Gravel Calculators Gravel Calculators

Privacy Policy

This policy describes exactly what data this website handles. It is short because the site deliberately collects almost nothing. It reflects the site's actual implementation; if the implementation changes, this page changes with it.

Last reviewed: 8 November 2026 by Ian Welkins

The short version

  • Every calculator runs entirely in your browser. The numbers you enter are never sent to a server, logged, or shared.
  • The site uses two analytics services — Google Analytics 4 and Ahrefs Web Analytics — both loaded through Cloudflare Zaraz, to count usage events. Neither receives anything you type into the calculators.
  • Google Analytics 4 sets standard analytics cookies (_ga); Ahrefs Web Analytics is cookieless.
  • The hosting provider (Cloudflare) processes standard technical request logs as part of serving the site.
  • If you email me, I receive your email address and message, and use it only to respond.

How the calculators process information

All calculations — volumes, weights, bag counts, and costs — are performed by JavaScript running locally in your browser. Calculator inputs (dimensions, depth, material choice, price) are:

  • never transmitted to any server by this site;
  • never written into URLs, cookies, or browser storage;
  • never sent to Google Analytics, Ahrefs Web Analytics, or any other service.

You can verify this yourself: nothing you type into a calculator is sent anywhere. The only requests that fire while you browse are the analytics events described above, and they never include your inputs. If a future feature ever needs to send data anywhere (for example, an "email me this estimate" option), it will be strictly opt-in, disclosed here first, and never applied to inputs you enter without your explicit action.

What data is collected

The calculators collect nothing. Analytics (see below) collect aggregate usage information; no names, emails or precise locations are collected. Personal information can be provided only by emailing me directly or by using the optional error-report form.

Hosting (third-party service)

The site is served by Cloudflare Pages. Like essentially all web hosts, Cloudflare processes technical request logs (such as IP address, user agent, requested URL, and timestamps) to deliver pages, protect against abuse, and operate its service. This site does not use those logs to profile visitors, and calculator inputs are not part of any URL, so they never appear in request logs. Cloudflare's own handling of operational data is described in Cloudflare's privacy documentation.

Analytics

This site uses two analytics services to understand which tools and pages are useful. Both are loaded through Cloudflare Zaraz:

  • Google Analytics 4 (GA4) records page views and usage events (for example, "a calculator was used", "results were copied"), along with device/browser type, approximate location at city or country level, and the referring page. GA4 uses first-party cookies (_ga and related identifiers) to distinguish visits. It does not receive anything you type into the calculators. Google's own handling is described in Google's Privacy Policy.
  • Ahrefs Web Analytics records page views, referrers, and rough device/browser information. It is cookieless: it sets no cookies and does not identify individual visitors across sites. Ahrefs' handling is described in Ahrefs' privacy documentation.

Analytics events never include the dimensions, prices, or any other values you enter — only that a tool was used. No names, emails, addresses, or precise locations are collected by either service on this site's behalf.

You can opt out of Google Analytics with Google's official opt-out browser add-on, or block both services with any standard ad-blocking or tracking-protection browser extension — every part of this site works fully without them.

Advertising (Google AdSense)

When advertising is enabled on this site, it is served by Google AdSense, which may set advertising cookies (for example, to personalize ads and measure their performance). Google's use of advertising cookies is described in Google's advertising documentation, and you can control ad personalization in Google's Ads Settings.

Cookies

This site sets Google Analytics 4's standard first-party cookies (_ga and related identifiers) to measure aggregate visits. Ahrefs Web Analytics sets none. The calculators themselves do not use cookies or browser storage — nothing you enter is stored anywhere on your device or ours.

Error-report form

The error-report form sends nothing by itself. When you submit it, your browser opens your own email app with the report pre-written and addressed to [email protected]; nothing reaches me unless you choose to send that email. The report contains only what you put in the fields — the page or tool, the problem description, any input values you choose to include, and an optional email address. If your device has no email app set up, the page shows the report as copyable text instead. Submitting is entirely voluntary, and the email field is optional.

Contacting me

If you email [email protected], I receive the address and content you send. It is used only to read and reply to your message, is not added to any mailing list, and is not shared with third parties.

Changes to this policy

If this policy changes, the change will be described on this page with the "Last reviewed" date above updated. Questions about anything here are welcome at the address above. See also the terms of use.