Cookie Policy
Which cookies this site uses: Google AdSense advertising cookies only with your consent.
This site shows advertising from Google AdSense, which uses cookies — but only the ones you agree to. Calculators still run entirely in your browser; nothing you type into them is sent to us or to Google.
Cookies used on this site
| Name | Set by | Purpose | Type | Lasts |
|---|---|---|---|---|
| FCCDCF, FCNEC | Google (consent message) | Remembers the advertising-consent choice you make | Strictly necessary | Up to 13 months |
| __gads, __gpi, __eoi | Google AdSense | Ad serving, frequency capping and measurement | Advertising — only after consent | Up to 13 months |
| IDE, test_cookie (doubleclick.net) | Google ad partners | Personalised ads and measurement | Advertising — only after consent | Up to 13 months |
Your choices
On your first visit from the UK or EEA you see a consent message from Google’s certified consent management platform (IAB Transparency & Consent Framework) with an equal-prominence option not to consent. Declining still lets you use every page; you may then see non-personalised ads or none. You can change your choice at any time: Privacy and cookie settings.
Third parties
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 you based on your visit to this site and/or other sites on the Internet. You can opt out of personalised advertising in Google Ads Settings, and read how Google uses information from sites that use its services at policies.google.com/technologies/partner-sites.
What we use that sets no cookies
- Hosting and security (Cloudflare). Standard server logs; when it challenges suspicious traffic it may set a strictly-necessary security cookie for that visit. Not used for advertising or profiling.
- Analytics. Cloudflare Web Analytics — cookie-free, aggregate page counts that cannot identify you.
- Usage beacon. The name of a calculator used and the page, with the connection’s country. No cookie, no identifier, none of your inputs.
Managing cookies
Every browser lets you block or delete cookies (look under Privacy or Site settings). Blocking cookies does not affect any calculator on this site.
Last reviewed: 29 August 2026.