Cookie Policy

Last updated: 8 November 2026.

What cookies are

Cookies are small text files that a website asks your browser to store on your device. They let a site remember things between pages and visits — for example, that someone is signed in, or that a visit is a returning visit rather than a new one.

Strictly necessary cookies

Our host sets cookies that the site needs in order to work and stay secure — delivering pages and protecting the site from abuse. The site's admin area also uses sign-in session cookies, but only for the people who run the site; ordinary visitors never receive them.

Analytics cookies

We use Google Analytics (GA4) to count visits and see which pages are used, in aggregate. It sets cookies such as _ga for that purpose. Google Analytics never sees the figures typed into the calculators — those stay in your browser and are not sent anywhere by this site.

Advertising cookies

The site currently shows no adverts and sets no advertising cookies. If that changes, this page and the privacy policy will be updated first, before the change goes live. Advertising partners, including Google, may then use cookies to serve ads based on your prior visits to this and other sites, and you will be able to opt out of personalised advertising at google.com/settings/ads and aboutads.info/choices.

Controlling cookies

You can block or delete cookies in your browser's settings; the calculators keep working, because they run entirely on your device. To opt out of Google Analytics specifically, Google provides an Analytics opt-out add-on for desktop browsers.

Changes to this policy

If the cookies this site uses change, this page will be updated, and the date at the top will change with it.