Privacy Policy

Effective date: April 28, 2026

Summary (the short version)

• Calculations run in your browser. We don't see or store your inputs.
• We use cookies for analytics and to remember site preferences (theme, dismissed banners, etc.).
• If you fill out the contact form, we receive your name, email, and message — and only use them to reply.
• We don't sell, rent, or trade personal information. Ever.
• We use Google Analytics 4 (anonymized) to understand which pages are useful.

1. Information we collect

1a. Information you give us

If you submit a message via our contact form, we collect the name, email address, optional subject, and message you provide. We use this information solely to read and respond to your message. We retain contact submissions for up to 24 months in case there's follow-up correspondence, after which they are deleted.

1b. Calculator inputs

Every calculator on this site runs entirely in your browser using JavaScript. The numbers you type are processed locally and never transmitted to our servers. Closing the browser tab effectively erases the calculation.

1c. Information collected automatically

When you visit any page on Zetta Calculators, our hosting and analytics infrastructure may record:

• Your IP address (used for rate limiting and abuse prevention; truncated for analytics)
• Your browser type, operating system, and screen resolution
• The page you arrived on, the page you came from (referrer), and the time of your visit
• Anonymous interaction events (clicks, scroll depth) where Google Analytics 4 records them

We don't combine this data with anything that personally identifies you.

2. Cookies and similar technologies

We use a small number of cookies:

• Session cookie (calcly_sess): a temporary cookie used to keep your form submissions safe (CSRF protection) and to maintain admin login state. Expires when you close the browser.
• Google Analytics cookies (_ga, _ga_*): used to collect aggregate, anonymized usage statistics. You can opt out of Google Analytics tracking via the Google Analytics Opt-out Browser Add-on.

You can control or disable cookies through your browser settings. Disabling the session cookie may prevent the contact form from working but will not affect calculator functionality.

3. Third parties

We work with a small number of third-party services:

• Google Analytics 4 — anonymized analytics. Google's privacy policy.
• Google Fonts — to render the typeface used on the site. Google may receive your IP address as a result. Google Fonts privacy.
• CKEditor CDN — used in the admin area only (not on public pages). Not relevant to most visitors.
• Our hosting provider — receives standard server logs as part of operating the site.

We do not run third-party advertising networks, retargeting pixels, or data-broker tags.

4. How we use your information

• To respond to inquiries you send via the contact form
• To monitor site stability, performance, and security
• To understand which calculators and articles are most useful (so we can improve them)
• To prevent abuse, spam, and brute-force attempts on the admin area
• To comply with legal obligations

We never use your information for behavioral advertising and we don't sell it to anyone.

5. Your rights

Depending on where you live, you have the following rights:

• Access — request a copy of any personal information we hold about you
• Correction — ask us to correct information you believe is inaccurate
• Deletion — request that we delete your contact submission (we can usually do this within 7 days)
• Objection / Opt-out — object to our use of analytics; you can also use a browser extension or "Do Not Track"
• Portability — request your data in a machine-readable format

To exercise any of these rights, email hello@zettacalculators.com with the subject "Privacy request." We aim to respond within 30 days.

If you're in the EU/EEA or UK (GDPR)

Our legal basis for processing analytics data is legitimate interest in understanding how the site is used. Our legal basis for processing contact form submissions is your consent, given when you click "Send." You may withdraw consent at any time by emailing us. You also have the right to lodge a complaint with your local data protection authority.

If you're in California (CCPA / CPRA)

We do not sell personal information. You have the right to request disclosure of categories of personal information collected about you, request deletion, and not be discriminated against for exercising those rights.

6. Children's privacy

This site is not directed at children under 13. We do not knowingly collect personal information from children. If you believe a child has submitted information through our contact form, please email us and we will delete it.

7. Data security

Contact form submissions are stored in a database accessible only to authenticated administrators over an encrypted (HTTPS) connection. Admin passwords are hashed with bcrypt. We do not store any payment, financial, or government-ID information about you because we never collect it.

No method of transmission over the internet is 100% secure. While we use reasonable safeguards, we cannot guarantee absolute security.

8. International transfers

Our hosting provider and our analytics provider may process data in countries outside your home jurisdiction (typically the United States). Where required by law, we rely on Standard Contractual Clauses or equivalent mechanisms.

9. Changes to this policy

If we make material changes to this policy, we will update the "Effective date" at the top and post a notice on the homepage for at least 14 days. For minor changes (typos, clarifications), we'll just update silently.

10. Contact us

Questions about this policy? Email hello@zettacalculators.com or use our contact form.