Privacy Policy

Last updated: July 2026

The short version

The dates and details you enter into our calculators never leave your device. All calculations run locally in your browser using JavaScript. We do not store, transmit or log the birth dates, test dates or gestational ages you type.

Information we collect

Calculator inputs: none collected. Inputs are processed in your browser and discarded when you leave the page.

Server logs: like nearly all websites, our hosting provider may automatically record standard technical data such as IP address, browser type and pages visited, used for security and to keep the site running.

Analytics: if we use analytics, it is limited to aggregate, non-identifying statistics (such as page views) to understand which tools are useful. We do not build profiles of individual visitors.

Cookies and advertising

The calculators themselves do not require cookies. If advertising is displayed on this site in the future, ad providers (such as Google AdSense) may use cookies to serve relevant ads; any such use will be governed by their policies, and this page will be updated accordingly. You can control cookies through your browser settings.

Third-party services

Pages load fonts from Google Fonts, which involves a request to Google servers. No calculator data is included in those requests.

Children

Our tools are frequently used about children (by parents and professionals), but they are not directed at children and we knowingly collect no personal information from anyone.

Changes and contact

We may update this policy as the site evolves; the date above reflects the latest revision. Questions? Reach us via the contact page.