Last updated October 3, 2026.
Calculator inputs
All calculations run in your browser. The values you enter are not sent to our servers or to analytics providers. When you useShare link, your inputs are placed in the part of the URL after #, which browsers don't send to web servers. Anyone you share the link with can see those inputs.
Saved projects and preferences
"Save project" and your unit preference (imperial or metric) are stored in your browser's local storage on your device. We can't see them. Clear your browser data, or delete projects on the Saved page, to remove them.
Analytics
If enabled, we use Google Analytics to understand which pages are useful, for example page views and whether a calculator was used. We record only event names and the calculator's name, never the numbers you enter. In the EEA, UK and Switzerland, analytics and advertising storage are denied by default unless you consent.
Our host, Cloudflare, also provides privacy-first Web Analytics. It counts page views and measures page performance without cookies or cross-site tracking. See Cloudflare Web Analytics.
Advertising
We may show ads from Google or other ad partners. These partners may use cookies to show relevant ads. Where the law requires it, we ask for consent through a certified consent management platform before personalized ads are shown. You can control personalized Google ads atadssettings.google.com.
Embedded calculators
When a calculator is embedded on another website, it runs the same way: inputs stay in the visitor's browser. The embed doesn't set cookies or run analytics.
Contact
Questions about privacy? Email buildcalc2026@gmail.com.