General Information Only
Everything published on SellerGrowthTools.com is for general information and educational purposes. It is not professional advice, and it is not tailored to your situation.
Nothing on this site constitutes financial, tax, legal, accounting, or business advice. If you need advice specific to your circumstances, consult a qualified professional in your jurisdiction.
Every tool here is free, runs in your browser, and needs no account. Nothing you type is uploaded, stored, or shared — the maths happens on your own device.
These tools exist because eBay’s own fee structure is scattered across a dozen help pages, and most sellers only find out what they actually earned when the payout lands. Work the numbers out first instead.
eBay Fee Calculator
What it does: Enter your sale price, postage and item cost, and it works out the final value fee, the fixed per-order charge, any Promoted Listings spend, and what actually lands in your account.
Best for: checking a price before you list, or working out why a payout came in lower than expected.
Supports the UK, US, Canada and Australia, with separate handling for Shop subscribers and non-subscribers. Category rates differ significantly — trainers and handbags are not charged the same as books — so the calculator lets you set the rate rather than assuming one flat number.
eBay ROI Calculator
What it does: Takes your cost price, selling price and fees, then returns profit, profit margin, return on investment, and the break-even price you cannot sell below.
Best for: sourcing decisions — deciding whether a car boot find or wholesale pallet is worth buying at all.
Margin and ROI are not the same thing, and confusing them is how sellers end up busy but not profitable. A £4 profit on a £6 item is a far better return than a £4 profit on a £40 item, even though the profit figure is identical. This calculator shows both so you can compare stock properly.
The break-even figure is the one most sellers skip. It tells you the absolute floor for accepting a Best Offer, before you start losing money on a sale.
eBay Image Checker & Resizer
What it does: Checks whether a photo meets eBay’s file size and dimension requirements, and resizes it in one click if it doesn’t.
Best for: phone photos that eBay rejects mid-listing for no obvious reason.
Modern phone cameras produce files well over eBay’s size limit, and eBay’s error message rarely explains which rule you’ve broken. This tool tells you before you waste ten minutes on a failed upload. Your image never leaves your browser — there is no upload step at all.
Why These Tools Are Free
There is no signup, no email wall, and no paid tier. The site is funded by advertising, which means the tools stay open to anyone who needs them — including sellers shifting a handful of items a month, who are exactly the people most likely to get caught out by fees.
We don’t ask for your eBay login, and we don’t connect to your account. Everything is calculated from the figures you type in.
How Accurate Are They?
The calculators use publicly documented eBay fee structures and are reviewed when eBay announces changes. They are accurate for standard selling situations.
They cannot account for everything, though. Account-level promotional rates, category-specific exceptions, international currency conversion charges, and regulatory operating fees in some regions can all shift the real number. Treat the output as a close estimate and check anything borderline against your own eBay account.
Full details of what the calculators can and cannot account for are set out in our Disclaimer.
Guides That Go With the Tools
A calculator gives you a number. These guides explain what sits behind it:
- eBay Selling Fees (2026) — every charge explained, UK and US
- Promoted Listings Fees — how ad rates affect your margin
- eBay Shipping Costs — the expense most sellers underestimate
- Managed Payments — when your money actually arrives
What’s Coming
An Amazon fee calculator is next, followed by Etsy and TikTok Shop tools as those guides are built out. If there’s a calculation you keep doing manually, tell us — that’s how the first three got built.