Price a product wrong once, and you pay for it on every single sale.

Marketplace fees don’t come one at a time — they stack. Referral fee, fulfillment fee, listing fee, storage, the returns you know are coming, the ads you need to get seen. By the time they all land, the “profit” you counted on can be half of what you expected — or gone entirely.

The Multi-Marketplace Profit & Pricing Calculator does the whole stack for you, in one screen, for the four marketplaces most sellers actually use: Walmart, Etsy, Amazon and eBay — using the marketplaces’ US 2026 published fee schedules.

The 3 modes

1. Profit Check — where does a sale’s money actually go?
Pick your marketplace, category and fulfillment style, then enter your selling price, product cost, shipping cost, weight, storage, return rate, cost per return, ad spend % and any other costs. You get a line-by-line breakdown — referral fee, WFS/FBA fulfillment fee, Etsy listing fee, expected returns, advertising — plus the four numbers that matter: net profit per unit, net margin, ROI, and your break-even price.

2. Reverse Pricing — start from the margin you want.
Work backwards instead of forwards. Enter your costs and the net margin you refuse to go below, and the calculator finds the selling price that still hits that margin after every fee — and shows you the full breakdown at that price so you can sanity-check it before you list.

3. Compare Platforms — same product, four marketplaces, one winner.
Run the same product and the same price through Walmart, Etsy, Amazon and eBay at once, in each platform’s natural fulfillment mode (WFS, FBA, self-ship). Fees, total costs, net profit and margin in one table — with the most profitable platform highlighted, so “where should I sell this?” becomes a 30-second answer instead of a spreadsheet weekend.

Built for how sellers actually work
– Fulfillment styles covered: WFS (Walmart Fulfillment Services), FBA, FBM, self-ship and dropship — including dropshipping math with supplier shipping and expected returns.
– Category referral tiers where the marketplace uses them (e.g. Walmart and Amazon category rates), not one flat guess.
– Save named scenarios in your browser — test “Walmart WFS vs Amazon FBA” once, keep both, reload them any time.
– Export to CSV — send any breakdown or the full platform comparison to a spreadsheet file with one click.

Who it’s for
Walmart Marketplace sellers (WFS and dropship), Etsy sellers, Amazon FBA/FBM sellers and eBay sellers who price products themselves — especially multi-channel sellers deciding where a product makes the most money, and anyone who has ever been surprised by a payout that was smaller than the profit they “calculated.”

What’s included
– profit-calculator.html — the complete calculator (one single file, ~36 KB)
– README.txt — quick-start guide: how to open it and what each mode does
– Free lifetime updates to the file

How delivery works
This is a digital download. Right after checkout you can download the ZIP file. Unzip it, double-click profit-calculator.html, and it opens in your browser — that’s the whole setup. No installation, no account, no subscription, no internet connection needed after download. It works 100% offline and nothing you type ever leaves your computer.

Requirements
– Any modern web browser (Chrome, Edge, Firefox or Safari)
– Windows, Mac or Chromebook
– Nothing else — if your computer can open a web page, it can run this calculator

Please note
Fee schedules are the marketplaces’ US 2026 published rates, provided as estimates for planning only. Marketplaces can and do change their fees — always confirm current rates in your seller account before making business decisions. This tool is not financial, tax or accounting advice.

Questions before or after buying? Message us or email support@diginomad818.com — we’re happy to help.