The short version
There are no accounts and no forms that store your data. Your measurements stay in your browser; if you copy a result link, they are in that link and nowhere else. We use analytics to count visits and see which calculators are used, and we may show advertising that uses cookies.
What the calculators store
Nothing on our servers. Calculations run in your browser. The Copy link button writes your inputs into the page address so you can share or revisit them; we do not receive that link unless you send it to us.
Analytics
We use Google Analytics 4 to measure page views and a small number of events (a calculation, a link copy, an embed copy). IP addresses are anonymised. You can opt out with the Google Analytics opt-out add-on or a content blocker.
Advertising
We may display advertising served by third-party networks. Those networks may use cookies and similar technologies to show ads based on your visits to this and other sites. You can manage personalised advertising at aboutads.info or youronlinechoices.eu. Where consent is required by law, we will ask for it before any advertising cookie is set.
Affiliate links
Some links to tools and products are affiliate links. If you buy through one, we may earn a commission at no cost to you. The retailer, not this site, handles your purchase and data.
Embedded calculators
When another website embeds one of our calculators, that page loads from our domain inside their site. The same analytics described above apply to the embedded frame; the host site's own privacy policy applies to the rest of the page.
Your rights
You can ask what data we hold about you (normally none) and ask for it to be deleted, by writing to the address on the contact page.
Changes
We will update this page when the way the site works changes, and note the date at the top.