Privacy Policy

Last updated: 2025-09-29

Overview

Calculator inputs run locally in your browser; we don’t store your weight, activity, or results. We show advertising and use measurement to improve the site.

Advertising & cookies (AdSense)

We use Google AdSense. Google and partners may use cookies to serve and measure ads. In the EEA/UK we use a consent banner. Until you grant consent, we set ad storage and related signals to denied (Consent Mode v2).

What we collect

Calculator inputs: not collected or stored by us.
Contact emails: used only to respond.
Diagnostics: privacy‑respecting analytics in aggregate.

Information we process

Calculator inputs: processed locally in your browser—not sent to our servers.
Diagnostics & measurement: aggregated usage data to improve the site.
Ads: Google and partners may use cookies to serve/measure ads; choices are honored via Consent Mode where applicable.
Contact emails: used only to respond to you.

Cookies & similar technologies

Ad and measurement cookies may be used to deliver and measure advertising. In the EEA/UK, we ask for your consent and honor your choices. You can also control cookies through your browser settings.

Your choices

Use the consent prompt (EEA/UK) to allow or deny ad/measurement.
Adjust browser settings to block/clear cookies.
Email us to delete messages you’ve sent.
Use industry opt‑outs such as aboutads.info/choices and your region’s equivalent.

Data retention

We retain contact emails only as long as needed to respond. Aggregated usage data may be kept to understand trends; it does not include your calculator inputs.

Children’s privacy

This site is for general audiences and is not directed to children under 13. Parents or guardians can contact us to remove any information inadvertently sent to us.

Changes to this policy

We may update this page to reflect changes in practices or legal requirements. Significant changes will be noted at the top with an updated date.

What Data We Collect

Usage data: anonymized page views, device/browser type, and approximate region for aggregate analytics.
Calculator inputs: processed locally to show your hydration estimate; where possible we do not persist these values.
Contact messages: if you email us, we store your message to reply and improve the tool.

How We Use Data

Improve copy clarity, examples, and UI accessibility.
Identify bugs and performance issues.
Plan features (e.g., altitude presets, reminder options).

Cookies & Local Storage

We may use cookies or local storage for preferences (units, theme) and aggregated analytics. You can clear or block them in your browser settings.

Your Choices

Use the tool without providing personal identifiers.
Clear cookies/local storage at any time.
Contact us for data requests or deletion.

Last updated: November 07, 2025

Data Retention

We keep contact messages and support tickets only as long as necessary to address your request and improve the service. Aggregated analytics may be retained for trend analysis.

Third-Party Links

Our pages may link to third-party sites. Their privacy practices are their own; review their policies before providing personal information.

Children’s Privacy

This site is intended for general audiences and is not directed to children. If you believe a child has provided us information, contact us to request deletion.

International Visitors

Servers and vendors may operate in multiple regions. By using the site, you understand information may be processed outside your jurisdiction.

Security Practices

Principle of least privilege for internal access.
Vendor risk review for analytics and hosting providers.
Routine dependency updates and issue patching.