Last updated: 12 November 2026.
What cookies are, which ones this site uses (very few), and how you can control or delete them.
What cookies are
Cookies are small text files that a website asks your browser to store on your device. They are widely used to remember preferences, keep you signed in, or measure how a site is used. Related technologies — such as your browser’s local storage — work in a similar way.
Cookies on this site
The calculator sets no cookies and uses no local storage. The numbers you type are processed in the open page and are gone when you close or reload it; nothing about your calculations is remembered between visits, and there is no account to sign into. The site’s light or dark appearance follows your device’s own system setting, which your browser reports to the page — it is not stored by us in a cookie.
Third-party cookies
This site does not embed third-party advertising, social media widgets or analytics trackers, and so does not knowingly allow third parties to set cookies through it. If you follow a link from this site to an external website, that site may set its own cookies under its own policy — we recommend checking the cookie policy of any site you visit.
If this changes
If the site ever adds a feature that needs cookies — for example, remembering a display preference or measuring visits in aggregate — this policy will be updated to name the cookie, its purpose and how long it lasts, before or at the time the feature launches, and the date at the top of this page will change.
How you can control cookies
- Browser settings: every major browser lets you view, block and delete cookies — look for “Privacy” or “Site settings” in Chrome, Safari, Firefox or Edge settings.
- Private browsing: using a private or incognito window means any cookies set during the session are deleted when you close it.
- Blocking all cookies: you can block cookies entirely; this site will still work in full, because it does not depend on them. Some other websites may not.
Questions
If anything in this policy is unclear, contact us via the Contact page. See also our Privacy Policy for the wider picture of how this site handles data.