MarginPilot is a set of free calculators that show your real net profit — after marketplace fees, fulfillment, shipping, ad cost, tax reserve, and returns — for Amazon, Etsy, eBay, Shopify, Walmart, TikTok Shop and 20+ marketplaces in 20 countries. No signup. You can also embed any calculator on your own site for free, and there's a 2026 report comparing seller fees across 25 marketplaces.
