Effective: January 10, 2026 | Last updated: June 10, 2026
Plain-language summary: Our construction calculators run entirely in your browser. We do not require registration, collect your name or email, or sell personal data. If approved and enabled, Google AdSense or similar advertising services may display ads on this site and may use cookies to show relevant ads based on your browsing. Full details and opt-out options are in the advertising section below.
Overview
Welcome to CalcFormula (“we,” “our,” or “us”), available at calcformula.com. We provide free, browser-based construction calculators covering concrete, masonry, aggregates, drainage, slope, structural loads, and more — at no cost to you.
This Privacy Policy explains what information is collected when you visit our website, how it is used, and what choices you have. By using CalcFormula, you agree to the practices described here.
Information We Collect
CalcFormula automatically collects the following non-personal information when you visit:
- Browser type, version, and operating system
- Pages visited and time spent on each page
- Referring URL (the search engine or site that brought you here)
- Approximate geographic location (country or region, derived from IP address)
- Device type — desktop, tablet, or mobile
- Date and time of each page request
We do not collect your name, email address, phone number, or any values you enter into our calculators. All calculator inputs stay local to your browser session and are never transmitted to our servers.
If you contact us via our contact form, we collect only the information you voluntarily provide (such as your name and email address) for the sole purpose of responding to your message.
Log Data
Like most websites, our hosting provider automatically records standard server log data. This includes your IP address, browser user-agent string, pages requested, HTTP status codes, and timestamps. Log files are retained for a limited period for security and diagnostic purposes and are not shared with third parties except as required by law.
Cookies
A cookie is a small text file stored in your browser by websites you visit. CalcFormula uses cookies for analytics and may use cookies for advertising as described below.
Analytics Cookies
We use Google Analytics to understand how visitors use our calculators in aggregate — which tools are most popular, time on page, and traffic sources. Google Analytics sets cookies such as _ga and _gid. No personally identifiable information is collected through analytics. You can opt out by installing the Google Analytics opt-out browser add-on.
Advertising Cookies
If approved and enabled, we may display ads through Google AdSense or similar third-party advertising services. Google and its advertising partners may use cookies to serve ads based on your prior visits to this and other websites. See the advertising section below for full details and opt-out options.
Managing Cookies in Your Browser
- Google Chrome — manage cookies
- Mozilla Firefox — manage cookies
- Apple Safari — manage cookies
- Microsoft Edge — manage cookies
Disabling cookies may affect ad relevance and some site features.
Third-Party Advertising
If approved and enabled, CalcFormula may use Google AdSense, operated by Google LLC, or similar third-party advertising services to display advertisements. Ad revenue is what allows us to keep every calculator free.
Required disclosure: Third-party vendors, including Google, may use cookies to serve ads based on a user’s prior visits to CalcFormula and other websites. Users may opt out of personalized advertising as described below.
How Google Uses Data
Google may use the DoubleClick cookie and similar technologies to serve personalized advertisements based on your interests and browsing history. Google’s data practices are governed by the Google Privacy Policy.
Opt Out of Personalized Ads
- Google Ad Settings — Control which interests Google uses to show you ads, or turn off personalized ads entirely: Manage Google Ad Settings
- Network Advertising Initiative (NAI) — Opt out of interest-based advertising from many ad networks at once: NAI Opt-Out Tool
- Digital Advertising Alliance (DAA) — US visitors can manage ad preferences for participating companies: DAA Opt-Out Tool
Opting out of personalized ads does not stop ads from appearing — it means ads will no longer be tailored to your interests.
How We Use Information
- Monitoring and improving website performance and reliability
- Understanding which calculators are most useful to visitors
- Diagnosing technical issues and server errors
- Detecting and preventing fraudulent or abusive traffic
- Complying with applicable legal obligations
- Enabling third-party advertising services, if approved and enabled, to display relevant advertisements
We do not sell, rent, or trade any personally identifiable information to third parties for their marketing purposes.
Data Security
We take reasonable precautions to protect your information. While no online service is 100% secure, we strive to use commercially acceptable means to protect your data. We cannot guarantee its absolute security but are committed to responding promptly to any security incident.
Third-Party Links and Services
Our pages may link to external resources such as building codes or material references. CalcFormula has no control over those sites and is not responsible for their privacy practices. Third-party services we use or may use include:
- Google Analytics — website usage analytics — Privacy Policy
- Google AdSense — display advertising, if approved and enabled — Privacy Policy
Children’s Privacy
CalcFormula is a general-audience website and is not directed at children under 13. We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us and we will promptly delete it.
Your Rights and Choices
Depending on where you live, you may have rights to access, correct, or delete data we hold about you. Because CalcFormula collects minimal data, most requests are satisfied simply by clearing your browser cookies.
California residents (CCPA/CPRA): You have the right to know what data we collect, to request deletion, and to opt out of the sale of personal data. CalcFormula does not sell personal data. Contact us below for any requests.
EU / EEA / UK residents (GDPR / UK GDPR): Our lawful basis for processing automatically collected data is our legitimate interest in operating the site. You have the right to access, rectify, or erase your data, and to lodge a complaint with your local data protection authority.
Policy Changes
We may update this Privacy Policy to reflect changes in our practices or applicable laws. When we make material changes, we will update the “Last updated” date at the top of this page. Continued use of CalcFormula after any changes constitutes acceptance of the updated policy.
Contact Us
If you have any privacy-related questions or requests, please reach out via our Contact page. We respond to all privacy inquiries within a reasonable timeframe.