Know what you keep before you list it.

Every marketplace takes a cut, then shipping, fulfillment, ads, and returns take theirs. These free calculators show the real payout on a sale in seconds, and the guides explain where every dollar goes.

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Payout checkeBay, most categories
Sale price
Final value fee
Shipping label
Item cost
You keep

Calculators

Each one answers a single question you have while sourcing or pricing. Everything runs in your browser, nothing you type is saved, and there's nothing to sign up for.

Guides

16 in-depth explainers on fees, pricing, ads, and the business side of reselling, with worked examples you can check against the calculators.

See all guides

Marketplace fees

Pricing and profit

Advertising

Running the business

Built by a seller, for sellers

I run ML Necessities, a small e-commerce brand selling bundles and everyday essentials on Amazon, Walmart, eBay, TikTok Shop, and our own Shopify store. These calculators started as the spreadsheets I used to decide what to source and where to list it. The guides cover what I learned the hard way, like ad campaigns that quietly ate a month of revenue and a barcode exemption that took three tries.

More about me and this site