About
What Margin Ruler is and what it is not.
Amazon FBA is active. Other marketplace modules stay marked as planned until audited.
Margin Ruler publishes source-dated seller-margin diagnostics for FBA profit, margin leak, shipping overpay, returns, break-even ad spend, and inventory carrying cost. Published fee inputs are dated to assumptions, no account or email is required, and estimates stay private unless a user saves them.
How this site works: This site provides free informational cost estimation tools. Where configured, the site includes clearly disclosed partnerships with independent third-party services. We do not run lead forms, pay-per-call, or call-routing. See our affiliate disclosure for details.
Privacy: No user accounts. No lead forms. No cross-site behavioral profiling. Full privacy policy.