What do you really make on each sale?
Type a price and your costs, and see the profit on eBay, Amazon, Shopify and Etsy after every UK fee. Nothing you type leaves your browser.
Your figures stay yours
MarginCheck works out your margins on your device. Your costs, prices, fee settings and saved products are never sent to our server: they're stored in this browser, so you can come back to them without an account.
- Private by design. The page fetches its own files and a visitor count from Cloudflare (no cookies), and nothing else. Your figures aren't in any of it.
- Saved on this device. Saved products live in the browser you saved them in. They don't sync to another computer or phone: use Back up and Restore in the More menu to move them.
- Yours to keep or clear. Clearing the browser's site data removes them, and Safari clears a site's storage after a week without a visit, so keep a backup of anything you'd miss.
- Share links carry your figures. Copy link puts the current product's figures into the link itself, after the # sign, where the server never sees them. Anyone you send it to can read them.
More in the privacy note, and the sums behind every number in how it works.
Enter a cost price to begin. Add a selling price, or leave it blank to see the price for your target margin.
UK fees, checked 5 October 2026 (Etsy's from seller guides). How each one is worked out.
What if scenario
No change yet: drag a slider in What if… below.
| Platform | Each | Profit | Margin | vs your figures |
|---|---|---|---|---|
| eBay | ||||
| Amazon | ||||
| Shopify | ||||
| Etsy |
eBay breakdown
Every line
Multi-buy
Buy more, pay less: each tier takes a discount off the single price, with postage and packaging once per order.
| Qty | Discount | Each | Order | Profit | Margin |
|---|
What if…test a price, a discount, an ad rate or a multi-buy without changing your figures
The scenario's figures show in the "What if scenario" box under the cards. Your typed figures stay as they are.