Last updated 30 July 2026
Your measurements never leave your browser.
Everything this calculator works out, it works out on your device. There is no account, no upload and no server that receives what you measure. This page says exactly what that does and does not cover.
What we collect
Nothing that identifies you, and nothing you measure. There is no account system, no login, no contact form and no server-side copy of your ledger. We do not run analytics on this site.
What is stored on your device
When you add areas to the ledger, the calculator writes them to your browser's localStorage under the key sqftcalc_v1. That is the same mechanism a form uses to remember what you typed if the tab closes. It stays on your device, no other website can read it, and we cannot read it from anywhere.
Two ways to remove it: the Clear all button in the footer of the calculator, or clearing site data in your browser. Either wipes it completely.
Fonts and other third parties
The typefaces on this site are served from this domain, not from Google Fonts. Loading them from Google would send your IP address to Google on every page view, so we host them ourselves. At the time of writing, a fresh page load makes no third-party requests at all.
Advertising
As of 30 July 2026 this site serves no advertising and sets no advertising cookies. We intend to fund the site with Google AdSense. When that is switched on:
- Google and its partners will set cookies on this site. That is true even of non-personalised ads, which still use cookies for frequency capping and fraud prevention.
- A consent notice will appear before any ad loads if you are in the EEA, the UK or Switzerland, and you will be able to decline.
- Advertisers never receive your measurements. The ledger is not readable by anything outside this page's own scripts.
- This page will be updated with a new date, and the cookie policy will list what is set.
We would rather tell you a narrow thing that stays true than a broad thing that expires.
Check it yourself
Type a measurement into the calculator, then open your browser's developer tools and watch the Network tab. No request carries your numbers. The arithmetic is JavaScript running on your machine.
Export and import
You can export your ledger as a JSON file and import it later. The file goes wherever your browser puts downloads. We never receive it. Imported files are validated before anything is read from them.
Children
This is a construction estimating tool and is not directed at children. We do not knowingly collect information from anyone, of any age, because we do not collect information.
Your choices
- Clear stored measurements: Clear all in the calculator footer.
- Block cookies entirely: your browser's site settings.
- Control Google ad personalisation across the web: Google My Ad Center.
- Opt out of many other networks at once: optout.aboutads.info.
If this changes
Any change gets a new date at the top of this page, and anything that starts collecting data gets a visible notice on the calculator itself. We will not retroactively collect from people who relied on an earlier version of this page.
Contact
Questions about privacy: hello@sqftcalc.com.