eBay profit calculator: how to work out what you actually keep
Your eBay sale price is not your profit. By the time fees, postage and the cost of your stock come off, you keep a lot less than the headline. An eBay profit calculator does that maths for you. Here is how it works and what it takes into account.
General information, not tax advice. Check with HMRC or a qualified accountant before you act on it.
Why you need one
eBay's fees are easy to underestimate, and most sellers do not track the cost of their stock carefully. That means a lot of people think they are making more than they really are. A profit calculator strips it all back to the number that matters: what you actually keep.
What comes off your sale price
A good eBay profit calculator takes your total sales and subtracts:
- eBay's final value fee, which is charged on the total the buyer pays, including postage.
- The small per-order fee and the regulatory operating fee.
- The postage you paid for labels.
- Packaging costs.
- Any refunds you gave or losses on disputes.
- What you paid for the stock you sold.
The number it gives you
What is left after all of that is your real profit. It is often much lower than the sale price, and seeing the true figure is what helps you price better, spot which items are actually worth selling, and know where you stand for tax.
Profit and tax are linked
Your real profit is also the starting point for tax. If you are trading and over the £1,000 allowance, it is your profit, not your sales, that any tax is based on. So working out your profit properly is the first step to knowing what, if anything, you owe HMRC.
Doing it by hand versus automatically
You can do this in a spreadsheet, but it is tedious across dozens of orders, and easy to miss fees. FlipTally connects to your eBay account, pulls in every sale, fee and postage cost automatically, lets you add your stock costs, and shows your real profit to the penny, plus what you would owe HMRC.
Frequently asked questions
What does an eBay profit calculator work out?
It takes your sale price and subtracts eBay fees, postage, packaging, refunds and the cost of your stock, to show your real profit, which is usually well below the headline sale price.
Does eBay charge fees on postage?
Yes. The final value fee is charged on the total the buyer pays, which includes the postage, so a profit calculator needs to account for that.
Is my eBay profit the same as what I owe tax on?
Your profit is the starting point. If you are trading and over the £1,000 allowance, tax is based on your profit, not your sales, so working out profit properly comes first.
See where you actually stand
Get a rough answer in about a minute with the free calculator, or connect your eBay account to see your real profit and tax.
Related guides
This guide is general information, not tax advice, and reflects the UK rules for the current tax year. Always check with a qualified accountant before you file. FlipTally is independent and not affiliated with, endorsed by or connected to eBay, Vinted, Depop or HMRC. Last updated 2026-08-04.