Privacy Policy

Last updated: May 21, 2026

This Privacy Policy explains how ChargeMath (“we”, “us”, or the “site”) handles information when you visit this website. The short version: the calculators run entirely in your browser, we don’t ask you to create an account, and the values you type into a calculator are never sent to us.

Information you provide directly

The only time you actively share information with us is when you email us through our contact page. In that case, we receive whatever you choose to put in the email: your email address (so we can reply), your name if you sign it, and whatever message you wrote. We use this only to respond to you and do not share it.

Calculator inputs (battery sizes, dollar amounts, miles, electricity rates, etc.) are processed entirely in your browser and are not sent to us or stored anywhere.

Information collected automatically

Like nearly every website, we receive some basic technical data whenever you visit a page:

  • Server / CDN logs. The site is hosted on Cloudflare Pages. Cloudflare logs your IP address, browser user-agent, referring URL, and request time for security, performance, and abuse prevention. See Cloudflare’s own privacy policy for details on how it processes this data.
  • Aggregate analytics. We may use privacy-friendly aggregate analytics (e.g., Cloudflare Web Analytics or similar) to understand which pages are useful. This data is anonymized at the source and does not track individuals across sessions.
  • Cookies. The site itself does not set first-party cookies. Third-party services we use (advertising, analytics) may set their own — see “Advertising” below.

Advertising

We display advertising to keep this site free to use. Our advertising partner is Google AdSense. Google and its partners may use cookies and similar technologies to:

  • Serve ads based on your prior visits to this and other sites (interest-based advertising)
  • Limit the number of times you see an ad
  • Measure ad performance
  • Detect ad fraud

Google’s use of advertising cookies enables it and its partners to serve ads based on visits to our site and other sites across the internet. You can:

For more about how Google uses information from sites that use its services, see policies.google.com/technologies/partner-sites.

Data retention

Calculator inputs are not retained — they live only in your browser and disappear when you close the page. Email messages sent to us are retained as long as needed to respond and follow up. Server logs are retained per Cloudflare’s standard retention periods. We do not maintain databases of individual user activity.

Your rights

Depending on where you live, you may have rights under privacy laws including the EU General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA):

  • Right to access — ask what personal data we have about you (in practice, usually just your email if you've contacted us).
  • Right to deletion — ask us to delete any personal data we have about you.
  • Right to object — opt out of certain processing, including personalised advertising (see “Advertising” above).
  • Right to portability — request a copy of any personal data we hold about you.

To exercise any of these rights, email hello@chargemath.app.

Third-party links

This site links to other websites — manufacturer pages, IRS guidance, EPA fueleconomy.gov, charging network sites, etc. We are not responsible for the privacy practices or content of those sites; review their own privacy policies before submitting information there.

Children’s privacy

This site is intended for a general audience and is not directed at children under the age of 13. We do not knowingly collect personal information from children. If you believe we may have information from a child under 13, email us and we will delete it.

Security

The site is served over HTTPS with modern transport encryption (HSTS enabled). Cloudflare provides DDoS protection and bot management. We never request passwords or financial information through the site — if any page appears to do so, it is a phishing attempt and not us.

Changes to this policy

We may update this Privacy Policy from time to time. Material changes will be reflected in the “Last updated” date at the top of the page, and where appropriate we'll note the nature of the change.

Contact

Questions about this Privacy Policy, or privacy-rights requests: hello@chargemath.app.