Privacy Policy

This service is a calculator in which a parent or carer enters a child's weight, height and head circumference to see the percentile among peers and the age in months. There are no accounts, and nothing at all that identifies the child or the carer is collected.

The birth date, measuring date, due date, weight, height and head circumference you type are information about a child's health, so we treat them as sensitive. They are used inside this browser only for the calculation; they do not reach our server, are not kept in browser storage, and are not placed in the address bar. Reload the page and the fields are empty again. A share feature was deliberately left out.

The person the information belongs to is the child, not the person typing. Handling personal data about a child under fourteen requires a legal guardian's consent; because this service handles no personal data, that procedure never arises. There is no field for the child's name.

What we never send

• What you type. The birth date, weight, height, head circumference and due date never leave this browser.
• What you type is never stored either. There is no code that uses browser storage, and results are not kept.
• IP addresses and device information (User-Agent) are not read, and no cookies are used.
• Notifications. None are sent, and permission for them is never requested.
• Connections leaving this site are blocked at the browser level (with ad servers as the only exception when ads are on), so even code that tried to send something could not.

This site is served through Cloudflare, which automatically injects a visit-tracking script into our pages. We did not add it, so we have configured your browser to refuse it. That means the tracking call does not go out. The tag itself is still injected by that layer though, so we would rather you know about it than not. We do not use cookies.

What stays on this device

• Neither the values you type nor the results. There is no code that uses this browser's storage.
• While a tab is open, the names of the steps already reached are kept in session storage, which disappears when the tab closes, so that the same signal is not sent twice. No typed value is kept there.

Anonymous signals the server receives

• Step names (visit, calculation done, calculation with the due date field used, first input), the interface language, the channel label we wrote into our own link or the domain of the previous page (never the path or query), and the date you arrived (day only, no clock time).
• No typed value is included. Which dates you entered, how many kilograms, and what the result was are not sent. That the due date field was used arrives only as a step name.
• If something breaks on screen, that fact reaches the same place: we send only the error name (TypeError, for example) and an eight-character fingerprint of where it happened. We never send the error message, the stack, or the address. At most three per visit.
• These signals live in short-term server logs only and are never shared with third parties. We may show Google AdSense ads to cover running costs; Google may then use cookies or ad identifiers under its own policy.

How to delete

There is nothing to delete. Close or reload the page and what you typed is gone, and no child's value exists on the server to request removal from.

Business registration details and a contact address will be posted here once registration is complete.