Privacy
The short version
This is a single-page calculator with no backend, and the privacy policy is short because of that.
Your lipid panel never leaves your browser.
There are no cookies, no analytics scripts and no advertising.
There are no accounts, so there is nothing to log in to or leak.
The fonts are served from this site, so no third party is contacted when the page loads.
Your numbers are visible in the address bar, because that is how a result becomes a shareable link.
What happens to the numbers you type
Nothing is transmitted. The arithmetic runs in JavaScript inside your browser, and the page makes no request containing your values. Nothing you type is written to a database, a log on this site's side, or any storage on your device: the site sets no cookies and uses no local storage.
The one exception: the address bar
To make a result shareable, the page writes the three values and the unit into the URL, for example/index.html?tc=200&hdl=50&tg=150. That is deliberate: it is what lets you send a colleague a link that reproduces your calculation, and it is why you can bookmark or print a result.
Consequences worth knowing: the values sit in your browsing history and in any bookmark you make, they appear on screen if you share your screen, and if you paste a permalink into an email or a message the recipient can read it. Close the tab or edit the address bar to remove them. Nothing is sent to this site's servers by that mechanism — the page only ever reads its own URL.
Hosting and server logs
The site is a set of static files served by a hosting provider. Like essentially all web hosts, the provider may record your IP address, user agent and the pages requested, for security and abuse prevention. Those logs are operated by the hosting provider under its own terms, not by this site, and this site has no access to your browser data beyond what a standard web server sees.
Third parties
There are none at runtime. Fonts are self-hosted from this domain, so loading a page makes no request to Google Fonts or any other font CDN. There is no advertising, no embedded content, no social widgets and no consent banner, because there is nothing to consent to. Reference links point to PubMed, which you visit only by choosing to click them.
Children
This site is written for adults reading their own laboratory results. It is not directed at children, and it collects nothing from anyone.
Changes
This policy describes the site as built on 16 September 2026. If the site ever adds analytics, an account system or any server-side storage, this page will change first and the date at the top will move.
Questions about any of this: hello@ldlcalculation.com.
A calculator that cannot leak your results.
The arithmetic happens in your browser and stops there. Share a link when you want to, never because the site sent it anywhere.