eBay Listing Spy — Seller Analytics & Profit Calculator

Instant profit calculations, seller insights, and listing analytics for eBay sellers and buyers.

eBay Listing Spy — Seller Analytics & Profit Calculator Stop guessing your eBay margins. Start knowing them. You found an item to flip. You listed it at $49.99, it sold, and you felt great — until you checked the numbers. The Final Value Fee was higher than you expected. Shipping ate into your margin. You forgot about the per-order fee. And that promoted listing ad rate? That came out of your profit too. Most eBay sellers have been there. The fee structure is not complicated, but it changes by category, and doing the math in your head while browsing listings leads to bad decisions. WHY EBAY PROFIT MATH IS HARDER THAN IT LOOKS eBay fees are not one flat rate. They vary by category — from 3% for heavy equipment to 15% for electronics and jewelry. On top of that: - Final Value Fees apply to the sale price AND shipping charged to the buyer - There is a $0.30 per-order fee on every transaction - International sales add an extra 1.65% - Promoted Listings take another 2-20% depending on your ad rate - Different categories have different fee tiers that are easy to mix up Most sellers either ignore the math or keep a spreadsheet open in another tab. Neither approach works well when you are scanning dozens of listings trying to decide what to source. eBay Listing Spy puts the numbers right where you need them — on the listing page itself. WHAT THIS EXTENSION DOES eBay Listing Spy is a lightweight Chrome extension that adds a floating analytics panel to any eBay listing page. It reads listing data directly from the page, calculates fees instantly, and scores the seller — all without leaving the tab. No spreadsheets. No copy-pasting prices into a calculator. No switching between tabs. Here is what you get: Instant Listing Analytics — See the title, price, condition, listing type, shipping cost, watcher count, quantity sold, quantity available, item location, category, and item ID in one clean panel. No scrolling around the page to find scattered details. Category-Aware Fee Calculation — Final Value Fees are calculated using the correct rate for 13+ eBay categories. Most Categories sit at 13.25%, but Electronics and Jewelry are 15%, Musical Instruments are 6.35%, and Heavy Equipment is just 3%. The extension knows the difference. Seller Trust Score — Every seller gets a trust score from 0 to 100 based on their feedback count, positive feedback percentage, and Top Rated status. The score maps to clear labels: Excellent, Very Good, Good, Fair, or New/Low. Risk flags appear automatically for sellers with limited history or below-average ratings. Full Profit Calculator — Enter your sale price, shipping charged, item cost, and category. Toggle international fees and promoted listing fees on or off. The calculator shows your Final Value Fee, per-order fee, international surcharge, promoted listing cost, net revenue, profit, margin percentage, and break-even price — all in one view. Break-Even Price — The calculator shows the minimum price you need to list at to cover your item cost plus all eBay fees for the selected category. No more guessing whether a deal is worth sourcing. Multi-Currency Support — Works on eBay.com, eBay.co.uk, eBay.de, eBay.fr, eBay.com.au, and eBay.ca. Detects USD, GBP, EUR, AUD, and CAD pricing automatically. HOW IT WORKS 1. Install the extension and navigate to any eBay listing page 2. Click the floating button in the bottom-right corner to open the panel 3. The Listing tab shows all extracted listing details and a quick fee estimate 4. The Seller tab shows the seller trust score, tier, feedback stats, and risk flags 5. The Profit tab lets you run detailed fee calculations with category selection, international fees, and promoted listing support That is it. The panel stays out of your way until you need it, and closes with one click. WHY A FLOATING PANEL INSTEAD OF A POPUP Browser extension popups close the moment you click anywhere on the page. That makes it impossible to reference listing details while using the calculator. A floating side panel stays open while you scroll, compare, and interact with the eBay page. You can check the seller score, glance at the fee breakdown, and keep browsing — all at the same time. REAL SCENARIOS WHERE THIS HELPS Sourcing decisions: You are at a thrift store and found a vintage camera listed for $120 on eBay. You open the listing on your phone, tap the panel, and see the camera category charges 15%. After the $0.30 per-order fee, your net is about $101. You paid $40 for the camera. The panel confirms a $61 profit and 50.8% margin. Worth it. Promoted listing ROI: You are running a promoted listing at 8% on a $75 item. The Profit tab shows that with the 13.25% category fee plus the 8% ad rate, your total fees jump to $16.24. Without the promotion, fees are $10.24. That is $6 per sale going to the ad — you can decide if the extra visibility is worth it. International shipping considerations: A buyer from Germany wants your $200 sneakers. You toggle "International (+1.65%)" in the calculator and watch total fees jump by $3.30. Now you know exactly how much that cross-border sale costs you before accepting. Break-even pricing: You bought a lot of 50 phone cases at $3 each. You need to know the minimum listing price. Enter $3 as cost, select "Cell Phones (15%)" — the break-even price is $3.88. Anything above that is profit. Seller vetting: You are considering buying from a seller with 47 feedback at 94.2%. The Seller tab flags two risks: "Very new seller — limited history" and "Below-average feedback rating." Trust score: 17/100. You decide to look elsewhere. Category fee comparison: You are listing a guitar effects pedal. Is it "Musical Instruments (6.35%)" or "Electronics (15%)" territory? You run both scenarios in the calculator. At $89.99, that is the difference between $6.02 and $13.80 in Final Value Fees alone. WHAT THIS EXTENSION DOES NOT DO - It does not access your eBay account, login credentials, or any personal data - It does not send any data to external servers — all calculations happen locally in your browser - It does not modify, create, or interact with any eBay listings or transactions - It does not inject ads, trackers, or analytics scripts The only permissions it uses: - storage — Saves your usage stats locally (listings analyzed count) - tabs — Detects when you navigate to an eBay listing page That is it. No network requests. No external APIs. Everything runs locally. FREE TIER All features are available in the free tier. There are no usage limits, no feature gates, and no trial periods. The analytics panel, seller scoring, and profit calculator work on every eBay listing you visit. THE MATH BEHIND THE FEE CALCULATOR Final Value Fee = (Sale Price + Shipping Charged) x Category Rate Per-Order Fee = $0.30 (flat, every transaction) International Fee = (Sale Price + Shipping Charged) x 1.65% Promoted Listing Fee = Sale Price x Ad Rate % Total Fees = Final Value Fee + Per-Order Fee + International Fee + Promoted Fee Net Revenue = Sale Price + Shipping Charged - Total Fees Profit = Net Revenue - Item Cost Margin = (Profit / Sale Price) x 100 Break-Even Price = (Item Cost + $0.30) / (1 - Category Rate) Category rates used: - Most Categories: 13.25% - Books / Movies / Music: 14.95% - Electronics / Cell Phones / Cameras / Jewelry / Watches: 15% - Clothing / Shoes / Video Games / Coins / Trading Cards: 13.25% - Musical Instruments / Business and Industrial: 6.35% - Guitars and Basses: 6% - Heavy Equipment: 3% No hidden logic. No rounding tricks. The formulas match eBay's published fee schedule. WHO THIS IS FOR - eBay resellers who source items and need to know margins before buying - Casual sellers who want to understand what eBay takes from each sale - Buyers who want to evaluate seller credibility before purchasing - Dropshippers comparing eBay fees across categories - Arbitrage sellers who need fast, accurate profit calculations on the go GETTING STARTED Install, navigate to any eBay listing, and click the floating button. Your first fee breakdown appears in under a second. No account needed. No sign-up. No credit card. Just clarity on your eBay numbers.