If you're reselling on eBay, you probably have a rough idea of how much money you're making. But do you know your real profit? After eBay fees, shipping costs, PayPal or managed payments fees, cost of goods, and supplies — most resellers are shocked to learn they've been overestimating their earnings.

In this guide, we'll walk through how to accurately track your eBay profits and the tools that make it easier.

Why Most Resellers Don't Know Their True Profit

Here's a scenario that's all too common: you sell an item for $50 on eBay. You bought it for $10 at a thrift store. Awesome — $40 profit, right?

Not quite. Here's what actually happens:

That's $23.07 — not $40. If you're only tracking revenue minus what you paid, you're overestimating profit by 73%. (Want to run the math on your own items? Try our free eBay profit calculator.)

The Spreadsheet Approach

Many resellers start with a spreadsheet. It works, but it has limitations:

• Manual data entry for every sale, fee, and shipping cost
• Easy to forget expenses like packaging, gas, and subscription fees
• No automatic eBay sync — you're copying data by hand
• Gets unwieldy after a few hundred items

If you're selling fewer than 20 items a month, a spreadsheet can work. Beyond that, the time spent maintaining it starts cutting into your sourcing time.

What to Track for Accurate Profit

At minimum, you need to track these for every sale:

1. Cost of goods (COGS) — What you paid for the item
2. eBay fees — Final value fee + per-order fee + any promoted listing fees (see our complete breakdown of eBay fees)
3. Shipping costs — Postage, packaging materials
4. Platform fees — eBay store subscription, if applicable
5. Other expenses — Gas for sourcing trips, storage costs, supplies

The key insight is linking each sale back to its purchase. When you sell something, you need to know exactly what you paid for it — not just a rough estimate.

Using BinFlip to Automate Profit Tracking

BinFlip was built specifically for this problem. Here's how it works:

1. Log your purchases — Record what you bought, where, and how much you paid per item
2. Sync eBay sales — BinFlip connects to your eBay account and imports sales automatically
3. SKU linking — Each sale is matched to its purchase item via SKU, so the cost of goods is always accurate
4. Fee tracking — eBay fees and shipping costs are pulled directly from the sale data
5. True profit calculation — Revenue minus COGS minus fees minus shipping = your real number

No more guessing. No more spreadsheet formulas that break when you add a column.

Key Metrics Every Reseller Should Monitor

Beyond per-item profit, keep an eye on:

• Profit margin — What percentage of revenue you actually keep
• Average days to sell — How long items sit in inventory
• Return on investment (ROI) — Profit divided by cost of goods
• Cost per sourcing trip — Are some sourcing locations more profitable than others?

These metrics help you make smarter sourcing decisions. If your average margin is 40% on clothing but 65% on electronics, that tells you where to focus. Good metrics also depend on good inventory management — check out the 5 inventory mistakes that cost resellers money.

Getting Started

Whether you use a spreadsheet, BinFlip, or another tool — the most important thing is to start tracking something. Even imperfect tracking is better than guessing.

If you want to skip the spreadsheet setup and get started immediately, try BinFlip free for 14 days. You can connect your eBay account in minutes and start seeing your real profit today.