Privacy Policy

We collect minimal information to operate and improve this site. Specifically:

• Usage data — pages visited, time on page, referring URL, browser type, operating system, and approximate geographic region (country/city level). This is collected automatically by Google Analytics.
• Calculator inputs — your calculator inputs are processed entirely in your browser. We do not transmit or store any numbers you enter into our calculators on our servers.
• Cookies and local storage — we use cookies and browser local storage for site functionality (e.g., remembering your preferred theme) and for analytics and advertising purposes, as described below.
• IP addresses — your IP address is logged by our hosting provider and analytics services for security, fraud prevention, and approximate location detection. We do not store IP addresses in our own database.

We do not collect your name, email address, phone number, or any other directly identifying personal information unless you voluntarily contact us.

We use the following third-party services, each with their own privacy practices:

• Google Analytics — we use Google Analytics to understand how visitors use the site (pages visited, time spent, traffic sources). Google Analytics uses cookies. You can opt out via the Google Analytics Opt-out Browser Add-on.
• Google AdSense — we display advertisements served by Google AdSense. Google uses cookies to serve ads based on your prior visits to this site and other sites. You can opt out of personalized advertising at Google Ad Settings. Google's use of advertising cookies enables it and its partners to serve ads based on your visit to our site and/or other sites on the Internet.
• Hosting provider — our site is hosted on infrastructure that may log standard server access logs (IP address, request time, response code) for security and operational purposes.

We do not sell your personal information to any third party. We do not share your personal data with advertisers beyond what is done automatically through the AdSense ad-serving process.

We use the following types of cookies:

• Essential cookies — required for the site to function (e.g., theme preference, session state). These cannot be disabled without breaking site functionality.
• Analytics cookies — set by Google Analytics to measure traffic and user behavior. These are non-essential and can be blocked via browser settings or the Google opt-out tool.
• Advertising cookies — set by Google AdSense to serve relevant ads. These can be managed via Google Ad Settings or by using a browser with ad-blocking extensions.

You can control cookies through your browser settings. Note that disabling all cookies may affect site functionality. Most browsers allow you to view, manage, delete, and block cookies via their settings menus.

We use the information we collect to:

• • Operate and maintain the Online Calculator Suite website
• • Analyze how visitors use the site so we can improve calculator accuracy, add new tools, and fix bugs
• • Serve relevant advertisements through Google AdSense to fund the free service
• • Monitor for security threats and prevent abuse
• • Comply with applicable laws and legal obligations

We do not use your data to build individual user profiles, sell to data brokers, or make automated decisions that affect you legally or significantly.

We take reasonable technical and organizational measures to protect the limited data we collect. All traffic to and from this site is encrypted using HTTPS/TLS. We do not store calculator inputs on our servers — all computation happens client-side in your browser.

However, no method of transmission over the Internet is 100% secure. While we strive to use commercially acceptable means to protect your information, we cannot guarantee its absolute security.

Depending on your location, you may have the following rights regarding your personal data:

• Right to access — you may request a copy of the personal data we hold about you.
• Right to deletion — you may request that we delete personal data associated with your use of the site (note: we hold very limited personal data given that calculations run client-side).
• Right to opt out of advertising — you can opt out of personalized Google ads at any time via Google Ad Settings.
• California residents (CCPA) — you have the right to know what personal information is collected, request deletion, and opt out of the "sale" of personal information. We do not sell personal information as defined by the CCPA.
• EU/UK residents (GDPR) — you have rights to access, rectification, erasure, restriction of processing, and data portability. Our legal basis for analytics is legitimate interest; for advertising cookies, we rely on your consent where required.

To exercise any of these rights, contact us at the address below.