How to Find Profitable Products to Sell on eBay (Without Guessing)

You're standing in a charity shop. There's a North Face fleece on the rail — barely worn, £12 on the tag. It looks right. The brand is strong, the condition is good. Your gut says yes.

But your gut has been wrong before. You've got a box at home with £200 worth of stock that hasn't sold in four months. That box was also a gut feeling.

The difference between sellers who consistently profit and those who don't isn't luck or a better eye for products. It's having a process — one that tells you, with real data, whether a product is worth buying before you hand over the money. Here's that process.

What makes an eBay product profitable

Three things determine whether a product is worth buying for resale:

• Demand — are people actually buying it, or just listing it?
• Competition — how many other sellers are in that market, and at what price?
• Margin — what do you actually keep after eBay takes its cut?

Most sellers check one of these — usually just the sale price. They search the product, see it sells for £35, think "I can buy it for £8, that's £27 profit," and buy it. Then they discover that eBay takes 12.9%, payment processing takes another 3%, and there are 40 other sellers listing the same item at £28. The £27 becomes £8 if it sells at all.

All three signals matter. Skip any one of them and you're guessing.

How to find profitable products to sell on eBay: 5 steps

1. 1

   Search completed listings — not active ones

   On eBay, search for the product. In the left-hand filters, tick "Sold Items" under Show Only. This filters to completed sales in the last 90 days — the only data that actually tells you what buyers paid. Active listings show you what sellers hope to get. Sold listings show you what buyers actually paid.

2. 2

   Calculate the sell-through rate (STR)

   Count the number of sold listings (or note the figure shown). Then uncheck "Sold Items" and count total listings (sold + active). Divide sold by total, multiply by 100. That's your STR. A result above 40% is a healthy market. Above 70% means buyers are outpacing sellers — a strong signal to proceed.

3. 3

   Analyse the competition

   Look at the active listings. How many sellers are there? Are prices clustered tightly (competitive) or spread out (room to price strategically)? Check how long the oldest active listings have been sitting — if items have been listed for 60+ days unsold, that's a warning. One or two dominant sellers at rock-bottom prices is a sign to pass.

4. 4

   Calculate your real profit after fees

   Take the average sold price. Subtract: eBay's 12.9% final value fee (on total including postage), payment processing at 2.9% + 30p, your postage cost, and your buy price. What's left is your actual profit — not your hoped-for profit. Use our free profit calculator to do this quickly.

5. 5

   Set your maximum buy price

   Work backwards. Decide your minimum acceptable net profit (e.g. £10). Add back the fees and costs you'll incur. The result is the most you should pay for the item. If the charity shop price is above that number, put it back. No negotiation with the maths.

Worked example: the North Face fleece

Back to that charity shop. The North Face fleece is £12. Here's how the process plays out.

73% STR. Healthy competition. £15 net profit on a £12 spend. Buy it. In fact, if there are more on the rail in the right sizes, buy those too.

Common mistakes that kill your margin

The five-step process is straightforward. Most sellers who lose money aren't failing at the steps — they're skipping them entirely, or making one of these mistakes.

• Checking active listings instead of completed ones. Active listings are aspirational. Completed listings are reality. If you're basing your expected sale price on active listings, you're optimistic by definition.
• Ignoring competition depth. A 70% STR sounds great until you see there are 60 other sellers all priced within £2 of each other. High demand doesn't help if you can't get a competitive price.
• Forgetting about all the fees. Most sellers know about the final value fee. Fewer account for payment processing. Almost nobody accounts for packaging materials and returns. These add up faster than you'd expect.
• Chasing trending products too late. By the time a product is obviously trending, 200 other sellers have already listed it. STR drops as supply catches up. Be early or be elsewhere.

The faster way to do this

The manual method above works. It takes 3–5 minutes per product, which is fine if you're checking one item carefully. If you're walking a car boot with 200 tables, that's not viable.

Privy is a Chrome extension that runs this process automatically on every eBay listing — STR, competition analysis, and full profit calculation — in under 60 seconds, without leaving the page you're already on. You see a product, open the listing on your phone, and Privy gives you a verdict. Buy, pass, or investigate further.

It doesn't replace your judgement. It just stops you needing to spend five minutes per product to exercise it. Try it free — 20 lookups, no card needed — at app.getprivy.co.uk/signup.