Terms of Use
Terms governing use of ShipMargin calculators and information.
Last reviewed: August 31, 2026
Informational tools
ShipMargin provides informational calculations and operational analysis. It does not sell postage, issue carrier quotes, provide tax or accounting advice, or guarantee carrier acceptance.
Verify before acting
Carrier rules, packaging conditions, agreements, and fees can change. Review the linked source and your carrier agreement before purchasing postage or changing operational policy.
Acceptable use
Do not attempt to bypass access controls, upload unlawful data, or misuse the service in a way that harms other users or infrastructure.