Privacy

Last updated: November 13, 2026.

Information entered here

The calculator runs in your browser. Its measurements are not submitted to an application server or saved by this website. There are no accounts, contact forms or mailing lists in this edition.

Optional Google Analytics

When configured on the main domain, Google Analytics 4 is loaded only after you select “Allow analytics.” It measures page visits, clicks to download our SVG patterns, calculator submissions and which numbered tutorial headings are viewed. A download event records a link click, not proof that the file was saved or the project completed. We do not intentionally send your name, email address, calculator dimensions or URL query strings.

Your analytics preference is saved in browser local storage for up to 180 days. You can change it with “Analytics preferences” in the footer. Analytics is disabled on local and temporary preview domains. Until the main site's measurement ID is configured, no Google Analytics tag loads.

If you allow analytics, Google may use first-party analytics cookies and process standard device, connection and interaction data to produce reports. Advertising storage, Google signals and ad personalization are not enabled by this site's configuration. See Google's privacy policy and Google's Analytics opt-out information.

Fonts and hosting

The pages request fonts from Google Fonts, which receives standard connection information such as your IP address. If the font service is unavailable, your browser uses fallback fonts. See Google Fonts' privacy information. Hosting and access services are governed by their providers' policies.