Work out fees and profit before you set the price
Free calculators for sellers on Etsy, Amazon, eBay and Ukrainian marketplaces. No sign-up, instant results.
Choose a calculator
Etsy Fee Calculator
Every fee on one order: listing, transaction, payment processing, ads.
Etsy Profit Calculator
What is left after fees, shipping and the cost of goods.
Free Shipping Price Calculator
Build shipping into the price without losing margin.
Offsite Ads Fee Calculator
What an order from Etsy’s ad channel really costs.
Target Price Calculator
The price you need to hit your margin.
Amazon Price Calculator
The selling price that reaches your target margin after Amazon fees.
Amazon Referral Fee Calculator
Amazon’s category commission on your product.
FBA Profit & ROI Calculator
Net profit and return on every purchase.
FBA vs FBM Calculator
Amazon warehouse or your own shipping: which wins.
eBay Fee Calculator
All selling fees for one listing in one total.
eBay Profit Calculator
What remains after fees, shipping and cost.
Browse by marketplace
Each marketplace has its own page with a fee overview, a guide to which calculator to use and answers to common questions.
Etsy
Transaction, payment processing, listing and Offsite Ads fees, with payment rates by seller country.
Amazon FBA
Referral fees by category, FBA profit and ROI, target price, and FBA versus FBM.
eBay
Final value fee by category, per-order and insertion fees, and monthly store profit.
What Fee Math is for
Online marketplaces rarely charge one fee. A single order can carry a transaction fee, a payment fee, a listing fee, an advertising fee and a fixed per-order charge, each calculated on a different base. Added up in your head they look small. Added up across a year they decide whether a product is worth selling at all.
Fee Math puts those charges in one place. You enter a price and your costs, and the calculator shows every fee as its own line with the rate behind it, then what is left for you. You can see where the money goes, change one number and watch the result move, and use the answer to set a price that actually earns what you expect.
Why the numbers can be trusted
Every rate lives in a single data file and each calculator page shows when its rates were last checked and links to the marketplace’s own fee page. Where a figure cannot be taken from an official source, such as Amazon’s FBA fulfilment fees which depend on exact size and weight, the calculator asks you to enter it instead of guessing. Where a rate comes from a news source rather than an official page, the page says so. The formulas are pure functions covered by automated tests, and everything is calculated in your browser, so your prices and costs are never sent anywhere. The methodology page explains this in detail.
Who these calculators are for
They are for individual sellers and small shops: makers on Etsy deciding whether free shipping is affordable, Amazon sellers checking a product before they order stock, eBay resellers who want to know what a flip really earns, and Ukrainian sellers who need to see marketplace fees and sole proprietor taxes side by side.
How to use a calculator
- Pick your marketplace
Choose Etsy, Amazon, eBay or Ukraine and open the calculator that matches your question.
- Enter your price and costs
Type the selling price, what the item costs you and what shipping costs. Defaults are filled in so you see a result at once.
- Read the breakdown
Every fee appears as its own line. Adjust a number to see how a different price, country or ad share changes your profit.
Why you can trust the numbers
Open a calculator and get your result at once, no account and no email.
Your prices and costs never leave your device and are never sent to a server.
Every page shows when its rates were last updated and links to the marketplace’s own fee page.
Frequently asked questions
Is Fee Math free?
Yes. All calculators are free to use, with no sign-up and no email.
Are my prices and costs stored anywhere?
No. Calculations run in your browser and nothing you type is sent to a server.
Where do the rates come from?
From the marketplaces’ own fee pages, linked on each calculator with the date they were last checked. A few Ukrainian rates come from news sources and are marked as such.
How accurate are the results?
They are estimates built on published rates. Marketplaces change fees, apply fees by account type and add charges such as VAT on fees that are not modelled. Treat the result as a close estimate and confirm it against your own statements.
Which marketplaces are covered?
Etsy, Amazon (US), eBay (US) and, in Ukrainian, Prom.ua, Rozetka, Nova Poshta cash on delivery and the FOP group 3 tax. Etsy payment rates are included for 14 countries and regions.