Privacy Policy

Last updated: 3 September 2026

The short version

The calculators on this site run entirely in your browser. The numbers you type are never sent to us, never stored on a server, and never leave your device.

Information we collect

Calculator inputs: none are collected. All calculations happen locally in your browser using JavaScript. Closing the tab discards them.

Server logs: our hosting provider records standard technical information when a page is requested — IP address, browser type, referring page, and timestamp. This is used for security and to keep the site running, and is handled under the hosting provider's own privacy terms.

Contact messages: if you email us, we keep that message and your email address so we can reply.

Cookies

This site does not set cookies for advertising or tracking. If analytics or advertising are added in future, this policy will be updated before they go live, and any consent required in your jurisdiction will be requested at that time.

Affiliate links

Some outbound links to third-party software are affiliate links. When you click one, the destination site may set its own cookies to attribute the referral. We receive aggregate reporting from those programs (for example, how many referrals converted) — never your personal details. See the affiliate disclosure for more.

Third parties

We do not sell, rent, or share personal information. Third parties involved in running the site are limited to our hosting provider and, where you choose to click through, the affiliate programs described above.

Your rights

Because we hold essentially no personal data about visitors, there is usually nothing to access, correct, or delete. If you have emailed us and want that correspondence removed, ask us and we'll delete it.

Changes to this policy

If this policy changes, the "last updated" date above will change with it. Material changes — such as introducing analytics or advertising — will be reflected here before they take effect.