Terms of Use

Last updated: 2026

Use of the site

SewMath's calculators are free to use, whether you're sewing for yourself or professionally. You're welcome to link to any page.

No warranties

The calculators and the explanatory content are provided "as is". We work to keep the math correct — each page shows its rules of thumb so you can verify them — but we can't guarantee the site is free of errors, and results are informational only. Real projects depend on the fabric, the pattern, and the cutter that no calculator can see, so treat the outputs as planning estimates, not promises.

Limitation of liability

To the maximum extent permitted by law, SewMath is not liable for any loss or damage arising from use of this site — including a project that comes up half a row short. Buy the extra quarter yard.

Third-party links and ads

Pages may contain links to third-party sites and third-party advertising. We're not responsible for the content or practices of external sites. See our Privacy Policy for how advertising works here.

Changes

We may update these terms; the current version will always live at this page.