions

Sell-through can mislead when:

• Many listings are duplicates from one seller.
• Sold counts include items in better condition or with extras.
• A recent spike, such as a movie release, briefly lifted sales.
• The search was too broad and mixed different items.

The sold comps manual covers similar pitfalls in price research.

The mini calculator

The calculator on this page compares a cost per item across the whole lot with the cost per item you can actually sell. Use it when sell-through suggests only part of a lot will move.

Common mistakes

• Treating sold price as the whole story without checking how many are unsold.
• Comparing sell-through from different periods or conditions.
• Searching too broadly and mixing different items.
• Ignoring your own shop's sell-through while buying more stock.
• Treating the estimate as a guarantee.

Supply matters as much as price

Sell-through shows whether buyers are keeping up with sellers; check it before you buy, not after. A high rate means you'll wait less, and a low rate means you need to buy cheaper.