Privacy policy

Last updated: 2026-09-19

The short version

• What you type into a calculator stays in your browser. It is not sent to us and we do not store it.
• There are no accounts, and we do not ask for your name or contact details to use the site.
• If advertising is shown, Google and other advertising partners may use cookies and similar technologies, as explained below.

What we collect

The calculators run entirely in your browser. The figures you enter are not transmitted to our servers. If you email us, we receive your email address and message, and we use them only to reply. This site is served by a web host that may keep standard server logs, such as IP address and requested page, for security and reliability.

We do not currently use analytics tools. If we add one, we will update this page and, where the law requires, ask for your consent first.

Advertising and cookies

This site may show advertisements served by Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to users based on their visit to this site and other sites on the internet.

Depending on where you are and the choices you make, ads may be personalised or non-personalised. You can opt out of personalised advertising in Google Ads Settings, or visit aboutads.info to opt out of some third-party vendors' use of cookies for personalised advertising. You can read how Google uses data from sites that use its services on Google's advertising and privacy page, and on Google's Business Data Responsibility page.

If you are in the European Economic Area, the United Kingdom or Switzerland, we ask for your consent, through a consent management platform certified by Google, before advertising cookies or similar technologies are used for ads personalisation. You can refuse, and you will still be able to use every calculator.

Children

This site is not directed at children under 13, and we do not knowingly collect personal information from children.

Your rights

Because we hold almost no personal data, there is little for us to disclose or delete. If you have emailed us and want your message removed, or you have any privacy question, contact us using the details on our contact page. Depending on where you live, you may also have rights over data held by advertising partners, which you can exercise with them directly.

Changes to this policy

We will change this page if our practices change, and update the date at the top.