Cookie policy
Last updated:
Cookies are small files a website saves in your browser. This page lists the ones that may be set when you use this site. The privacy policy explains how your data is handled more widely.
Cookies this site sets itself
None. The calculators do not save anything in your browser, and the site does not use analytics cookies. Every cookie below comes from Google AdSense, which shows the ads.
Advertising cookies from Google AdSense
Google and its advertising partners use these to show ads, limit how often you see the same ad, measure how ads perform and detect fraud. They are used to personalise ads only if you consent in Google's consent message. Not every cookie is set on every visit.
| Cookie | Set on | What it is for | How long it lasts |
|---|---|---|---|
| __gads | This site | Advertising and security. Lets sites show Google ads. | 13 months |
| __gpi | This site | Advertising and security. | 13 months |
| __gpi_optout | This site | Advertising. Used when ad personalisation is turned off. | 13 months |
| __eoi | This site | Security. | 6 months |
| IDE | doubleclick.net | Shows Google ads on non-Google sites, and personalises them if you have agreed to that. | 13 months in the UK |
| id | doubleclick.net | Advertising and security. Also remembers if you have turned off personalised ads. | 13 months in the UK. An opt-out lasts until 2030 |
| DSID | doubleclick.net | Identifies a signed-in Google user on other sites, so their ad personalisation setting is respected. | 2 weeks |
| test_cookie | doubleclick.net | Functionality. Checks whether your browser accepts cookies. | 15 minutes |
| TESTCOOKIESENABLED | doubleclick.net | Functionality. Checks whether your browser accepts cookies. | 60 seconds |
| GED_PLAYLIST_ACTIVITY | This site | Advertising. | Until you close your browser |
| ACLK_DATA | This site | Advertising. | 5 minutes |
Cookies from the consent message
Google's consent message needs to remember your answer, so that it does not ask again on every page.
| Cookie | Set on | What it is for | How long it lasts |
|---|---|---|---|
| FCCDCF | This site | Functionality. Stores the choice you made in the consent message. | 13 months |
| FCNEC | This site | Analytics for the consent message. | 365 days |
Change your cookie settings
Use the "Privacy and cookie settings" link at the bottom of any page to reopen Google's consent message and change your choice. You can do this as often as you like.
If nothing opens, your browser or an ad blocker is probably blocking Google's script. You can also:
- delete or block cookies in your browser's settings
- manage ad personalisation across Google in My Ad Centre
Where this list comes from
The names, purposes and durations are the ones Google publishes in its list of advertising cookies and its page on how Google uses cookies. Google can change them, so those pages are the most up to date.