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Privacy policy

The short version: the numbers you type stay in your browser. We use one analytics tool and standard hosting logs, and nothing else.

Effective date: 21 October 2026

What you type stays on your device

All calculators run as JavaScript in your browser. The lengths, widths, thicknesses and prices you enter are not sent to us and are not stored on our servers. Close the page and they are gone.

Analytics

We use Microsoft Clarity to understand which pages are used and where they break. Clarity may record pages viewed, clicks, scrolling and other interaction events, and it sets cookies. It is not used to identify you by name. Microsoft's handling of that data is covered by the Microsoft privacy statement.

Hosting logs

MaterialCalc is hosted by Netlify. Like any web host, Netlify keeps standard server logs that include IP address, browser type and the URL requested. Those logs are used for security and troubleshooting. See the Netlify privacy policy.

Cookies

The analytics tool sets cookies. We do not run advertising or retargeting cookies. If advertising is added later, this page will be updated before those cookies go live.

Your rights

If you are in the UK or EEA, GDPR gives you the right to ask what personal data is held about you and to request correction or deletion. California residents have similar rights under the CCPA. Email haorufei@126.com and we will respond within the period the law requires. We do not sell personal information.

Children

This site is not directed at children under 13, and we do not knowingly collect information from them.

Changes

If this policy changes, the effective date above will change with it.