About MarginKit

MarginKit is a free toolkit for e-commerce sellers and performance marketers. It's built by a team that works hands-on with GA4, Google Tag Manager, Google Ads and technical SEO for online brands.

Every tool is built around one question: after fees, costs and ads, what do you actually keep?

How we keep the numbers accurate

• Marketplace fee data is stored in one place and checked whenever Amazon, Shopify or Etsy publish changes. Each tool shows the date its data was last updated.
• Formulas are shown on every page, so you can check the maths yourself.
• Results are estimates for planning. Always confirm final fees in your seller account.

Need help with ads or tracking?

We also help brands fix GA4 tracking and grow profitable ad campaigns. Get in touch.