Privacy
A short page, because there is very little to describe.
No analytics scripts, no advertising scripts, no tracking cookies, and no registration or personal details required. Whatever you type into the tools stays in your own browser.
What we don't do
- No web analytics. There is no Google Analytics or equivalent on this site, and no placeholder tag left in either.
- No ad scripts and no third-party tracking. There are no ad slots.
- No cookies used to track you. Page features — the navigation toggle, the language dropdown, the copy button — do not rely on cookies.
- No external fonts or scripts. The stylesheet and script are served from this domain, so browsing here makes no requests to third parties.
Where the numbers you type go
Nowhere. The calculations run in your browser, in the page's own script. Nothing is sent to a server and nothing is stored locally. Refresh or close the page and the inputs are gone.
Each tool page says this too — we treat it as part of describing the tool rather than something to bury on a privacy page.
Server logs
As with almost any website, the server hosting this site may record ordinary technical information when it responds to a request: the time, the page requested, the IP address and the browser identifier. That is used to keep the service running and secure. It is not used to profile you, and it is not sold or exchanged.
When you write to [email protected] we see your address and the contents of your message. Those are used to reply to you. They do not go onto a mailing list and they are not shared with third parties.
External links
We link to exchange pages and other external sites. Once you follow one, you are under that operator's privacy policy, which is outside our control. Links carrying a referral parameter identify this site as the source to the destination; the detail is in disclosure.
Your rights
Because we create no user accounts and collect no personally identifying information, there is usually no "your data" here to access, correct or delete. If you believe we hold information relating to you — an email you sent, for instance — write and ask for it to be deleted and we will do that.
Changes
If this note changes substantively we will update this page and log a line in corrections. The current version describes the site as at August 2026.