Your inputs stay with you

Calculator inputs

Calculations run in your browser. This edition does not send the numbers you enter to an application server and does not store them in an account or database. Inputs remain in the current page while you use it. The application does not write calculator values to cookies or local storage.

Your browser may have its own form-restoration or history features. Those features are controlled by your browser settings, not by a storage system provided by this site. Closing or refreshing a page may reset the calculator to its example values.

Analytics, accounts, and assets

This edition includes no analytics scripts, advertising integrations, user accounts, or tracking cookies. Fonts, illustrations, styles, and calculator scripts are served with the site rather than loaded from third-party asset services.

If the site is served by a hosting provider, ordinary web requests still reach that provider. Its systems may process technical connection information such as an IP address and requested URL. This application does not control the hosting provider's access-log settings.

Copying and printing

A copy action runs only when you activate its control. Where supported and permitted by your browser, it places the displayed result on your clipboard. The site does not read existing clipboard content. Your operating system and other applications control what happens to clipboard content afterwards.

Printing uses your browser's print dialog. You choose whether to print, save a PDF, or cancel. Any file you save through that dialog is managed by your browser and device.

Contact form

When you send a message through the contact page, we process the name, email address, subject and message you provide, together with the time of submission. The message is stored in a private directory on the site’s server and forwarded to the operator’s mailbox so that we can reply. It is kept for as long as needed to handle your request and then deleted.

To limit automated abuse, the form uses a time-limited token, a hidden field that real visitors never fill in, and a hashed form of your connection address that is kept for one hour. No third-party anti-spam service or tracking script is involved.

Consent choice

The cookie banner records your choice for optional categories in your browser’s local storage under the key “sc-consent-v1”. This entry holds only your yes/no choices and the date; it is not sent to a server. You can change it at any time with the “Cookie preferences” control in the footer. The cookie policy lists every category and its current use.

Links and changes

Source links lead to external websites with their own privacy practices. Following a source link sends you to that website; it does not send the calculator’s form values as part of the link.

This notice describes the site as published on 26 September 2026, including its contact form and consent controls. It will be updated before any analytics, advertising, accounts or remote calculation services are added.