Privacy Policy

Last updated: July 2026. This Privacy Policy describes how VivMetric handles information when you access or use the website. The core principle of VivMetric is data minimization: no personal information is intentionally collected, and every calculator runs entirely in your own web browser using client-side JavaScript, with no input values transmitted to the VivMetric web server at any point.

No Personal Data Collection

VivMetric does not collect, receive, store, process, transmit, or retain any personal information, health information, or calculator input data from visitors. All calculator operations on the site are executed entirely within the visitor's web browser by standard client-side JavaScript code. When you enter numerical values into any calculator (for example, height, weight, age, gender, activity level, or sleep duration), those values are read from the input form, used to compute a mathematical result using the standard formulas described on each page, and the result is written back to the same HTML document in your browser. At no point during this process are the input values, the output values, or any intermediate calculation state transmitted via an HTTP request to the VivMetric server.

All Calculations Run Locally in Your Browser

Every calculator on VivMetric — including the BMI Calculator, BMR Calculator, TDEE Calculator, Body Fat Calculator, Calorie Deficit Calculator, Water Intake Calculator, Sleep Cycle Calculator, and all other tools — performs its mathematical computation entirely within your browser using standard client-side JavaScript. The calculation never leaves your device:

• No input values are sent to any server;
• No output values are sent to any server;
• No intermediate calculation state is sent to any server;
• No calculator result is stored on any server;
• The moment you close the browser tab, all calculator values are discarded.

VivMetric does not operate any account registration system, email newsletter, comment section, contact form with server submission, user profile system, saved-results feature, calculator history archive, or any other server-side feature that would require or incentivize the collection of personally identifiable information.

No Cookies for Tracking

VivMetric itself sets a total of zero first-party cookies. The site does not use cookies for session management, authentication, user identification, tracking, or advertising segmentation. No cookie banner consent is stored as a cookie — it is stored exclusively in browser LocalStorage. The only two LocalStorage entries VivMetric uses are:

• vivmetric-theme — stores your dark/light mode preference ("light" or "dark")
• vivmetric-cookie-consent — stores your cookie consent choice (accept or reject)

Neither LocalStorage entry contains any personal data, any calculator input, or any identifier that could be used to recognize you across different devices or websites. You may clear these entries at any time using your browser's standard site-data-clearance controls.

Analytics Use

VivMetric uses Google Analytics 4 (GA4, Measurement ID G-VN9Z66GCP9) to collect anonymous, aggregated website usage statistics. GA4 is configured with IP anonymization enabled (anonymize_ip: true), meaning the last octet of your IP address is truncated by Google before storage. The statistics collected include:

• Pages viewed and approximate geographic region (country or city level)
• Device type, browser family, and operating system
• Referral source and session duration
• General page-level interaction data

These statistics are used exclusively by VivMetric to understand which pages and calculators are most frequently visited, to identify broken pages or user experience issues, and to prioritize content corrections. No calculator input values, output values, or health metrics are ever sent to GA4. GA4 data is retained by Google for 14 months with automatic reset on new activity.

Third-Party Services

Google AdSense

VivMetric serves display advertising through the Google AdSense program to offset hosting and maintenance costs. AdSense is a third-party advertising network owned by Google LLC. AdSense may display interest-based (personalized) ads to visitors depending on your consent state, Google Ad Settings, and applicable privacy regulation. For visitors who have declined ad personalization or who are in regions where opt-out is the default, non-personalized contextual ads are served based solely on the content of the current VivMetric page being viewed.

VivMetric does not receive any individual ad personalization data, does not pass any data to Google for ad targeting, and does not set or read any AdSense cookies directly. Visitors may opt out of personalized advertising at any time by visiting Google's Ad Settings page.

How to Control Your Data

Because VivMetric intentionally collects almost no personal data, your control rights are primarily exercised through your browser and through third-party tool settings:

• Block third-party cookies in your browser settings to prevent analytics and advertising tracking
• Install the Google Analytics Opt-out Browser Add-on to opt out of GA4 tracking
• Configure your Global Privacy Control (GPC) browser signal to opt out of "sale" of personal information under CCPA
• Clear site data for vivmetric.com at any time using your browser's site data controls
• Reset preferences via the cookie consent banner on any VivMetric page

Children's Privacy

VivMetric does not knowingly collect, solicit, or receive personal information from children under the age of 13 (COPPA), under the age of 16 (EU GDPR), or under any other age threshold established by applicable local law. The site is not directed to children, and no marketing activity is targeted at children. Because VivMetric does not operate registration forms, email submission forms, or any other personal information input field other than pure numerical calculator inputs that are never transmitted, the practical ability to knowingly collect children's personal data does not exist.

Contact for Privacy Inquiries

For all privacy-related communications — including CCPA consumer requests, GDPR access/rectification/erasure requests, children's privacy notices, cookie consent support, security incident notifications, and general privacy questions — please use the contact channel specified on the Contact Us page, addressed to the Privacy Coordinator. All privacy-related communications are processed and retained only for the duration required to resolve the inquiry and for statutory record-keeping purposes.

Frequently Asked Questions