Privacy

Our calculators run entirely in your browser. The numbers you enter are not sent to us or stored by us.

We do not use cookies and we do not ask you to create an account. We use privacy-friendly, cookie-free analytics to count page views in aggregate.

To learn which calculators are useful, each page also reports, when you leave it, how long it was open and in use, how far it was scrolled, and whether the calculator was used, a result copied or the page printed. These are counts and yes/no answers only: never the numbers you enter, and no cookie, account or other identifier. We keep the page address, the site you came from, your country and the network operator, the last two as Cloudflare reports them, so that visits from data centers and other robots can be told apart.

The site is served through Cloudflare, which processes technical request data (such as IP addresses) to deliver and protect the site.