About & privacy

Written and sources reviewed: 2026-11-14

Editorial approach

We separate published documentation, arithmetic examples and assumptions. Existing and free options remain valid choices. No hands-on product test or personal experience is claimed unless it has actually been performed and documented. We correct material errors when identified.

Privacy

Calculator inputs are processed in your browser and are not sent to the publisher. We use Cloudflare Web Analytics to count page views and measure loading times. It does not use analytics cookies or receive your calculator inputs. Cloudflare also processes connection information to deliver and protect the site. External sites apply their own terms and privacy policies.

Publisher and scope

This independent information site is edited under the site name above. We do not sell products, accept orders, provide individual setup services or handle customer support for the products mentioned.

Corrections and rights notices

To report an error or a rights concern, email paperfern.desk@gmail.com and include the page URL.