Privacy Policy

Last updated: October 11, 2026

Clinical calculators handle identifiable information. We built ChronoCalc with a simple principle: your data stays on your device. This privacy policy explains exactly what that means — and what we deliberately do not do.

How Calculation Works (Local-Only)

When you enter a date of birth, testing date, or gestational age into any ChronoCalc tool, the math runs entirely in your web browser using JavaScript. The calculation engine executes on your computer or tablet — not on a ChronoCalc server.

This means:

• No date of birth is transmitted over the internet to us
• No calculation result is stored on our servers
• No patient or client identifiers are collected
• Closing the browser tab clears the session — we retain nothing

You can verify this yourself: open ChronoCalc with your browser's developer tools (Network tab) active, enter dates, and click Calculate. You will see no outbound requests containing the dates you entered.

Information We Do Not Collect

ChronoCalc is designed to collect as little data as possible. We do not collect, store, or process:

• Dates of birth or testing dates entered into calculators
• Gestational ages or prematurity data
• Calculated age results
• Names, patient IDs, or any personal identifiers
• IP addresses tied to calculator usage
• Location data from your device
• Browser fingerprints for individual tracking

Analytics

ChronoCalc does not embed Google Analytics, Google Tag Manager, a Meta Pixel, or session-recording tools. Calculator pages load the age-math script and static assets. When advertising is enabled, Google’s ad and consent scripts load on content pages only. They are not loaded on the privacy policy, terms, or contact page.

Cookies

The calculator does not need an account cookie. Your browser may store small site preferences locally. When ads are on, Google AdSense and Funding Choices may set advertising and consent cookies. You can block cookies in your browser and manage ad personalization from the links below.

Google AdSense and advertising partners

Google is a third-party vendor on content pages. Google uses cookies, including the DoubleClick cookie and other advertising cookies, to serve ads based on visits to this site and other sites on the Internet. Calculator dates are not sent to Google as ad parameters: those values stay in the page’s JavaScript and are not included in the ad request by our code.

• Third-party vendors, including Google, use cookies to serve ads based on a user’s prior visits to this website or other websites.
• Google’s use of advertising cookies enables it and its partners to serve ads based on visits to this site and other sites.
• You can opt out of personalized advertising at Google Ads Settings, or opt out of some third-party cookies at aboutads.info.
• See How Google uses information from sites that use our services.

Ad scripts run in your browser and receive your IP address, as any third-party request does. ChronoCalc does not control cookies set by Google. Visitors in the EEA, UK, and Switzerland see Google’s consent message before personalized ads are used.

Third-party hosting logs

ChronoCalc does not share calculator input or results with third parties. The static site is hosted on infrastructure that may log standard server access data (IP address, user agent, requested URL) for security and uptime. Those logs do not contain dates of birth or calculation inputs, because those values never reach the server.

We do not sell calculator inputs. Advertising cookies are controlled by Google under the links above, not by a ChronoCalc database of birth dates.

Clinical and HIPAA Context

ChronoCalc is a general-purpose age calculation tool, not a covered entity under HIPAA. However, we recognize that clinicians use our tools in HIPAA-regulated workflows. Local-only processing means:

• Entering a client's date of birth does not create a record on our systems
• No Business Associate Agreement (BAA) is required for calculator use because no PHI is transmitted to us
• Your organization's existing device and browser security policies govern local data handling

We recommend following your institution's policies for entering client information into any web-based tool, even one that processes data locally.

Contact Form

If you use our contact page, the information you voluntarily submit (name, email, message) is used solely to respond to your inquiry. Contact form data is not used for marketing and is not shared with third parties.

Children's Privacy

ChronoCalc is written for adults — clinicians, educators, and parents — who compute age for children and adolescents. It is not a site directed at children. We do not knowingly collect personal information from children. Calculator inputs are processed locally and never submitted to our servers.

Changes to This Policy

If we update this privacy policy, we will revise the "Last updated" date at the top of this page. Material changes that affect how data is handled will be noted prominently. Our core commitment — local-only calculation with no server-side date storage — will not change without clear notice.

Contact

Questions about privacy? Email [email protected] or use our contact page.