Privacy in plain words
This site has no cookies, no analytics, no advertising tags, no third-party scripts and no email list. There is nothing to opt out of, because nothing is collected.
What happens when you use a calculator
Your inputs are turned into a result in your own browser. To make a result shareable, they are written into the page's address (the part after the ?). That address is yours: it is not sent to us, and we have no server that receives it. If you share the link, whoever opens it sees the numbers you put in — share accordingly.
What we do not do
- No cookies are set by this site, and no cookie banner is needed because there is nothing to consent to.
- No analytics, pixels, session recorders, heatmaps or A/B tools.
- No fonts, scripts or stylesheets loaded from other companies. The page you read is served from one place.
- No accounts, no logins, no forms that submit anywhere, no email capture.
- No price monitoring of anything you look at, and no alerts of any kind.
- No selling, sharing or transferring of any kind of data, because none is collected.
When you click a link to a retailer
Links to the retailer's own pages are ordinary destination links with an affiliate identifier attached. When you click one you leave this site and the retailer's own privacy notice applies from that point — including whatever cookies their site sets to attribute a purchase. That is their tracking, on their domain, not ours, and it is the one place where this site results in any data being collected about you at all.
The affiliate arrangement: As an Amazon Associate I earn from qualifying purchases. It does not change the price you pay.
There is no newsletter and no mailing list. The address on this site is a contact address for corrections; writing to it is optional and nothing is stored beyond the ordinary contents of an email.
Children
This site is general information about subscription pricing and is not directed at children.
Changes
If this policy ever changes, the change will be stated here with a date. The version you are reading was last updated 2026-10-03.