How your data is handled

This site is a math tool. Your calculator inputs (vial size, water volume, syringe, target dose) are processed in your browser and are not saved anywhere. We do not run analytics, do not use tracking cookies of our own, and do not build profiles of visitors.

The only data this site stores on its own behalf is a rough count of ad clicks: which ad space was clicked, which page it was on, and the time. No name, email, IP address, or device identifier is stored with those counts.

Everything you type into the calculator stays in your browser. The math runs locally, and nothing is transmitted or stored when you calculate.

One exception: if you press "Explain my numbers," the values you entered are sent to an AI service to generate the plain-language explanation you see. The numbers are used only to produce that response — they are not stored, and no account or identity is attached to them.

Ads on this site are served by Google AdSense, and their iframes are sealed off from this page — we cannot see directly when an ad is clicked. To get a rough signal of which ad spaces perform, this site makes a best guess: if your pointer is over an ad and the browser window loses focus (which usually means you clicked into the ad), that is counted as a click.

For each such event we store three things: the ad space's identifier (for example "calculator top banner"), the page it appeared on, and the time. We deliberately store nothing about you — no cookies, no IP address, no browser fingerprint, no session identifier. These counts exist only so the site owner can compare them against Google's own AdSense report.

This is an inference, not a certainty — it can miss clicks and occasionally count a non-click. It involves no cookies and no personal data, so it does not require a cookie consent notice.

Advertising on this site is provided by Google AdSense. Google, as a third-party vendor, uses cookies (including the DoubleClick cookie) to serve ads based on your prior visits to this and other websites.

You can opt out of personalized advertising by visiting Google's Ads Settings (adssettings.google.com), and google.com/policies/technologies/ads explains in full how Google uses data in advertising. Google's partner policies are described at google.com/policies/technologies/partner-sites.

We do not control and cannot access the data Google collects through its ad cookies. Any personalized-advertising choices are managed in your Google account, not on this site.

Your light/dark theme choice is saved in your browser's local storage under a single key ("theme") so the site remembers it on your next visit. It never leaves your device and is not readable by us as personal data.

The site owner uses a private, sign-in-protected page to view ad-click statistics. Signing in requires an account with our authentication provider; for that account we store the email address and sign-in identity, and a role flag that grants access to the stats page. New sign-ups are disabled, so only the owner can hold an account.

If you are a regular visitor, this does not apply to you: there is no visitor account system, and nothing about your visit creates one.

We do not sell data. We do not share data with advertisers or data brokers. We do not run third-party analytics (no Google Analytics, no pixels). We do not set advertising or tracking cookies ourselves. We do not collect health information — the numbers you enter are arithmetic inputs, and they are not saved.

If this policy changes materially, the updated version will be posted on this page with a revised date. Questions about this policy can be sent to the site owner through the contact channel published on this domain.