Legal

Privacy notice

Effective October 11, 2026. This website does not require a public account or use advertising cookies. When online, calculator measurements are sent to this site’s own server to verify the calculation; they are not saved. Offline calculations stay on your device.

Offline storage

The service worker stores public site files on your device so the calculator can work offline. Your theme preference is stored locally. You can remove this data through browser settings.

Administration

The private owner dashboard uses a strictly necessary session cookie. Failed sign-in attempts are recorded using a keyed hash of the network address for rate limiting and security auditing.

Analytics

GA4 and Search Console reporting are not connected. Before optional analytics is enabled, this notice and any legally required consent controls must be updated.

Contact

Owner contact details must be supplied before production launch.