Privacy Policy
This Privacy Policy describes how materialscalc.org ("we," "us," or "the site") handles information when you visit and use the calculators and articles published here.
1. Information we collect
The site is a static website with no user accounts, sign-ups, or forms. The only information collected is what is automatically gathered by your browser when visiting any website:
- IP address and approximate location (country / region)
- Browser type and version, operating system, device type
- Pages visited, time spent, and referring URL
- Aggregated, non-personally-identifying interaction signals (e.g., clicks, scroll depth)
We do not collect names, email addresses, payment information, or any other directly identifying data, because the site does not ask for it.
2. Cookies and tracking technologies
This site uses cookies and similar technologies for the following purposes:
- Site analytics — Cloudflare Web Analytics. Privacy-friendly, no cookies in most regions; provides aggregated traffic data.
- Advertising — Google AdSense places cookies (e.g.,
DSID,IDE,NID) to serve relevant ads, measure performance, and prevent fraud. You can review and adjust your ad preferences in Google Ads Settings. - Consent state — If you are visiting from the EEA, UK, or Switzerland, Google's Consent Management Platform stores your consent choice in a cookie so that the consent banner does not reappear on every page.
You may block or delete cookies in your browser settings; doing so may affect site functionality and which ads are shown.
3. Advertising
This site displays advertisements served by Google AdSense, a third-party advertising service operated by Google LLC. AdSense may use cookies and pixel tags to serve ads relevant to your interests. Some ads may be personalized based on prior visits to this and other websites.
Google's use of advertising cookies enables it and its partners to serve ads to users based on visits to this and other sites on the Internet. To opt out of personalized advertising:
- Visit Google Ads Settings
- Visit aboutads.info (Digital Advertising Alliance opt-out)
- EU/UK users: visit youronlinechoices.eu
4. Affiliate links
Many links to products on this site are affiliate links. When you click through and make a purchase, we may earn a small commission at no additional cost to you. Specifically, we participate in:
- The Amazon Services LLC Associates Program
- The Home Depot affiliate program (via Impact)
Affiliate commissions help fund the site's hosting and content development. They do not influence which products are recommended; products are chosen based on whether they fit the calculation context (e.g., a concrete float for a slab pour). All calculator results are estimates — verify with a tape measure and your local supplier before purchasing.
5. Your rights (GDPR — EEA/UK residents)
If you are located in the European Economic Area, the United Kingdom, or Switzerland, you have the following rights under the General Data Protection Regulation (GDPR) and equivalent laws:
- Right of access to personal data we hold about you
- Right to rectification of inaccurate data
- Right to erasure ("right to be forgotten")
- Right to restrict or object to processing
- Right to data portability
- Right to withdraw consent at any time (use the cookie-consent banner's "Manage options")
- Right to lodge a complaint with your national data protection authority
Because this site collects only minimal, non-identifying data and does not sell user data, most requests resolve as "no data on file." For verifiable requests, contact us at the address below.
6. Your rights (CCPA — California residents)
California residents have the right under the California Consumer Privacy Act (CCPA) to:
- Know what personal information is collected
- Request deletion of personal information
- Opt out of the sale of personal information — note that this site does not sell personal information
- Not be discriminated against for exercising these rights
To exercise California rights, contact us at the address below.
7. Children's privacy (COPPA)
This site is not directed to children under 13. We do not knowingly collect personal information from children. If you believe a child has provided personal information, contact us and we will delete it.
8. Data retention
We do not maintain a database of visitors. Cloudflare and Google may retain server logs and aggregated analytics per their respective retention policies. Affiliate networks retain click data per their terms.
9. Changes to this policy
We may update this Privacy Policy. The "Last updated" date at the top reflects the most recent revision. Continued use of the site after changes indicates acceptance.
10. Contact
For privacy questions, GDPR/CCPA requests, or affiliate disclosure questions, contact:
Email: [email protected]