Privacy Policy
Every gravel sum is worked out on your own device. Lengths, widths and depths you enter never reach a server and are not saved.
What the host sees
There is nothing to sign up for on Gravel Calculator, and no form or comment box to fill in. Pages are delivered through Cloudflare, whose servers see the usual details of any web request (your IP address, browser and the address you asked for) in order to send the page and block attacks. Cloudflare's privacy policy covers that data.
What your browser remembers
If you switch the calculator to metric, your browser's local storage keeps that one choice so the calculator opens in metric next time. No measurement is stored with it, it stays on your device, and deleting the site's data in your browser settings wipes it.
Analytics
We use Google Analytics 4, a service from Google, to count visits and see which pages people use and how they arrive (for example from a search engine). It collects data such as pages viewed, approximate location (country or city, derived from the IP address, which Google does not store), device and browser type, and the referring site. We do not use it for advertising, and we do not send it names, email addresses or any length, width, depth or other number you type into the calculator. Data is kept for 14 months (the GA4 retention setting).
Visitors in the EEA, the UK and Switzerland, and visitors whose country cannot be determined, are asked first, and analytics only runs if they accept. You can change your choice at any time with the "Cookie settings" button in the footer, and choosing Reject deletes the Google Analytics cookies. You can also block it with Google's opt-out add-on or your browser's privacy settings. Google's privacy policy explains how Google handles this data.
Cookies
Google Analytics sets two first-party cookies, _ga and _ga_T3HNFV1VEY, which last up to 2 years and tell repeat visits apart. They are only set once analytics is allowed (straight away outside the EEA, the UK and Switzerland, and only after you accept inside them or when your country cannot be detected). No advertising cookies are set, and no ads run on this site. Your cookie choice itself is kept in your browser's local storage so the question is not asked on every page.
If you email admin@gravelcalculatr.com, your message and address are read only so a reply can be sent, and nobody else receives them.
Children
Gravel Calculator is written for adults planning building and garden work. It is not aimed at children under 13 and does not set out to gather anything about them.
Changes
Any revision appears here, with the "Updated" date moved to the day of the change.