Seller Fee Calculator

Calculate seller fees, profit, and payouts in a Chrome side panel, beside the page you are already working on.

Seller Fee Calculator puts marketplace, payment, advertising, and pricing math into a Chrome side panel, right beside the page you are already working on. Open a supported selling, payments, ads, or pricing page and the panel preselects the calculators that fit that page. You can also open it from the toolbar on any page. Change an input and the result updates as you type, so you stop retyping the same numbers into a separate website. What it works out Selling fees, net profit, and payout for the marketplaces and payment processors you use, including a side-by-side processor comparison and international fees. Advertising returns and unit economics. Operating costs such as storage and fulfillment, referral and commission, shipping, and sales tax. Currency conversion, and usage-based AI pricing where cost scales with tokens. Every rate is an assumption you control Each fee rate is an editable input. The defaults follow currently published fee schedules, but what a marketplace actually charges depends on your category, your seller level or store subscription, the country you sell in, and the size and weight of the item. Where a rate moves with any of those, the panel shows it as an assumption you set rather than presenting one number as universal. Confirm your own rate on your seller fee page before you price on it. What it does not do It does not read your selling accounts, and it does not touch page content, cookies, browsing history, or passwords. The page address is used only to choose which calculators to show. Your inputs and preferences stay in Chrome storage on your device. There is no account to create and no remote code. Free to use. ---